{"id":2592,"date":"2026-01-13T10:03:23","date_gmt":"2026-01-13T10:03:23","guid":{"rendered":"https:\/\/xbrele.com\/?p=2592"},"modified":"2026-04-07T15:14:43","modified_gmt":"2026-04-07T15:14:43","slug":"vacuum-contactor-rfq-template","status":"publish","type":"post","link":"https:\/\/xbrele.com\/ar\/vacuum-contactor-rfq-template\/","title":{"rendered":"\u0646\u0645\u0648\u0630\u062c \u0637\u0644\u0628 \u0639\u0631\u0636 \u0627\u0644\u0623\u0633\u0639\u0627\u0631: \u0643\u064a\u0641\u064a\u0629 \u062a\u062d\u062f\u064a\u062f \u0645\u0642\u0627\u0648\u0644 \u062a\u0641\u0631\u064a\u063a \u0627\u0644\u0647\u0648\u0627\u0621 (\u0627\u0644\u0645\u0639\u0644\u0645\u0627\u062a \u0627\u0644\u062a\u064a \u064a\u062c\u0628 \u0639\u0644\u064a\u0643 \u062a\u0636\u0645\u064a\u0646\u0647\u0627)"},"content":{"rendered":"\n<p>Generic vacuum contactor RFQs generate quotes that don\u2019t match requirements. \u201c12 kV, 400 A vacuum contactor\u201d describes perhaps 500 different product variants across manufacturers\u2014some rated for motor starting duty at 50 operations\/day, others for capacitor switching at 10,000 operations\/year, still others for transformer switching or general load breaking.<\/p>\n\n\n\n<p>The manufacturer receiving an incomplete RFQ faces two choices: quote conservatively (overspecified, expensive solution), or quote optimistically (underspecified, fails in service). Neither serves the buyer. The overspecified quote loses on price to competitors who guessed lower duty requirements. The underspecified contactor fails after 6 months when the buyer discovers their \u201cgeneral purpose\u201d contactor can\u2019t handle daily capacitor bank switching.<\/p>\n\n\n\n<p>Vacuum contactors differ from circuit breakers in critical ways that RFQs must address. Circuit breakers primarily interrupt fault currents\u2014specification focuses on short-circuit rating. Contactors primarily switch loads repeatedly\u2014specification must define operational duty, switching frequency, load type (resistive\/inductive\/capacitive), and mechanical endurance requirements. Missing these parameters guarantees wrong selection.<\/p>\n\n\n\n<p>This guide provides the complete RFQ template procurement engineers need when specifying&nbsp;<a href=\"https:\/\/xbrele.com\/vacuum-contactor\/\">vacuum contactors<\/a>&nbsp;for motor control, capacitor switching, transformer switching, and load break applications in 3.6\u201340.5 kV systems.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"essential-parameters-never-omit-these\">Essential Parameters (Never Omit These)<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1024\" height=\"765\" src=\"https:\/\/xbrele.com\/wp-content\/uploads\/2026\/01\/fig-02-rfq-checklist.webp\" alt=\"Vacuum contactor RFQ checklist of essential electrical, duty, environmental, and control parameters\" class=\"wp-image-2590\" srcset=\"https:\/\/xbrele.com\/wp-content\/uploads\/2026\/01\/fig-02-rfq-checklist.webp 1024w, https:\/\/xbrele.com\/wp-content\/uploads\/2026\/01\/fig-02-rfq-checklist-300x224.webp 300w, https:\/\/xbrele.com\/wp-content\/uploads\/2026\/01\/fig-02-rfq-checklist-768x574.webp 768w, https:\/\/xbrele.com\/wp-content\/uploads\/2026\/01\/fig-02-rfq-checklist-16x12.webp 16w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Use this RFQ checklist to avoid underspecified quotes\u2014missing duty type, switching frequency, or altitude\/IP requirements is the fastest path to wrong selection.<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1.-electrical-ratings\">1. Electrical Ratings<\/h3>\n\n\n\n<p><strong>Rated voltage (Ur)<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Specify system voltage AND rated insulation level<\/li>\n\n\n\n<li>Example: \u201c12 kV system, 17.5 kV rated insulation (Ur = 17.5 kV)\u201d<\/li>\n\n\n\n<li>Common voltages: 3.6, 7.2, 12, 17.5, 24, 36, 40.5 kV<\/li>\n\n\n\n<li><strong>Why it matters<\/strong>: Undersizing insulation causes breakdown; oversizing adds unnecessary cost<\/li>\n<\/ul>\n\n\n\n<p><strong>Rated current (Ir)<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Continuous current carrying capacity<\/li>\n\n\n\n<li>Example: \u201c400 A continuous at 40\u00b0C ambient\u201d<\/li>\n\n\n\n<li>Specify ambient temperature if >40\u00b0C<\/li>\n\n\n\n<li><strong>Why it matters<\/strong>: Contactor must carry load current continuously without overheating<\/li>\n<\/ul>\n\n\n\n<p><strong>Short-time withstand current (Icw)<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Current contactor must withstand for specified duration without damage<\/li>\n\n\n\n<li>Example: \u201c16 kA for 1 second\u201d or \u201c20 kA for 3 seconds\u201d<\/li>\n\n\n\n<li>Typically lower than circuit breaker short-circuit rating (contactors don\u2019t interrupt faults)<\/li>\n\n\n\n<li><strong>Why it matters<\/strong>: Protects contactor during faults until upstream breaker clears<\/li>\n<\/ul>\n\n\n\n<p><strong>Making and breaking capacity<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Making capacity (Icm)<\/strong>: Peak current contactor can close onto<\/li>\n\n\n\n<li><strong>Breaking capacity (Ib)<\/strong>: Current contactor can interrupt<\/li>\n\n\n\n<li>Different for resistive, inductive, capacitive loads<\/li>\n\n\n\n<li>Example: \u201cMaking: 40 kA peak, Breaking: 630 A resistive, 400 A inductive, 400 A capacitive\u201d<\/li>\n\n\n\n<li><strong>Why it matters<\/strong>: Defines maximum load current contactor can safely switch<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2.-duty-type-and-operating-frequency\">2. Duty Type and Operating Frequency<\/h3>\n\n\n\n<p><strong>Duty category<\/strong>&nbsp;(per IEC 62271-106):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>AC-1<\/strong>: Non-inductive or slightly inductive loads (resistive heating, general distribution)<\/li>\n\n\n\n<li><strong>AC-2<\/strong>: Starting of slip-ring motors<\/li>\n\n\n\n<li><strong>AC-3<\/strong>: Starting of squirrel-cage motors (most common motor duty)<\/li>\n\n\n\n<li><strong>AC-4<\/strong>: Starting\/plugging\/inching of squirrel-cage motors (severe duty)<\/li>\n\n\n\n<li><strong>AC-5a<\/strong>: Switching discharge lighting<\/li>\n\n\n\n<li><strong>AC-5b<\/strong>: Switching incandescent lighting<\/li>\n\n\n\n<li><strong>AC-6a<\/strong>: Switching transformers<\/li>\n\n\n\n<li><strong>AC-6b<\/strong>: Switching capacitor banks<\/li>\n<\/ul>\n\n\n\n<p><strong>Example specification<\/strong>: \u201cAC-3 motor starting duty, 400 A motor FLA, 2,400 A inrush (6\u00d7 FLA)\u201d<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/xbrele.com\/wp-content\/uploads\/2026\/01\/fig-01-duty-category-flowchart.webp\" alt=\"Flowchart for selecting IEC 62271-106 duty categories for vacuum contactors from AC-1 to AC-6b\" class=\"wp-image-2589\" srcset=\"https:\/\/xbrele.com\/wp-content\/uploads\/2026\/01\/fig-01-duty-category-flowchart.webp 1024w, https:\/\/xbrele.com\/wp-content\/uploads\/2026\/01\/fig-01-duty-category-flowchart-300x168.webp 300w, https:\/\/xbrele.com\/wp-content\/uploads\/2026\/01\/fig-01-duty-category-flowchart-768x429.webp 768w, https:\/\/xbrele.com\/wp-content\/uploads\/2026\/01\/fig-01-duty-category-flowchart-18x10.webp 18w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Duty category (AC-1 to AC-6b) is the most critical RFQ input\u2014each category defines switching stress, endurance needs, and pricing.<\/figcaption><\/figure>\n\n\n\n<p><strong>Operations per day\/year<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>How many close-open cycles?<\/li>\n\n\n\n<li>Example: \u201c10 operations\/day, 3,650 operations\/year\u201d (daily start-stop)<\/li>\n\n\n\n<li>OR: \u201c2 operations\/day, 730 operations\/year\u201d (standby duty)<\/li>\n\n\n\n<li><strong>Why it matters<\/strong>: Determines mechanical and electrical endurance requirements<\/li>\n<\/ul>\n\n\n\n<p><strong>Load power factor<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Inductive loads: specify power factor (e.g., \u201c0.85 lagging for motor load\u201d)<\/li>\n\n\n\n<li>Capacitive loads: specify capacitance (e.g., \u201c3 \u00d7 50 kVAR capacitor bank\u201d)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3.-application-specific-requirements\">3. Application-Specific Requirements<\/h3>\n\n\n\n<p><strong>Motor starting<\/strong>&nbsp;(AC-3\/AC-4):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Motor rated power (kW or HP)<\/li>\n\n\n\n<li>Motor full-load current (FLA)<\/li>\n\n\n\n<li>Starting current (typically 5\u20138\u00d7 FLA for squirrel-cage)<\/li>\n\n\n\n<li>Starting method: DOL (direct-on-line), star-delta, soft starter, VFD<\/li>\n\n\n\n<li>Number of starts per hour<\/li>\n<\/ul>\n\n\n\n<p><strong>Capacitor switching<\/strong>&nbsp;(AC-6b):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Total capacitor bank size (kVAR)<\/li>\n\n\n\n<li>Individual capacitor unit size<\/li>\n\n\n\n<li>Back-to-back switching? (existing energized capacitors on bus)<\/li>\n\n\n\n<li>Detuning reactor present? (specify inductance)<\/li>\n\n\n\n<li>Required mechanical endurance (capacitor duty demands high endurance\u201450,000+ ops)<\/li>\n<\/ul>\n\n\n\n<p><strong>Transformer switching<\/strong>&nbsp;(AC-6a):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Transformer rated power (kVA or MVA)<\/li>\n\n\n\n<li>No-load magnetizing current<\/li>\n\n\n\n<li>Inrush current magnitude and duration<\/li>\n\n\n\n<li>Switching frequency (daily, weekly, emergency only?)<\/li>\n<\/ul>\n\n\n\n<p><strong>General load break<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Load type (resistive, inductive, mixed)<\/li>\n\n\n\n<li>Maximum breaking current<\/li>\n\n\n\n<li>Power factor<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"environmental-and-installation-parameters\">Environmental and Installation Parameters<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4.-environmental-conditions\">4. Environmental Conditions<\/h3>\n\n\n\n<p><strong>Ambient temperature<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Operating range: \u201c\u221225\u00b0C to +45\u00b0C\u201d (specify actual site conditions)<\/li>\n\n\n\n<li>Storage range: \u201c\u221240\u00b0C to +70\u00b0C\u201d<\/li>\n\n\n\n<li>Altitude: \u201cInstalled at 2,500 m elevation\u201d (requires derating or altitude correction)<\/li>\n<\/ul>\n\n\n\n<p><strong>Enclosure protection<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IP rating: IP54 (indoor clean), IP65 (outdoor\/dusty), IP66 (washdown)<\/li>\n\n\n\n<li>NEMA rating if applicable: NEMA 3R (outdoor), NEMA 4X (corrosive)<\/li>\n<\/ul>\n\n\n\n<p><strong>Atmospheric conditions<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Humidity: \u201c95% RH non-condensing\u201d or \u201ctropical climate\u201d<\/li>\n\n\n\n<li>Contamination: \u201cHeavy dust\u201d or \u201cCorrosive atmosphere (sulfur, salt spray)\u201d<\/li>\n\n\n\n<li>Vibration\/seismic: \u201cSeismic Zone 4 per IEC 60068-2-6\u201d if applicable<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"5.-physical-and-mechanical-requirements\">5. Physical and Mechanical Requirements<\/h3>\n\n\n\n<p><strong>Mounting<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fixed or withdrawable\/drawable<\/li>\n\n\n\n<li>Panel mounting or floor standing<\/li>\n\n\n\n<li>Preferred: \u201cWithdrawable design for easy maintenance without panel dismantling\u201d<\/li>\n<\/ul>\n\n\n\n<p><strong>Dimensions and weight<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Space constraints: \u201cMaximum height 2,000 mm\u201d if space-limited<\/li>\n\n\n\n<li>Weight limit if crane capacity restricted<\/li>\n<\/ul>\n\n\n\n<p><strong>Operating mechanism<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Spring-operated, magnetic actuator, manual<\/li>\n\n\n\n<li>Preference for maintenance-free operation: \u201cMagnetic actuator preferred (no lubrication)\u201d<\/li>\n<\/ul>\n\n\n\n<p><strong>Control voltage<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DC: 110 VDC, 125 VDC, 220 VDC<\/li>\n\n\n\n<li>AC: 110 VAC, 220 VAC, 380 VAC<\/li>\n\n\n\n<li>Specify: \u201c125 VDC closing coil, 125 VDC trip coil, battery-backed supply\u201d<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"standards-testing-and-documentation\">Standards, Testing, and Documentation<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"6.-applicable-standards\">6. Applicable Standards<\/h3>\n\n\n\n<p><strong>Design and testing standards<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IEC 62271-106 (AC contactors for voltages above 1 kV)<\/li>\n\n\n\n<li>IEEE C37.012 (Application Guide for Capacitance Current Switching)<\/li>\n\n\n\n<li>IEC 60470 (for capacitor switching applications)<\/li>\n\n\n\n<li>Others: UL, CSA, GB if required for specific markets<\/li>\n<\/ul>\n\n\n\n<p><strong>Specify<\/strong>: \u201cContactor shall comply with IEC 62271-106, with type test certificates provided.\u201d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"7.-type-testing-and-quality-assurance\">7. Type Testing and Quality Assurance<\/h3>\n\n\n\n<p><strong>Type test reports required<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dielectric tests (power frequency withstand, lightning impulse)<\/li>\n\n\n\n<li>Temperature rise tests<\/li>\n\n\n\n<li>Mechanical endurance tests<\/li>\n\n\n\n<li>Making and breaking capacity tests<\/li>\n\n\n\n<li>Short-circuit withstand tests<\/li>\n<\/ul>\n\n\n\n<p><strong>Routine tests required<\/strong>&nbsp;(for each delivered unit):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dielectric tests across open contacts<\/li>\n\n\n\n<li>Auxiliary circuit tests<\/li>\n\n\n\n<li>Mechanical operation tests<\/li>\n\n\n\n<li>Contact resistance measurement<\/li>\n<\/ul>\n\n\n\n<p><strong>Quality certifications<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ISO 9001 (quality management)<\/li>\n\n\n\n<li>ISO 14001 (environmental management) if environmentally sensitive site<\/li>\n\n\n\n<li>Factory inspection: \u201cBuyer reserves right to witness factory acceptance test (FAT)\u201d<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"accessories-and-options\">Accessories and Options<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"8.-auxiliary-contacts\">8. Auxiliary Contacts<\/h3>\n\n\n\n<p><strong>Number and type<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Example: \u201c4 NO + 4 NC auxiliary contacts, rated 10 A, 250 VAC\/DC\u201d<\/li>\n\n\n\n<li>For signaling, interlocking, remote indication<\/li>\n<\/ul>\n\n\n\n<p><strong>Position indication<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mechanical indicator on contactor (visible through panel window)<\/li>\n\n\n\n<li>Electrical position indication (auxiliary contacts for SCADA)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"9.-interlocks\">9. Interlocks<\/h3>\n\n\n\n<p><strong>Mechanical interlocks<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Prevent simultaneous closing of two contactors<\/li>\n\n\n\n<li>Example: \u201cMechanical interlock between Main and Bypass contactors\u201d<\/li>\n<\/ul>\n\n\n\n<p><strong>Electrical interlocks<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Undervoltage release (trips contactor if control voltage lost)<\/li>\n\n\n\n<li>Shunt trip (remote trip capability)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"10.-protection-and-monitoring\">10. Protection and Monitoring<\/h3>\n\n\n\n<p><strong>Built-in protection<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Overload protection (thermal or electronic)<\/li>\n\n\n\n<li>Phase unbalance protection<\/li>\n\n\n\n<li>Ground fault protection<\/li>\n<\/ul>\n\n\n\n<p><strong>Monitoring capabilities<\/strong>&nbsp;(for smart contactors):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Operation counter (tracks number of operations for maintenance scheduling)<\/li>\n\n\n\n<li>Temperature sensors<\/li>\n\n\n\n<li>Contact wear indication<\/li>\n\n\n\n<li>Communication protocol: Modbus RTU, Profibus, IEC 61850<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"commercial-and-delivery-requirements\">Commercial and Delivery Requirements<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"11.-quantity-and-delivery\">11. Quantity and Delivery<\/h3>\n\n\n\n<p><strong>Quantity<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Example: \u201c4 units for initial order, potential for 20 additional units over 3 years\u201d<\/li>\n\n\n\n<li>Helps manufacturer assess volume pricing, spare parts strategy<\/li>\n<\/ul>\n\n\n\n<p><strong>Delivery schedule<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u201cDelivery required by [date]\u201d<\/li>\n\n\n\n<li>\u201cStaged delivery acceptable: 2 units by [date 1], 2 units by [date 2]\u201d<\/li>\n<\/ul>\n\n\n\n<p><strong>Packaging<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u201cSuitable for international shipping, protected from moisture and shock\u201d<\/li>\n\n\n\n<li>\u201cDelivered with all mounting hardware, installation\/operation manuals\u201d<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"12.-spare-parts-and-after-sales-support\">12. Spare Parts and After-Sales Support<\/h3>\n\n\n\n<p><strong>Initial spare parts<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u201cQuote shall include: 1 set of main contacts, 1 set of auxiliary contacts, 1 operating mechanism maintenance kit\u201d<\/li>\n<\/ul>\n\n\n\n<p><strong>Long-term availability<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u201cManufacturer shall guarantee spare parts availability for minimum 15 years after purchase\u201d<\/li>\n<\/ul>\n\n\n\n<p><strong>Technical support<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u201cCommissioning support required: on-site presence for initial energization\u201d<\/li>\n\n\n\n<li>\u201cTraining required: 1-day hands-on training for maintenance personnel\u201d<\/li>\n\n\n\n<li>\u201cLocal service center within [region]: Yes\/No, specify location and response time\u201d<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"13.-warranty-and-guarantees\">13. Warranty and Guarantees<\/h3>\n\n\n\n<p><strong>Standard warranty<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u201cMinimum 24 months from commissioning or 30 months from delivery, whichever is earlier\u201d<\/li>\n<\/ul>\n\n\n\n<p><strong>Performance guarantees<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u201cMechanical endurance: Minimum 50,000 operations for capacitor switching duty\u201d<\/li>\n\n\n\n<li>\u201cElectrical endurance: Minimum 10,000 operations at rated breaking current (AC-3 duty)\u201d<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"complete-rfq-template\">Complete RFQ Template<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>VACUUM CONTACTOR REQUEST FOR QUOTATION\n\nProject: ________________________  Date: ____________\nBuyer: __________________________  Contact: ___________\n\n1. ELECTRICAL RATINGS\n   - Rated voltage (Ur): ______ kV\n   - Rated current (Ir): ______ A continuous at ____\u00b0C ambient\n   - Short-time withstand (Icw): ______ kA for ____ seconds\n   - Making capacity (Icm): ______ kA peak\n   - Breaking capacity (Ib): ______ A (specify resistive\/inductive\/capacitive)\n   - Rated frequency: ______ Hz\n\n2. DUTY TYPE AND APPLICATION\n   - Duty category per IEC 62271-106: AC-___\n   - Load description: _______________________\n   - Rated operational current: ______ A\n   - Operations per day: ______  Operations per year: ______\n   - Load power factor: ______ (if applicable)\n\n   &#91;If motor starting]\n   - Motor power: ______ kW\/HP\n   - Motor FLA: ______ A\n   - Starting current: ______ A (____\u00d7 FLA)\n   - Starting method: DOL \/ Star-Delta \/ Soft Start \/ VFD\n\n   &#91;If capacitor switching]\n   - Capacitor bank size: ______ kVAR\n   - Number of units: ______\n   - Detuning reactor: Yes\/No, if yes: ______ mH\n   - Back-to-back switching: Yes\/No\n   - Required mechanical endurance: ______ operations minimum\n\n   &#91;If transformer switching]\n   - Transformer rating: ______ kVA\/MVA\n   - No-load current: ______ A\n   - Inrush current: ______ A for ______ ms\n\n3. ENVIRONMENTAL CONDITIONS\n   - Operating temperature: ____\u00b0C to ____\u00b0C\n   - Storage temperature: ____\u00b0C to ____\u00b0C\n   - Altitude: ______ m above sea level\n   - Humidity: ______ % RH, condensing\/non-condensing\n   - Contamination level: Clean \/ Moderate Dust \/ Heavy Dust \/ Corrosive\n   - IP rating required: IP____\n   - Vibration\/seismic requirements: ________________\n\n4. MECHANICAL &amp; INSTALLATION\n   - Mounting: Fixed \/ Withdrawable \/ Drawable\n   - Installation location: Indoor \/ Outdoor \/ Semi-outdoor\n   - Operating mechanism: Spring \/ Magnetic Actuator \/ Manual \/ Other\n   - Space constraints (if any): W____mm \u00d7 H____mm \u00d7 D____mm\n   - Maximum weight (if limited): ______ kg\n\n5. CONTROL &amp; AUXILIARY\n   - Closing coil voltage: ______ VDC\/VAC\n   - Trip coil voltage: ______ VDC\/VAC\n   - Auxiliary contacts required: ____ NO + ____ NC\n   - Position indication: Mechanical \/ Electrical \/ Both\n   - Mechanical interlocks: Yes\/No, describe: __________\n   - Electrical interlocks: Undervoltage \/ Shunt trip \/ Other\n   - Operation counter: Yes\/No\n   - Communication protocol (if smart contactor): _______\n\n6. STANDARDS &amp; TESTING\n   - Design standard: IEC 62271-106 \/ IEEE C37.012 \/ Other: ______\n   - Type test certificates required: Yes\/No\n   - Routine test required: Per IEC 62271-106 \/ Custom: ______\n   - Factory acceptance test (FAT): Required \/ Optional\n   - Quality certifications: ISO 9001 \/ ISO 14001 \/ Other: ______\n\n7. COMMERCIAL REQUIREMENTS\n   - Quantity: ______ units (initial), ______ potential future\n   - Delivery required by: __________\n   - Packaging: International shipping \/ Domestic \/ Special: ______\n   - Initial spare parts required: Yes\/No, specify: __________\n   - Spare parts availability guarantee: ______ years minimum\n   - Commissioning support: Required \/ Not required\n   - Training: Required \/ Not required (specify duration: ____)\n   - Local service center: Required \/ Preferred \/ Not critical\n   - Warranty: Minimum ______ months\n\n8. DOCUMENTATION REQUIRED WITH QUOTE\n   &#91; ] Detailed technical datasheet\n   &#91; ] Dimensional drawings (PDF + CAD)\n   &#91; ] Type test certificates\n   &#91; ] Quality certifications (ISO 9001, etc.)\n   &#91; ] Operation and maintenance manuals (draft or sample)\n   &#91; ] Spare parts list with pricing\n   &#91; ] Local service center locations and contact details\n   &#91; ] Reference installations (similar application, provide contact)\n   &#91; ] Delivery schedule and lead time\n   &#91; ] Itemized pricing (base unit, options, spare parts, services)\n\n9. SPECIAL REQUIREMENTS OR NOTES\n   ________________________________________________\n   ________________________________________________\n\n10. EVALUATION CRITERIA\n   Technical compliance: ____%\n   Price: ____%\n   Delivery time: ____%\n   After-sales support: ____%\n   Other: ________________: ____%\n\nSUBMISSION DEADLINE: ____________\nSubmit to: ________________________\nContact for clarifications: ____________ (email\/phone)\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"common-rfq-mistakes-and-how-to-avoid-them\">Common RFQ Mistakes and How to Avoid Them<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/xbrele.com\/wp-content\/uploads\/2026\/01\/fig-03-common-mistakes.webp\" alt=\"Common vacuum contactor RFQ mistakes versus correct specification inputs\" class=\"wp-image-2591\" srcset=\"https:\/\/xbrele.com\/wp-content\/uploads\/2026\/01\/fig-03-common-mistakes.webp 1024w, https:\/\/xbrele.com\/wp-content\/uploads\/2026\/01\/fig-03-common-mistakes-300x168.webp 300w, https:\/\/xbrele.com\/wp-content\/uploads\/2026\/01\/fig-03-common-mistakes-768x429.webp 768w, https:\/\/xbrele.com\/wp-content\/uploads\/2026\/01\/fig-03-common-mistakes-18x10.webp 18w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Most RFQ failures come from missing duty category, switching frequency, and site conditions\u2014fixing these fields produces comparable quotes and reliable service life.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Mistake<\/th><th>Consequence<\/th><th>Solution<\/th><\/tr><\/thead><tbody><tr><td><strong>Omitting duty type<\/strong><\/td><td>Manufacturer guesses\u2014either overpriced or underspec<\/td><td>Always specify AC-1 through AC-6b category<\/td><\/tr><tr><td><strong>Specifying only voltage\/current<\/strong><\/td><td>500+ variants match; quote doesn\u2019t fit actual need<\/td><td>Include application, operations\/year, load type<\/td><\/tr><tr><td><strong>No altitude specified<\/strong><\/td><td>Contactor derated at site elevation, overheats or fails dielectrically<\/td><td>State actual installation altitude (&gt;1,000 m critical)<\/td><\/tr><tr><td><strong>\u201cCapacitor switching\u201d without capacitor size<\/strong><\/td><td>Manufacturer can\u2019t determine inrush\/making capacity<\/td><td>Specify total kVAR, number of units, detuning reactor<\/td><\/tr><tr><td><strong>\u201cSimilar to [competitor model]\u201d<\/strong><\/td><td>Lazy specification leads to non-comparable quotes<\/td><td>Define requirements independently, not by competitor product<\/td><\/tr><tr><td><strong>No mechanical endurance requirement<\/strong><\/td><td>Standard 10,000-op contactor fails in high-frequency application<\/td><td>State operations\/year; capacitor duty needs 50,000+<\/td><\/tr><tr><td><strong>Forgetting control voltage<\/strong><\/td><td>Quoted contactor has 220 VDC coil, your system is 125 VDC<\/td><td>Specify both closing and trip coil voltages<\/td><\/tr><tr><td><strong>No spare parts\/support discussion<\/strong><\/td><td>Contactor works great but manufacturer has no local support<\/td><td>Require local service center, spare parts availability guarantee<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"key-takeaways\">Key Takeaways<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Complete RFQ must specify 4 critical categories: electrical ratings (voltage, current, making\/breaking capacity), duty type (AC-1 through AC-6b per IEC 62271-106 with operations\/year), environmental conditions (temperature, altitude, IP rating), and application details (motor FLA\/inrush, capacitor kVAR, or transformer MVA)<\/li>\n\n\n\n<li>Duty category selection drives cost and reliability\u2014AC-3 motor starting contactor costs 30\u201350% less than AC-6b capacitor switching equivalent due to different mechanical endurance requirements (10,000 vs 50,000+ operations)<\/li>\n\n\n\n<li>Altitude >1,000 m requires explicit specification\u2014\u6bcf1,000 m derating factor ~10%, so 3,000 m installation needs contactor rated 1.3\u00d7 nominal voltage or accept 23% current derating<\/li>\n\n\n\n<li>Capacitor switching RFQs must include total kVAR, individual unit size, detuning reactor presence, and back-to-back switching requirement\u2014missing any parameter prevents accurate inrush current calculation<\/li>\n\n\n\n<li>Mechanical endurance requirement separates appropriate quotes from failures\u2014capacitor\/motor frequent switching needs 30,000\u2013100,000 op rating; transformer\/feeder occasional switching accepts 10,000 ops<\/li>\n\n\n\n<li>After-sales support specification (local service, spare parts 15-year availability, commissioning support) belongs in RFQ not post-purchase discussion\u2014avoids surprises when manufacturer has no local presence<\/li>\n\n\n\n<li>Documentation requirements (type test certificates, FAT witness, CAD drawings) must be explicit\u2014\u201cstandard documentation\u201d means different things to different manufacturers<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>External Reference:<\/strong>&nbsp;<a href=\"https:\/\/webstore.iec.ch\/publication\/6709\" target=\"_blank\" rel=\"noopener\">IEC 62271-106<\/a>&nbsp;\u2014 IEC 62271-106 standard for AC contactors<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"frequently-asked-questions\">Frequently Asked Questions<\/h2>\n\n\n\n<p><strong>Q1: What\u2019s the difference between making capacity and breaking capacity?<\/strong><br>A: Making capacity (Icm) is peak current contactor can close onto (typically 2.5\u00d7 rated short-circuit withstand for motor inrush\/capacitor energization). Breaking capacity (Ib) is RMS current contactor can safely interrupt. Example: 12 kV contactor might have 40 kA making, 16 kA short-time withstand, but only 400 A breaking capacity\u2014designed to close onto high inrush but not interrupt faults.<\/p>\n\n\n\n<p><strong>Q2: How do I determine required mechanical endurance for my application?<\/strong><br>A: Calculate total operations over desired life: (operations\/day \u00d7 365 \u00d7 years). Example: Motor started 3\u00d7\/day for 20-year life = 3 \u00d7 365 \u00d7 20 = 21,900 operations\u2014specify 30,000+ mechanical endurance for safety margin. Capacitor switching (daily): 365 \u00d7 20 = 7,300 minimum, specify 50,000+ due to severe electrical stress.<\/p>\n\n\n\n<p><strong>Q3: Can I specify \u201cequivalent to [competitor model]\u201d instead of detailed requirements?<\/strong><br>A: Not recommended\u2014creates legal ambiguity and prevents apple-to-apple comparison. Different manufacturers interpret \u201cequivalent\u201d differently. Better: obtain competitor datasheet, extract key specifications, include those as requirements. This allows multiple manufacturers to quote fairly.<\/p>\n\n\n\n<p><strong>Q4: What altitude correction factor should I apply?<\/strong><br>A: Per IEC 60694, correction factor Ka = 1 + 0.012(H &#8211; 1000) where H is altitude in meters. At 2,500 m: Ka = 1 + 0.012(2,500 &#8211; 1,000) = 1.18. Either specify contactor rated 1.18\u00d7 nominal voltage or accept 1\/1.18 = 0.85 (15% current derating). Always state site altitude in RFQ.<\/p>\n\n\n\n<p><strong>Q5: How specific should I be about capacitor bank configuration?<\/strong><br>A: Very specific\u2014manufacturers need: total bank kVAR, number of individual capacitor units, connection (wye\/delta), detuning reactor value (if present), existing energized capacitors on bus (back-to-back switching), and switching frequency. Missing any parameter forces manufacturer to guess inrush current, leading to over\/under-specification.<\/p>\n\n\n\n<p><strong>Q6: Should I request FAT (factory acceptance test) for all contactor purchases?<\/strong><br>A: For critical applications (capacitor switching, high-duty motor starting, expensive equipment protection): Yes\u2014FAT confirms performance before shipment. For standard applications with proven manufacturer track record: Optional (adds cost and delivery time). Always require FAT for custom\/first-time configurations.<\/p>\n\n\n\n<p><strong>Q7: What warranty period should I specify for vacuum contactors?<\/strong><br>A: Standard: 24 months from commissioning or 30 months from delivery. Capacitor switching duty: Request extended warranty (36 months) due to higher electrical stress. Also specify mechanical\/electrical endurance guarantees: \u201cMinimum 50,000 mechanical operations, 10,000 electrical operations at rated current\u201d for capacitor duty.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"related-reading-and-selection-resources\">Related Reading and Selection Resources<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/xbrele.com\/vacuum-contactor\/ckg-vacuum-contactor\/\">CKG Vacuum Contactor<\/a> ? practical checks, limits, and commissioning notes<\/li>\n\n\n<li><a href=\"https:\/\/xbrele.com\/vacuum-contactor\/high-voltage-vacuum-contactor-lcz-series\/\">Lcz Vacuum Contactor<\/a> ? selection logic and failure-prevention details<\/li>\n\n\n<li><a href=\"https:\/\/xbrele.com\/vacuum-contactor\/jcz-vacuum-contactor\/\">jcz vacuum contactor<\/a> ? field troubleshooting patterns and acceptance criteria<\/li>\n<\/ul>\n\n","protected":false},"excerpt":{"rendered":"<p>Generic vacuum contactor RFQs generate quotes that don\u2019t match requirements. \u201c12 kV, 400 A vacuum contactor\u201d describes perhaps 500 different product variants across manufacturers\u2014some rated for motor starting duty at 50 operations\/day, others for capacitor switching at 10,000 operations\/year, still others for transformer switching or general load breaking. The manufacturer receiving an incomplete RFQ faces [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":2588,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[25],"tags":[],"class_list":["post-2592","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vaccum-contactor-knowledge"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/xbrele.com\/ar\/wp-json\/wp\/v2\/posts\/2592","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xbrele.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xbrele.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xbrele.com\/ar\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/xbrele.com\/ar\/wp-json\/wp\/v2\/comments?post=2592"}],"version-history":[{"count":4,"href":"https:\/\/xbrele.com\/ar\/wp-json\/wp\/v2\/posts\/2592\/revisions"}],"predecessor-version":[{"id":3654,"href":"https:\/\/xbrele.com\/ar\/wp-json\/wp\/v2\/posts\/2592\/revisions\/3654"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xbrele.com\/ar\/wp-json\/wp\/v2\/media\/2588"}],"wp:attachment":[{"href":"https:\/\/xbrele.com\/ar\/wp-json\/wp\/v2\/media?parent=2592"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xbrele.com\/ar\/wp-json\/wp\/v2\/categories?post=2592"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xbrele.com\/ar\/wp-json\/wp\/v2\/tags?post=2592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}