Overview of the GE PST250-600-70 Softstarter
The GE PST250-600-70 is a robust industrial automation module designed for smooth and reliable motor starting in demanding applications. With a rated operational current of 250 A for in-line connection and support for main circuits from 208 to 600 V AC, this softstarter is a dependable choice for controlling three-phase motors. The PST250-600-70 includes built-in electronic overload protection, multiple signal relays, and flexible analog outputs, making it a comprehensive solution for modern industrial control systems.
Technical Specifications of the GE PST250-600-70
The GE PST250-600-70 delivers precise control and protection. Key specifications include:
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Rated Operational Voltage: Main Circuit 208 ... 600 V AC
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Rated Control Supply Voltage (Us): 100 ... 250 V AC
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Rated Control Circuit Voltage (Uc): DC Operation 24 V
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Rated Frequency (f): 50/60 Hz
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Rated Operational Current (In-Line): 250 A
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Rated Operational Power (In-Line): 132 kW at 400 V, 160 kW at 500 V
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Rated Operational Current (Inside Delta): 430 A
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Rated Operational Power (Inside Delta): 220 kW at 400 V, 295 kW at 500 V
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Service Factor: 115%
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Overload Protection: Built-in electronic overload protection
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Starting Capacity: 3xIe for 15s
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Ramp Time: 0 ... 120 s
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Initial Voltage During Start: 30 ... 70%
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Current Limit Function: 1.5 ... 7xIe
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Analog Outputs: 0…10 V, 0…20 mA, 4…20 mA
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Signal Relays: Run, By-pass, Fault, Overload
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Communication: FieldBusPlug (Standard)
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Degree of Protection: IP00 (Main Terminals, acc. to IEC 60529)
These specifications ensure the PST250-600-70 handles heavy starting loads while protecting the motor and connected equipment.
Industry Applications for the GE PST250-600-70
The GE PST250-600-70 is suitable for a wide range of industrial applications, including:
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Pumps and Fans: Smooth acceleration reduces mechanical stress and prevents water hammer, extending pump and pipeline life.
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Conveyors: Controlled starting torque prevents belt slippage and product damage, improving operational reliability.
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Compressors: Limits inrush current, reducing electrical stress on the power supply and motor windings.
Thanks to its high starting capacity (3xIe for 15s) and current limit function (1.5-7xIe), the PST250-600-70 handles demanding starts even under heavy load conditions.
Installation and Setup Guidance
Proper installation ensures optimal performance of the GE PST250-600-70. Consider the following:
- Mount the unit in a well-ventilated enclosure to maintain ambient temperature within 0 ... +50 °C.
- Use the main circuit bars for power connections, with a hole diameter of 10.2 mm and bar width/thickness of 20x5 mm.
- For control and supply circuits, use rigid conductors: 1 x 2.5 mm² or 2 x 1.5 mm² for control, and 1 x 2.5 mm² for supply.
- Tighten main circuit terminals to 28 N·m, control and supply to 0.5 N·m.
- Set the ramp time and initial voltage according to the motor and load requirements.
Always follow local electrical codes and the manufacturer's guidelines.
Maintenance and Reliability
The GE PST250-600-70 is built for long service life. Routine maintenance includes:
- Periodically check terminal connections for tightness, especially after initial commissioning.
- Keep the unit clean and free from dust and moisture.
- Monitor the ambient temperature; the unit operates reliably from 0 to +50 °C and can be stored from -25 to +70 °C.
- Verify the built-in overload protection settings are appropriate for the motor.
With its electronic overload protection and signal relays, the PST250-600-70 helps minimize downtime and reduce maintenance costs.
Selection Guide and Purchasing Advice
Before purchasing the GE PST250-600-70, ensure it matches your motor's full-load current and voltage. The unit supports main circuits up to 600 V AC and control supply of 100-250 V AC. For inside delta connections, it can handle up to 430 A. The PST250-600-70 is part of the PST250 series and includes a fieldbus plug for communication. For reliable sourcing, consider PLC Source PRO as your industrial automation partner, offering genuine components and competitive pricing.