The PST85-600-70 main circuit serves as the power switching stage for ABB softstarter assemblies. This unit handles motor starting current while limiting mechanical stress on driven equipment. Engineers specify it for pump, fan, and conveyor applications in industrial plants.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Main Circuit Assembly |
| Compatibility | ABB PST Series Softstarters |
| Rated Current | 85 A |
| Rated Voltage | 600 V AC |
| Control Voltage | 100–250 V AC |
| Interface | Line and Load Terminals, Control Connector |
| Dimensions | 260 mm x 150 mm x 210 mm |
| Weight | Approximately 4.20 kg |
| Component Count | 42 Power and Control Components |
| Energy Storage | None Required |
| Power Dissipation | Approximately 45 W at Full Load |
| Operating Temperature | -25°C to 60°C |
| Relative Humidity | 5% to 95%, Non-Condensing |
Power Switching Design
The assembly carries 85 A continuously at up to 600 V AC line voltage. Therefore, it starts medium-sized motors without direct-on-line current surges. Furthermore, thyristor control ramps voltage smoothly during each start sequence. Consequently, belts, gears, and couplings experience less mechanical wear.
Interface and Integration
Line and load terminals link the PST85-600-70 directly to the motor supply circuit. As a result, installers complete power wiring without extra adapters. Additionally, a control connector handles start, stop, and fault signals.
Thermal and Environmental Ratings
The unit dissipates roughly 45 W at full load and needs adequate airflow. Moreover, it operates from -25°C to 60°C in industrial enclosures. Consequently, it suits both indoor panels and protected outdoor installations.
Installation Notes
Operators mount the assembly vertically inside a ventilated control cabinet. The heavy frame requires secure fastening to bear cable and vibration loads. However, users should verify short-circuit protection ratings before commissioning.
Details
| Weight | 0.35 kg |
|---|---|
| Dimensions | 90 × 45 × 100 mm |
