ABB PSTX142-600-70 Three-Phase Softstarter
The PSTX142-600-70 is a three-phase softstarter rated at 142A operational current, with an operating voltage span of 208 to 600V AC. Designed for medium to large three-phase motors, it provides controlled soft start and stop via voltage or torque ramp, making it suitable for pumps, fans, compressors, and conveyors in commercial and industrial facilities across the UAE.
Key Features
- Rated operational current of 142A (in-line) with operating voltage range of 208-600V AC, suitable for medium to large motor applications
- Built-in bypass contacts for energy saving and reduced heat dissipation during running operation
- Soft start and soft stop via voltage ramp or torque control, reducing mechanical and electrical stress on motors and driven equipment
- Detachable full graphic display rated IP66, suitable for outdoor and harsh-environment installation
- Multi-protocol Fieldbus communication support including Modbus RTU/TCP, Profinet, Profibus, and Ethernet IP
- Genuine ABB quality — built-in electronic overload protection and comprehensive diagnostics
Technical Specifications
| Specification |
Details |
| Brand |
ABB |
| Model |
PSTX142-600-70 |
| Rated Operational Voltage |
208 - 600V AC |
| Rated Operational Current (In-Line) |
142A |
| Rated Operational Current (Inside Delta) |
245A |
| Rated Control Supply Voltage |
100 - 250V AC |
| Rated Control Circuit Voltage |
24V DC |
| Rated Frequency |
50/60 Hz |
| Rated Operational Power (400V, In-Line) |
75 kW |
| Starting Capacity at Max Current |
4 x Ie for 10s |
| Ramp Time |
1 - 120 seconds |
| Current Limit Function |
1.5 - 7.5 x Ie |
| Degree of Protection (Main Terminals) |
IP00 |
| Display Protection Rating |
IP66 (detachable, outdoor rated) |
| Communication |
Modbus-RTU, Modbus-TCP, Ethernet-IP, EtherCAT, DeviceNet, CANopen, Profibus, Profinet, BACnet-IP, BACnet-MSTP |
| Ambient Operating Temperature |
-25 to +60°C |
| Net Weight |
7 kg |
| Dimensions (W x H x D) |
199 x 377 x 283.3 mm |
| Standards |
Complies with CE, RoHS, REACH |
Applications
- Soft starting for large three-phase pump motors in water treatment and pumping stations
- Controlled start/stop for HVAC fan and compressor motors in commercial buildings
- Conveyor motor control in industrial and warehouse facilities
- Motor protection and diagnostics in panel builds requiring Fieldbus integration, suited to the high ambient temperatures common in UAE industrial environments
FAQ
-
What does a soft starter do?
It ramps motor voltage/current up and down gradually at start and stop instead of switching full voltage directly, reducing mechanical stress, inrush current, and water-hammer/pressure spikes in pumped or belt-driven systems.
-
How is this different from a variable frequency drive (VFD)?
A soft starter controls the motor only during starting and stopping — the motor runs at full line frequency/speed once started. A VFD continuously varies motor speed throughout operation. Choose a soft starter when you only need controlled start/stop, not variable running speed.
-
Does this need a bypass contactor?
Many installations add a bypass contactor once the motor is up to speed, to reduce heat dissipation and improve efficiency during normal running — check the specific model's documentation for bypass wiring guidance.
-
Can I install this myself?
No. Soft starters are wired into three-phase motor circuits and must be installed and commissioned by a qualified electrician or controls engineer.
