Product Overview
The GE PSTX300-600-70 is a high-performance softstarter engineered for demanding motor starting applications. With a rated operational current of 300 A and a voltage range of 208...600 V AC, this industrial automation module delivers smooth, controlled starts and stops for three-phase motors.
Part of the PSTX series, the PSTX300-600-70 combines advanced control algorithms with robust construction. Its built-in bypass contactor minimizes energy losses during run mode, while the detachable graphic display with IP66 rating ensures easy local monitoring and configuration.
Technical Specifications
Every parameter of the GE PSTX300-600-70 is designed for reliability and precision. Key specifications include:
| Parameter |
Value |
| Rated Operational Current (Ie) |
300 A (in-line) |
| Rated Operational Voltage |
208 ... 600 V AC |
| Rated Control Supply Voltage (Us) |
100 ... 250 V AC |
| Rated Control Circuit Voltage (Uc) |
24 V DC |
| Rated Frequency |
50/60 Hz |
| Rated Operational Power (In-Line) |
90 kW @230 V, 160 kW @400 V, 200 kW @500 V |
| Rated Operational Power (Inside Delta) |
160 kW @230 V, 257 kW @400 V, 355 kW @500 V |
| Rated Operational Current (Inside Delta) |
515 A |
| Starting Capacity |
4xIe for 10 s |
| Ramp Time |
1 ... 120 s |
| Initial Voltage During Start |
30 ... 99 % |
| Current Limit Function |
1.5 ... 7.5 x Ie |
| Analog Outputs |
0...10 V, 0...20 mA, 4...20 mA |
| Communication Protocols |
Modbus RTU, Modbus TCP, Ethernet/IP, EtherCAT, DeviceNet, CANopen, Profibus, Profinet, BACnet/IP, BACnet/MSTP |
| Degree of Protection |
IP00 (main terminals) |
| Net Weight |
15.5 kg |
| Dimensions (W x H x D) |
258 x 470 x 279 mm |
The GE PSTX300-600-70 includes comprehensive protection functions: electronic overload, earth fault, phase reversal, under/over voltage, locked rotor, and more. Its built-in bypass relay and multiple signal relays (run, bypass, fault, overload) simplify integration into existing control systems.
Industry Applications
The GE PSTX300-600-70 is ideal for medium to large motors in pumps, fans, compressors, and conveyors. Its robust design and wide voltage range make it suitable for various industries, including water treatment, HVAC, and manufacturing.
For example, in a pumping station, the PSTX300-600-70 ensures gentle acceleration to prevent water hammer, while its pump cleaning function helps maintain efficiency. In conveyor systems, the soft start reduces mechanical stress and extends equipment life.
Installation and Setup
Mount the PSTX300-600-70 on a solid vertical surface with adequate clearance for airflow. Connect the main circuit using the bar terminals (hole diameter 10.2 mm) and tighten to 25 N·m. For control wiring, use rigid conductors up to 2.5 mm².
Configure start/stop/reset inputs and three programmable digital inputs via the keypad. The detachable display allows easy parameter adjustment. For fieldbus integration, use the built-in Modbus RTU or optional ANYBUS modules for protocols like Profinet and Ethernet/IP.
Maintenance and Reliability
Regularly inspect the PSTX300-600-70 for dust accumulation and loose connections. The built-in bypass reduces heat stress, extending service life. The device includes a thyristor runtime measurement and event log to aid predictive maintenance.
With an operating temperature range of -25°C to +60°C and storage from -40°C to +70°C, the PSTX300-600-70 performs reliably in harsh environments. Its comprehensive warnings (e.g., overvoltage, current imbalance, THD) help prevent unplanned downtime.
Compatibility and Integration
The GE PSTX300-600-70 supports a wide range of communication protocols, making it easy to integrate with PLCs, SCADA, and industrial networks. It works with Allen-Bradley, Siemens, and other major control systems via Modbus TCP, Profibus, or Ethernet/IP.
For inside-delta connections, the device includes a switch for this configuration, expanding its applicability to even larger motors.
Selection Guide
When selecting a softstarter, verify motor full-load current, voltage, and connection type (in-line or inside delta). The PSTX300-600-70 handles up to 300 A in-line and 515 A inside delta. Ensure your control voltage matches the 100-250 V AC supply.
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