قم بتنزيل كتالوج منتجاتنا لعام 2025 للحصول على رسومات تفصيلية ومعايير تقنية لجميع مكونات المفاتيح الكهربائية.
احصل على الكتالوج قم بتنزيل كتالوج منتجاتنا لعام 2025 للحصول على رسومات تفصيلية ومعايير تقنية لجميع مكونات المفاتيح الكهربائية.
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A VCB RFQ data sheet should not treat the control circuit as a generic accessory list. For medium-voltage vacuum circuit breakers, the closing coil, trip coils, auxiliary contacts, anti-pumping function, charging motor, blocking contacts, racking interlocks, and switchgear-side interlocks determine whether the breaker can be safely closed, opened, tested, racked, and integrated into the panel logic.
For a clear **vcb rfq control circuit interlocking** specification, the buyer should require suppliers to identify every control-circuit device, every permissive or blocking contact, and every interface between the breaker and the switchgear. The RFQ should not assume that all VCB brands use identical terminal names or interlock arrangements. ABB documentation for VD4X and SecoVac breakers, Schneider guidance for EvoPacT electrical auxiliaries, and Siemens VCB documentation all show that control and interlocking functions are divided across breaker-mounted auxiliaries, releases, motors, anti-pumping circuits, mechanical locks, truck or racking interfaces, and switchgear-side position logic.
The RFQ data sheet should require a dedicated control-circuit schedule for the VCB. At minimum, the supplier should state whether each item is included, how it is identified in the schematic, and where it terminates.
| RFQ field | What the supplier must declare | لماذا هذا مهم |
|---|---|---|
| Closing release / closing coil | Device tag, terminal references, operating command path, and blocking contacts in series | ABB VD4X and SecoVac documentation identify closing releases or closing coils as central control-circuit elements. |
| Shunt trip release / trip coil | Quantity, device tags, terminal references, and trip command path | ABB VD4X distinguishes shunt releases, while SecoVac describes trip coils in the control circuit. |
| Anti-pumping relay or anti-pump function | Device tag, logic location, and interaction with close command | ABB VD4X and SecoVac reference anti-pumping relays; Schneider warns that wiring choices can defeat mechanical anti-pump behavior. |
| Charging motor | Motor terminals, supply path, protection or control contacts, and spring-charged indication interface | ABB VD4X and SecoVac identify the charging motor as part of the breaker control circuit. |
| Mechanism auxiliary contacts | Contact quantity, normal state, function, and terminal references | ABB VD4X distinguishes mechanism auxiliary contacts; SecoVac references the 52 auxiliary switch. |
| Blocking-magnet contacts | Whether used, circuit position, and controlled condition | ABB VD4X distinguishes blocking-magnet contacts in the breaker control circuit. |
| Push-button-interlocking auxiliary contacts | Whether supplied, contact function, and interaction with local close/open push buttons | ABB VD4X identifies push-button-interlocking auxiliary contacts separately from other auxiliary contacts. |
| Close-block contact | Contact tag, operating condition, and whether it blocks electrical closing | ABB SecoVac describes a close-block contact in the closing/interlocking circuit. |
| Truck, racking, or withdrawable-position interlocks | Test/service/disconnect-related contacts or mechanical interfaces | ABB SecoVac describes optional truck interlock components and racking-related positive and negative trip interlocks. |
| Switchgear-side interlocks | Disconnector, earthing-switch, or panel interlock interface | Siemens documents VCB interlocking through switchgear-side disconnector or earthing-switch mechanisms. |
The RFQ should ask for the supplier’s actual schematic rather than only a brochure statement such as “standard control circuit.” The data sheet should also require the supplier to mark which contacts are breaker-mounted, which are truck-mounted, and which are switchgear-mounted.
The closing circuit is the part of the VCB control scheme where RFQ ambiguity most often creates procurement risk. ABB SecoVac documentation describes a closing/interlocking circuit including a closing coil, anti-pumping relay, close-block contact, 52 auxiliary switch, charging motor, trip coils, and optional block and truck interlock components. ABB VD4X documentation also distinguishes closing release, auxiliary contacts, blocking-magnet contacts, push-button-interlocking auxiliary contacts, charging motor, shunt releases, and anti-pumping relay. Review the vacuum circuit breaker options as a practical starting point for matching the required breaker format to the application.
The RFQ should therefore include these closing-circuit fields:
| Closing-circuit field | Required RFQ entry |
|---|---|
| Electrical close command source | Local, remote, or both, as required by the project |
| Closing release / coil tag | Supplier’s exact device code and schematic reference |
| Close command contact path | All contacts in series with the close command, including permissive and blocking contacts |
| Anti-pumping device | Relay or mechanism-based function, with schematic location |
| Close-block contact | Included or not included, with operating condition |
| Spring-charged permissive | Whether closing depends on stored-energy or charged-spring indication |
| Auxiliary switch interaction | How 52 or mechanism contacts are used in the closing path |
| Push-button interlocking | Whether local push-button interlocking contacts are included |
| واجهة المحطة الطرفية | Terminal numbers for customer close command wiring |
| Supplier drawing requirement | Complete elementary diagram and terminal diagram to be submitted with the offer |
The data sheet should avoid specifying an undocumented circuit topology. Instead, it should require the supplier to show the actual topology and identify every permissive or blocking element.
Anti-pumping is not just a relay name on a parts list. It is a functional requirement intended to prevent repeated closing attempts under a maintained close command after a trip or failed close sequence. ABB VD4X and SecoVac documentation reference anti-pumping relays in the breaker control circuit, while Schneider EvoPacT guidance adds an important wiring caution: the breaker’s own auxiliary contacts must not be wired in series with the closing release and close contact in a way that defeats the mechanical anti-pump system. Schneider distinguishes that unsafe arrangement from interlocking through auxiliary contacts of other breakers. The VCB ratings and selection guide helps translate the system duty into the breaker data that must be confirmed.
For the RFQ, this means the buyer should include a specific anti-pumping declaration instead of assuming it is standard.
| Anti-pumping RFQ field | Required declaration |
|---|---|
| Anti-pumping method | Supplier to identify the relay, mechanism function, or combined arrangement used |
| Anti-pumping schematic location | Supplier to show the function in the control drawing |
| Maintained close command behavior | Supplier to describe how repeated closing is prevented |
| Own auxiliary contact restriction | Supplier to confirm that the breaker’s own auxiliary contacts are not applied in a manner that defeats anti-pumping |
| Other-breaker interlocking | Supplier to identify any interlocking through auxiliary contacts of other breakers, if required by the project |
| Test reference | Supplier to include anti-pumping verification in the FAT or functional test procedure, if requested |
This is a mandatory **vcb rfq control circuit interlocking** field because a formally included anti-pump relay does not, by itself, prove that the final wiring preserves the intended anti-pump behavior.
Trip circuits must be documented separately from the closing circuit. ABB VD4X documentation distinguishes shunt releases, while ABB SecoVac documentation describes trip coils in the breaker control circuit. SecoVac also describes racking-related positive and negative trip interlocks, which means a withdrawable VCB RFQ should not treat racking as only a mechanical panel feature.
The RFQ should request these fields:
| Trip and racking field | Required RFQ entry |
|---|---|
| Trip coil quantity | Supplier to state quantity and device tags |
| Trip coil terminal references | Supplier to provide terminal numbers and schematic references |
| Shunt release identification | Supplier to identify shunt release devices where applicable |
| Electrical trip command sources | Local, remote, protection relay, or other project-defined command sources |
| Racking-related trip interlock | Supplier to state whether positive or negative trip interlocks are included |
| Truck interlock components | Supplier to identify optional block or truck interlock components if applicable |
| Position dependency | Supplier to state whether trip or close permissives depend on service, test, or disconnected position |
| إجراءات الاختبار | Supplier to include functional checks for trip and racking interlock behavior if requested |
The RFQ should not impose unverified trip-coil quantities or terminal numbers. It should require the supplier to declare them and provide the actual elementary and terminal drawings.
Siemens documentation describes both electrical and mechanical interlocks for VCBs, including switchgear-side disconnector or earthing-switch interlocking through magnetic lockout mechanisms and position-dependent prevention of mechanical and electrical closing. This evidence is important because an RFQ that asks only for “electrical interlock included” may miss the boundary between the VCB and the switchgear. For witness planning and records, align the evidence with the VCB factory and site acceptance checklist.
The data sheet should divide interlocks into breaker-mounted, truck-mounted, and switchgear-mounted functions.
| Interlock category | Mandatory RFQ fields |
|---|---|
| Breaker-mounted electrical interlocks | Blocking magnets, close-block contacts, push-button interlocking contacts, and auxiliary contacts |
| Breaker-mounted mechanical interlocks | Mechanical close prevention, local push-button blocking, or mechanism-based lockout functions |
| Truck or racking interlocks | Position contacts, truck interlock components, and racking-related trip interlocks |
| Switchgear-side interlocks | Disconnector, earthing-switch, panel door, or magnetic lockout interfaces where required |
| Position-dependent close prevention | Supplier to state which positions allow or prevent mechanical and electrical closing |
| Terminal responsibility | Supplier to define whether contacts terminate on the breaker, truck, or switchgear terminal block |
| Coordination responsibility | Supplier to identify which interlocks are included in the VCB supply and which are by the panel builder |
For VCB procurement, the safest approach is to require a completed interlock matrix. The supplier should mark each condition as close-permissive, close-blocking, trip-initiating, indication-only, or not applicable.
Auxiliary contacts are not interchangeable unless their function, normal state, and timing are defined. ABB VD4X documentation distinguishes mechanism auxiliary contacts, blocking-magnet contacts, and push-button-interlocking auxiliary contacts. ABB SecoVac documentation references the 52 auxiliary switch. Schneider guidance also highlights that the breaker’s own auxiliary contacts require careful treatment when used around the closing release and close contact. The ABB VD4X instruction manual is the primary source for the product-specific requirement stated here.
The RFQ should require a contact schedule with these fields:
| Auxiliary-contact field | Required RFQ entry |
|---|---|
| Contact identity | Supplier’s tag, such as mechanism auxiliary, 52 auxiliary switch, blocking contact, or push-button interlock contact |
| الوظيفة | Indication, permissive, blocking, anti-pumping-related, or interlocking-related |
| Normal state definition | State to be defined against breaker open/closed and, where relevant, truck position |
| Quantity available | Number of spare and used contacts to be declared by supplier |
| Contact location | Breaker, mechanism, truck, or switchgear |
| Wiring destination | Internal circuit, customer terminal, or switchgear interface |
| Restrictions | Supplier to state any restrictions on using the contact in the close circuit |
| Drawing reference | Exact schematic line and terminal reference |
The RFQ should not only ask for “NO/NC auxiliary contacts.” It should require function-specific contact mapping so that the control scheme cannot be misunderstood during panel engineering.
A practical RFQ table can combine the mandatory control-circuit and interlocking fields into one supplier-completed schedule. The buyer can issue the table with “supplier to complete” entries instead of inserting assumed values.
| لا. | Data-sheet field | Supplier response required |
|---|---|---|
| 1 | VCB control schematic | Submit complete elementary diagram |
| 2 | Terminal diagram | Submit customer terminal references |
| 3 | Closing release / closing coil | Identify tag, terminals, and circuit path |
| 4 | Shunt release / trip coil | Identify tag, terminals, and command sources |
| 5 | Anti-pumping relay or function | Identify method and schematic location |
| 6 | Charging motor | Identify terminals and control contacts |
| 7 | Mechanism auxiliary contacts | Provide contact schedule and function |
| 8 | 52 auxiliary switch | Identify contacts used in trip, close, indication, or interlock circuits |
| 9 | Blocking-magnet contacts | State whether included and what condition they block |
| 10 | Push-button interlocking auxiliary contacts | State whether included and how local operation is affected |
| 11 | Close-block contact | Identify contact, operating condition, and circuit position |
| 12 | Own auxiliary contact in close path | Confirm wiring does not defeat anti-pumping behavior |
| 13 | Other-breaker auxiliary interlock | Identify if interlocking through other breakers is required |
| 14 | Truck interlock components | State whether included and provide schematic references |
| 15 | Racking-related trip interlocks | State positive or negative trip interlock arrangement if applicable |
| 16 | Position-dependent close prevention | Define service, test, disconnected, and racking behavior as applicable |
| 17 | Disconnector or earthing-switch interlock | Define switchgear-side electrical or mechanical interface |
| 18 | Magnetic lockout mechanism | State whether used for switchgear-side interlocking |
| 19 | Mechanical closing prevention | Define conditions that physically prevent closing |
| 20 | Electrical closing prevention | Define contacts or circuits that prevent electrical closing |
| 21 | FAT functional checks | List checks for close, trip, anti-pump, position interlock, and blocking functions |
| 22 | Scope boundary | Define what is supplied with the VCB and what is supplied by the switchgear builder |
This table keeps the RFQ factual. It asks the VCB supplier to declare actual devices, functions, and drawings instead of forcing a generic control philosophy onto different breaker designs.
The RFQ can include the following wording:
“The VCB supplier shall provide a complete control-circuit and interlocking data sheet for the offered breaker. The submission shall identify the closing release or closing coil, shunt release or trip coils, anti-pumping relay or anti-pumping function, charging motor, mechanism auxiliary contacts, blocking-magnet contacts, push-button-interlocking auxiliary contacts, close-block contacts, 52 auxiliary switch contacts, truck or racking interlocks, and any switchgear-side interlock interfaces required for disconnector or earthing-switch coordination. The supplier shall provide elementary diagrams, terminal diagrams, and a contact schedule showing the function, location, normal state, and wiring destination of each control or interlock contact. The supplier shall also confirm that the breaker’s own auxiliary contacts are not wired in a manner that defeats the intended anti-pumping function.” Use the VCB operating-failure troubleshooting to separate control-circuit, coil, interlock, and mechanism causes after a failed operation.
This wording stays within documented VCB control-circuit concepts while forcing the offer to expose the details that matter for engineering review.
A VCB RFQ control circuit interlocking data sheet is a supplier-completed schedule that identifies the breaker’s closing, tripping, anti-pumping, charging, auxiliary-contact, blocking, racking, and switchgear-interlock functions. It should include schematic references, terminal references, contact functions, and scope boundaries so the buyer can verify how the VCB will be controlled and interlocked in the switchgear.
The most important field is the supplier’s declaration of how anti-pumping is achieved and how it is protected from incorrect close-circuit wiring. ABB VCB documentation identifies anti-pumping relays as part of the control circuit, and Schneider guidance warns that the breaker’s own auxiliary contacts must not be wired in series with the closing release and close contact in a way that defeats the mechanical anti-pump system.
Breaker auxiliary contacts generally indicate or follow breaker mechanism status, such as the 52 auxiliary switch or mechanism auxiliary contacts. Interlocking contacts are used to permit, block, or coordinate operations such as closing, tripping, push-button operation, racking, disconnector operation, or earthing-switch coordination. Some contacts may appear in the same control drawing, but the RFQ should require the supplier to state each contact’s actual function.
A close-block contact is a contact used in the closing or interlocking circuit to prevent electrical closing under defined conditions. ABB SecoVac documentation describes a close-block contact together with the closing coil, anti-pumping relay, 52 auxiliary switch, trip coils, charging motor, and optional block and truck interlock components. The RFQ should require the supplier to identify the contact, its operating condition, and its position in the close circuit.
Position-dependent closing prevention means the VCB can be mechanically or electrically prevented from closing depending on its position or the position of associated switchgear devices. Siemens documentation describes VCB electrical and mechanical interlocks, including disconnector or earthing-switch interlocking through magnetic lockout mechanisms and position-dependent prevention of mechanical and electrical closing. The RFQ should require the supplier to define which positions permit or block closing.
