Model: SET-TSC-20G / 30G / 40G / 50G / 60G
SET-TSC-G three phase thyristor switch for AC 380V common compensation, with zero-crossing control and 20–60 kVAR capacitor-stage options.
The SET-TSC-G three phase thyristor switch connects and disconnects three-phase delta-connected capacitor stages without mechanical contacts. Voltage-zero turn-on and current-zero turn-off help suppress inrush current, switching overvoltage, arcing and contact wear in rapidly changing reactive-power systems.
The trigger circuit commands conduction close to voltage zero and releases the capacitive load at current zero. This provides smoother capacitor-bank insertion and removal.
Anti-parallel high-power thyristors replace the repeatedly opening mechanical contacts used in a conventional capacitor contactor, eliminating arcing and contact bounce.
Fast response makes the switch suitable for low-voltage dynamic compensation cabinets serving welding, lifting, rolling, injection-moulding and other fluctuating loads.
The G-series is designed for common three-phase compensation. L1, L2 and L3 connect to the three-phase supply, while C1, C2 and C3 connect to a delta-connected capacitor group. One controller output commands all three phases together.
| Product family | SET-TSC-G three-phase thyristor switch |
|---|---|
| Rated system voltage | Three-phase AC 380 V |
| Rated frequency | 50 Hz |
| Control voltage / current | DC 5–12 V / 12 mA |
| Connection | Three-phase common compensation, Δ capacitor bank |
| Rated stage capacity | 20 / 30 / 40 / 50 / 60 kVAR |
| Voltage distortion limit | ≤5% |
| Switching response | Less than 20 ms |
|---|---|
| Thyristor reverse voltage | 1800 V class |
| Overall dimensions | 190 × 118 × 206 mm |
| Mounting dimensions | 179 × 35 mm |
| Operating temperature | −25°C to +45°C |
| Relative humidity | ≤90%, good ventilation required |
| Installation altitude | ≤2000 m |
The switching module monitors heat-sink temperature. The documented protection logic disconnects the load when the heat sink exceeds approximately 80°C and restores switching after cooling to approximately 65°C. Fan control starts around 50°C and stops around 35°C.
Install vertically on a rigid cabinet mounting plate and maintain at least 30 mm clearance between adjacent switches. Provide unobstructed ventilation around the heat sink. Verify capacitor voltage, stage capacity, fuse protection, conductor sizing and controller polarity before energizing.
For factory testing without a capacitor connected, the operation manual recommends an incandescent lamp as a temporary dummy load. Final commissioning must be performed with the designed protection and capacitor stage.
| Model | Matched capacitor stage | Connection | Dimensions |
|---|---|---|---|
| SET-TSC-20G | Up to 20 kVAR | Three-phase Δ | 190 × 118 × 206 mm |
| SET-TSC-30G | Up to 30 kVAR | Three-phase Δ | 190 × 118 × 206 mm |
| SET-TSC-40G | Up to 40 kVAR | Three-phase Δ | 190 × 118 × 206 mm |
| SET-TSC-50G | Up to 50 kVAR | Three-phase Δ | 190 × 118 × 206 mm |
| SET-TSC-60G | Up to 60 kVAR | Three-phase Δ | 190 × 118 × 206 mm |
No. A pure thyristor switch carries the load electronically during operation and provides faster, wear-free switching. A composite switch uses thyristors during the transition and transfers steady current to a magnetic-latching contact, reducing continuous semiconductor losses.
No. The G-series switches a three-phase delta-connected capacitor stage as one common group. Use the SET-TSC-F split-phase series when phases A, B and C must be controlled independently.
Check control-voltage magnitude and polarity, capacitor fuses, open-circuit capacitors, heat-sink temperature and system harmonics. The protection circuit may intentionally block switching when the supply condition is unsuitable.
Choose the SET-TSC model at or above the capacitor stage rating and confirm voltage, connection, ventilation and protection coordination. SET can review the controller, capacitor and reactor schedule as one system.
SET can match the thyristor switch, controller, capacitor, reactor, fuse protection and cabinet thermal design for fast common compensation.
