Low Voltage Soft Starter use thyristors (SCRs) to ramp up voltage at motor start, which reduces inrush current and mechanical stress.
| Item | Specification |
|---|---|
| 1. Electrical Ratings | |
| Main Supply Voltage | 200–575 V AC / 380–690 V AC (as specified) |
| Control Voltage | 24 V DC / 110–240 V AC (separate from main power) |
| Frequency | 50 Hz / 60 Hz |
| Rated Current / Motor Power | Up to 1250 A (model dependent) or equivalent motor kW rating |
| 2. Starting / Stopping Characteristics | |
| Start Ramp Time | Adjustable, typically from 1 s up to several seconds |
| Initial Voltage | Adjustable, typically 25% – 80% of full voltage |
| Soft Stop Function | Voltage ramp-down for controlled stopping (if provided) |
| 3. Protection Features | |
| Over-current Protection | Current limiting during motor starting |
| Overload / Thermal Protection | Electronic motor thermal protection |
| Phase Protection | Phase loss and phase unbalance detection |
| Voltage Protection | Over-voltage and under-voltage protection |
| Temperature Protection | SCR over-temperature protection |
| 4. Environmental / Mechanical Specifications | |
| Ambient Operating Temperature | –10°C to +60°C (typical) |
| Storage Temperature | As per manufacturer specification |
| Ingress Protection | IP00 or higher (model dependent) |
| Vibration Resistance | Suitable for industrial applications (as specified) |
| Heat Dissipation | Heat generated mainly during start; minimal during run (with bypass) |
| 5. Lifetime / Durability | |
| Number of Operations | Specified number of motor start cycles (model dependent) |
| Short-Circuit Capability | Withstand short-circuit current as per rating and coordination |
| 6. Communications / Interface | |
| Communication Interface | RS-485 (optional) |
| Communication Protocol | Modbus RTU (optional) |
| User Interface | Display or color touchscreen for status, monitoring, and parameter setting |
| Bypass Contactor | Built-in or external bypass to reduce heat loss during normal operation |