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XBRELE supplies a full range of dry type transformers based on cast resin and epoxy resin technology, designed for indoor substations, commercial buildings and projects with strict fire-safety requirements. The SCB, SC(B) and SGB series cover 6–35 kV classes with low loss, reliable insulation performance and easy maintenance.
Dry type transformers use cast resin or epoxy resin insulation instead of oil, making them ideal for indoor substations and buildings with strict fire-safety requirements. XBRELE dry type distribution transformers are designed for 6–35 kV networks, with low loss, low noise and easy maintenance for long-term operation.
Based on SCB, SC(B) and SGB series designs, these cast resin transformers and epoxy resin transformers provide reliable performance in high-rise buildings, hospitals, metro stations, commercial complexes and other densely populated areas where oil-filled units are not preferred.
XBRELE products are developed with reference to international standards such as IEC 60076-11 dry-type power transformers , ensuring consistent insulation levels and temperature-rise performance.
For a complete view of our power distribution transformer portfolio, including oil-immersed and 11 kV dry type transformer options, visit the Power Distribution Transformers pillar page .
Switch between SCB10 / SCB11, SCB13, SCB11-35kV and SG(B)10 eco-friendly dry type transformers to review rated capacities, voltage combinations and key loss parameters for indoor, fire resistant applications.
SCB10 and SCB11 dry-type transformers adopt vacuum cast epoxy resin technology with F or H class insulation, low partial discharge and excellent fire resistance. They are widely used in high-rise buildings, commercial complexes, hospitals, schools, subways and indoor substations where strict fire-safety requirements apply.
Main Technical Parameters — SCB10 6/10kV 30–2500kVA Dry-Type Voltage Regulation Distribution Transformer
| Rated capacity (kVA) | No-load loss (kW) | Load loss 130°C (kW) | Load loss 155°C (kW) | Load loss 180°C (kW) | No-load current (%) | Short-circuit impedance (%) |
|---|---|---|---|---|---|---|
| 30 | 0.19 | 0.67 | 0.71 | 0.76 | 2 | 4.0 |
| 50 | 0.27 | 0.94 | 1 | 1.07 | 2 | 4.0 |
| 80 | 0.37 | 1.29 | 1.38 | 1.48 | 1.5 | 4.0 |
| 100 | 0.40 | 1.48 | 1.57 | 1.69 | 1.5 | 4.0 |
| 125 | 0.47 | 1.74 | 2.85 | 1.98 | 1.3 | 4.0 |
| 160 | 0.54 | 2.00 | 2.13 | 2.28 | 1.3 | 4.0 |
| 200 | 0.52 | 2.37 | 2.53 | 2.71 | 1.1 | 4.0 |
| 250 | 0.72 | 2.59 | 2.26 | 2.96 | 1.1 | 4.0 |
| 315 | 0.88 | 3.27 | 3.47 | 3.73 | 1.0 | 4.0 |
| 400 | 0.98 | 3.75 | 3.99 | 4.28 | 1.0 | 4.0 |
| 500 | 1.16 | 4.59 | 4.88 | 5.23 | 1.0 | 4.0 |
| 630 | 1.34 | 6.53 | 5.88 | 5.29 | 0.85 | 6.0 |
| 630 (20/24kV) | 1.30 | 5.61 | 5.96 | 6.40 | 0.85 | 6.0 |
| 800 | 1.52 | 6.55 | 6.96 | 7.46 | 0.85 | 6.0 |
| 1000 | 1.77 | 7.65 | 8.13 | 8.76 | 0.85 | 6.0 |
| 1250 | 2.09 | 9.10 | 9.69 | 10.3 | 0.85 | 6.0 |
| 1600 | 2.45 | 11.0 | 11.7 | 12.5 | 0.85 | 6.0 |
| 2000 | 3.05 | 13.6 | 14.4 | 15.5 | 0.70 | 6.0 |
| 2500 | 3.60 | 16.1 | 17.1 | 18.4 | 0.70 | 6.0 |
| 1600 (20/24kV) | 2.45 | 12.2 | 12.9 | 13.9 | 0.85 | 8.0 |
| 2000 (20/24kV) | 3.05 | 15.0 | 15.9 | 17.1 | 0.70 | 8.0 |
| 2500 (20/24kV) | 3.60 | 17.7 | 18.8 | 20.2 | 0.70 | 8.0 |
Note: 6kV / 10kV high-voltage windings with tap ranges ±2.5% / ±5% (and ±2×2.5% for part of the ratings). 20/22/24kV versions are marked in brackets. Data come directly from the SCB10 manufacturer catalogue.
Main Technical Parameters — SCB10 20kV 30–2500kVA Dry-Type Distribution Transformer
| Rated capacity (kVA) | No-load loss (W) | Load loss (W) | No-load current (%) | Short-circuit impedance (%) |
|---|---|---|---|---|
| 30 | 33 | 630 / 600 | 1.50 | 4.0 |
| 50 | 43 | 910 / 870 | 1.20 | 4.0 |
| 63 | 50 | 1090 / 1040 | 1.10 | 4.0 |
| 80 | 80 | 1310 / 1250 | 1.00 | 4.0 |
| 100 | 75 | 1580 / 1500 | 0.90 | 4.0 |
| 125 | 85 | 1890 / 1800 | 0.80 | 4.0 |
| 160 | 100 | 2310 / 2200 | 0.60 | 4.0 |
| 200 | 120 | 2730 / 2600 | 0.60 | 4.0 |
| 250 | 140 | 3200 / 3050 | 0.60 | 4.0 |
| 315 | 170 | 3830 / 3650 | 0.50 | 4.0 |
| 400 | 200 | 4520 / 4300 | 0.50 | 4.0 |
| 500 | 240 | 5410 / 5150 | 0.50 | 4.0 |
| 630 | 320 | 6200 | 0.30 | 4.5 |
| 800 | 380 | 7500 | 0.30 | 4.5 |
| 1000 | 450 | 10300 | 0.30 | 4.5 |
| 1250 | 530 | 12000 | 0.20 | 4.5 |
| 1600 | 630 | 14500 | 0.20 | 5.0 |
| 2000 | 750 | 18300 | 0.20 | 5.0 |
| 2500 | 900 | 21200 | 0.20 | 5.0 |
Note: 20kV SCB10 series uses high-voltage windings of 6 / 6.3 / 10 / 10.5 / 11kV on the low-voltage side, with tap ranges ±2×2.5% / ±5%. All data originate from the SCB10 20kV manufacturer catalogue.
Scope of Application: Especially suitable for places with high fire protection requirements, such as mines, oil fields, subways, power plants, schools, hospitals, commercial centers, and high-rise buildings.
Structural Features:
| Rated Capacity (kVA) | No-load Loss (kW) | Load Loss 130°C (kW) | Load Loss 155°C (kW) | Load Loss 180°C (kW) | Imp. (%) |
|---|---|---|---|---|---|
| 30 | 0.135 | 0.605 | 0.640 | 0.685 | 4.0 |
| 50 | 0.195 | 0.845 | 0.900 | 0.965 | 4.0 |
| 80 | 0.265 | 1.16 | 1.40 | 1.33 | 4.0 |
| 100 | 0.290 | 1.33 | 1.41 | 1.52 | 4.0 |
| 125 | 0.340 | 1.56 | 1.66 | 1.78 | 4.0 |
| 160 | 0.385 | 1.80 | 1.91 | 2.02 | 4.0 |
| 200 | 0.445 | 2.13 | 2.27 | 2.44 | 4.0 |
| 250 | 0.515 | 2.33 | 2.48 | 2.66 | 4.0 |
| 315 | 0.635 | 2.94 | 3.12 | 3.35 | 4.0 |
| 400 | 0.705 | 3.37 | 3.59 | 3.85 | 4.0 |
| 500 | 0.835 | 4.13 | 4.39 | 4.70 | 4.0 |
| 630 (Type A) | 0.965 | 4.97 | 5.29 | 5.66 | 4.0 |
| 630 (Type B) | 0.935 | 5.05 | 5.36 | 5.76 | 6.0 |
| 800 | 1.09 | 5.89 | 6.26 | 6.71 | 6.0 |
| 1000 | 1.27 | 6.88 | 7.31 | 7.88 | 6.0 |
| 1200 | 1.50 | 8.19 | 8.72 | 9.33 | 6.0 |
| 1600 | 1.76 | 9.94 | 10.5 | 11.3 | 6.0 |
| 2000 | 2.19 | 12.2 | 13.0 | 14.0 | 6.0 |
| 2500 | 2.59 | 14.5 | 15.4 | 16.6 | 6.0 |
| 1600 (High Imp) | 1.76 | 11.0 | 11.6 | 12.5 | 8.0 |
| 2000 (High Imp) | 2.19 | 13.5 | 14.3 | 15.4 | 8.0 |
| 2500 (High Imp) | 2.59 | 15.9 | 17.0 | 18.2 | 8.0 |
Note: Data derived from SCB13 6kV/10kV Class 13 dry-type non-excitation voltage regulation distribution transformer technical parameters.
Product Overview: The SCB11-35kV series utilizes three-phase solid molding (epoxy vacuum casting) and low-voltage foil coil technology. It offers high mechanical strength, short-circuit resistance, and is maintenance-free.
Key Specifications:
| Rated Capacity (kVA) | No-load Loss (kW) | Load Loss 130°C (kW) | Load Loss 155°C (kW) | Load Loss 180°C (kW) | No-load Current (%) | Imp. (%) |
|---|---|---|---|---|---|---|
| 50 | 0.450 | 1.34 | 1.42 | 1.52 | 2.3 | 6.0 |
| 100 | 0.630 | 1.97 | 2.09 | 2.23 | 2.0 | 6.0 |
| 160 | 0.790 | 2.65 | 2.81 | 3.00 | 1.5 | 6.0 |
| 200 | 0.880 | 3.13 | 3.32 | 3.55 | 1.5 | 6.0 |
| 250 | 0.990 | 3.58 | 3.80 | 4.06 | 1.3 | 6.0 |
| 315 | 1.17 | 4.25 | 4.51 | 4.82 | 1.3 | 6.0 |
| 400 | 1.37 | 5.10 | 5.41 | 5.79 | 1.1 | 6.0 |
| 500 | 1.52 | 6.27 | 6.65 | 7.11 | 1.1 | 6.0 |
| 630 | 1.86 | 7.25 | 7.69 | 8.23 | 1.0 | 6.0 |
| 800 | 2.16 | 8.60 | 9.12 | 9.76 | 1.0 | 6.0 |
| 1000 | 2.43 | 9.86 | 10.4 | 11.1 | 0.75 | 6.0 |
| 1250 | 2.83 | 12.0 | 12.7 | 13.6 | 0.75 | 6.0 |
| 1600 | 3.24 | 14.6 | 15.4 | 16.5 | 0.75 | 6.0 |
| 2000 | 3.82 | 17.2 | 18.2 | 19.5 | 0.75 | 6.0 |
| 2500 | 4.45 | 20.3 | 21.8 | 23.3 | 0.75 | 6.0 |
Note: HV rated voltages: 35kV, 36kV, 37kV, 38.5kV. Tapping range: ±2×2.5% or ±5%.
Load losses listed correspond to different insulation system temperatures (B=100K rise/130°C, F=120K rise/155°C, H=145K rise/180°C) per GB1094.11.
Product Features: The product uses DuPont new materials with insulation heat resistance grades reaching Class H (180°C) and key parts reaching Class C (220°C).
Safety & Reliability:
| Temperature Grade | Grade B | Grade F | Grade H | Grade C |
|---|---|---|---|---|
| Average Temperature Rise (°C) | 80 | 100 | 125 | 150 |
| Maximum Ambient Temperature (°C) | 40 | 40 | 40 | 40 |
| Hot Spot Temperature Tolerance (°C) | 10 | 15 | 20 | 30 |
| Maximum Temperature (°C) | 130 | 155 | 180 | 220 |
Note: Data reference for SG(B)10 type dry transformer insulation heat resistance grades.
XBRELE dry type transformers adopt cast resin and epoxy resin insulation with Class B, F, H and C systems, offering high fire safety, low loss and reliable performance for indoor power distribution in high-rise buildings, tunnels, commercial centers and public facilities.
SCB and SC(B) series use flame-retardant resin systems with very low smoke emission, making them suitable for critical locations where oil-filled transformers are restricted.
High-voltage windings are vacuum cast with epoxy resin or cast resin, ensuring excellent dielectric strength, moisture resistance and stable temperature rise under different insulation classes.
The core adopts high-grade oriented silicon steel with step-lap joints, while the low-voltage winding uses foil or multi-layer copper conductors for strong short-circuit withstand capability.
XBRELE dry type transformers follow IEC 60076-11 and GB/T 10228 requirements for insulation, temperature rise, short-circuit strength and partial discharge levels—ensuring safe indoor operation for 6–35 kV networks.
SCB / SC(B) / SGB series transformers are cast in controlled environments with vacuum drying, resin casting and precision coil winding to guarantee stable dielectric performance and low partial discharge.
High-grade oriented silicon steel is cut using CNC shearing and stacked with step-lap joints to reduce no-load loss.
Low-voltage foil windings and high-voltage multi-layer coils are wound under tension for strong short-circuit withstand capability.
Coils are vacuum-dried to eliminate moisture, improving insulation resistance and long-term stability.
High-voltage windings are cast with epoxy resin or cast resin under vacuum to reduce voids and partial discharge (PD).
Transformers undergo assembly, terminal installation and simulated load temperature-rise tests before inspection.
All tests comply with IEC 60076-11 and GB/T 10228 standards for cast-resin dry-type transformers.
From standard 11 kV dry type transformers to customised SCB / SC(B) / SGB solutions, XBRELE coordinates production, packing and logistics so your dry type distribution transformers arrive on time and ready for indoor installation.
Our dry type transformer lines support both standard catalogue ratings and project-based designs, helping EPCs and end users meet substation and building schedules.
Although dry type transformers are oil-free, they still require robust protection during transport, especially for cast resin windings, terminals and enclosures.
XBRELE provides technical support for installing and operating dry type transformers in indoor substations, commercial buildings and infrastructure projects.
These are the most frequent questions about Dry Type Transformers, including performance, safety, applications, and international standards.