Product Overview
When high-power motors need controlled starts, the GE PSTB470-600-70 softstarter delivers reliable performance. This 470 A unit handles main circuits from 208 to 600 V AC, making it suitable for demanding industrial applications. With a control supply voltage of 100–250 V AC and a 50/60 Hz frequency rating, it integrates easily into existing systems. The PSTB470-600-70 features built-in electronic overload protection and supports inside delta connection for higher power ratings.
Part of the PSTB470 series, this GE softstarter is engineered for longevity and precision. Its robust design includes multiple signal relays and analog outputs, giving operators clear feedback and control. Whether you are upgrading legacy starters or installing new equipment, the PSTB470-600-70 offers a dependable solution.
Technical Specifications
The following parameters define the performance of the GE PSTB470-600-70. These values are critical for proper system design and integration.
| Parameter |
Value |
| Rated Operational Voltage |
Main Circuit 208 ... 600 V AC |
| Rated Control Supply Voltage (Us) |
100 ... 250 V AC |
| Rated Control Circuit Voltage (Uc) |
DC Operation 24 V |
| Rated Frequency (f) |
50/60 Hz (Main Circuit 50/60 Hz) |
| Rated Operational Power – In-Line Connection (Pe) |
(400 V) 250 kW, (500 V) 315 kW |
| Rated Operational Current – In-Line Connection (Ie) |
470 A |
| Rated Operational Power – Inside Delta Connection |
at 400 V 450 kW, at 500 V 600 kW |
| Rated Operational Current – Inside Delta Connection |
814 A |
| Service Factor Percentage |
115 % |
| Overload Protection |
Built-in electronic overload protection |
| Starting Capacity at Maximum Rated Current Ie |
3xIe for 15s |
| Ramp Time |
0 ... 120 s (or 1 ... 120 s) |
| Initial Voltage During Start |
30 ... 70 % |
| Step Down Voltage Special Ramp |
100 ... 30 % |
| Current Limit Function |
1.5 ... 7xIe |
| Analog Outputs |
0…10 V, 0…20 mA, 4…20 mA |
| Signal Relays |
Run, By-pass, Fault, Overload |
| Number of Starts Per Hour (3.5*Ie, 7s, 50% ON) |
10 |
| Degree of Protection |
IP00 (Main Terminals) per IEC 60529, IEC 60947-1, EN 60529 |
| Terminal Type (Main Circuit) |
Bars |
| Connecting Capacity (Main Circuit) |
Hole Diameter 10.5 mm; Width/Thickness 25x6 mm |
| Connecting Capacity (Control Circuit) |
Rigid 1 x 2.5 mm², Rigid 2 x 1.5 mm² |
| Tightening Torque |
Control 0.5 N·m, Main 35 N·m, Supply 0.5 N·m |
| Ambient Air Temperature (Operation) |
0 ... +50 °C |
| Storage Temperature |
-25 ... +70 °C |
| Dimensions (W x H x D) |
366 x 460 x 361 mm |
| Net Weight |
31 kg |
Industry Applications
The GE PSTB470-600-70 softstarter excels in heavy-duty applications where smooth acceleration reduces mechanical stress and electrical surges. Typical uses include:
-
Pumping Systems: Control large pumps to prevent water hammer and pipeline damage.
-
Conveyor Belts: Soft-start capability reduces belt slippage and wear on gearboxes.
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Compressors: Limit inrush current during start-up, protecting the motor and power supply.
-
HVAC Fans: Provide controlled ramp-up to avoid excessive vibration and noise.
With its 470 A rating and 600 V AC capability, this unit suits high-power industrial environments. The built-in overload protection and adjustable ramp times make it a versatile choice for many motor control applications.
Installation & Setup Guidance
Proper installation ensures optimal performance and safety. Follow these guidelines:
- Mount the PSTB470-600-70 in a well-ventilated enclosure that allows adequate airflow; ambient temperature must stay between 0 °C and +50 °C.
- Ensure the main circuit voltage matches the 208–600 V AC rating and the control supply is within 100–250 V AC.
- Use the specified tightening torques: 35 N·m for main circuit terminals, 0.5 N·m for control and supply circuits.
- Connect the control circuit wiring with appropriate cross-sections (e.g., rigid 1 x 2.5 mm² or 2 x 1.5 mm²).
- For inside delta operation, activate the internal delta switch to achieve higher power ratings (up to 600 kW at 500 V).
- Verify that the motor’s full-load current does not exceed the unit’s rated current (470 A in-line, 814 A inside delta).
Always consult the technical documentation (data sheet 1SFC132005C0201) for detailed wiring diagrams and configuration steps.
Maintenance & Reliability
The GE PSTB470-600-70 is designed for continuous industrial use. Regular maintenance ensures long service life and minimizes downtime.
- Periodically inspect the main terminals for signs of overheating or loose connections; retighten to the specified torque of 35 N·m.
- Clean dust and debris from the enclosure and ventilation openings to maintain proper cooling.
- Check the LED indicators: green for ready/standby, yellow for protection, red for fault. Address any fault immediately.
- Verify that the overload protection settings match the motor’s full-load current; recalibrate if necessary.
- Monitor the number of starts per hour; the unit is rated for 10 starts per hour at 3.5xIe for 7 seconds with 50% ON/OFF duty.
With a service factor of 115%, the PSTB470-600-70 can handle occasional overloads without tripping, providing extra reliability in demanding conditions.
Buying Guide
When selecting a softstarter, verify that the voltage, current, and power ratings match your motor specifications. The PSTB470-600-70 is ideal for motors up to 250 kW at 400 V in-line connection, or 450 kW at 400 V inside delta. Confirm control voltage compatibility and available communication options (FieldBusPlug standard).
PLC Source PRO offers this GE softstarter as a genuine spare part, ensuring compatibility and quality. With careful selection, you can achieve efficient motor control and extended equipment life.