PSTB470-600-70 470 A 208-600 V AC Soft Starter

The ABB PSTB470-600-70 is a Switch for industrial control and automation applications.

ABB PSTB470-600-70 is a soft starter rated 470 A for in-line connection with a main circuit range of 208 to 600 V AC. Its built-in electronic overload protection and 115 % service factor support continuous duty without external overload hardware.

What does the PSTB470-600-70 contribute to motor starting cost control?

The current limit function spans 1.5 to 7xIe, letting engineers cap inrush current and reduce demand charges. Ramp time is adjustable from 0 to 120 seconds, so acceleration profiles can be tuned to mechanical load rather than fixed by motor characteristics. At 400 V the in-line rating is 250 kW; at 500 V it reaches 315 kW. Inside-delta connection raises operational current to 814 A and power to 450 kW at 400 V or 600 kW at 500 V, which can defer the cost of a larger frame size.

How do the control and I/O specifications support integration?

The control supply accepts 100 to 250 V AC at 50/60 Hz, and the control circuit operates at 24 V DC. Four signal relays (run, by-pass, fault, overload) provide discrete status to a PLC, while analog outputs are selectable among 0…20 mA, 4…20 mA, and 0…10 volts. A FieldBusPlug interface is standard, enabling network connection without additional hardware in many architectures. The starting capacity of 3xIe for 15 seconds covers heavy-load starts, and the unit permits 10 starts per hour at 3.5xIe for 7 seconds with 50 % on time.

Which installation details affect commissioning time?

Main terminals use bars with 10.5 mm hole diameter and 25x6 mm width, tightened to 35 N·m. Control and supply circuits accept rigid conductors up to 2.5 mm² at 0.5 N·m. The main terminals carry IP00 protection per IEC 60529, so the enclosure must provide the required degree of protection. Ambient operating temperature is 0 to +50 °C, and storage range is -25 to +70 °C. Overall dimensions are 366 mm wide, 460 mm high, and 361 mm deep, with a net weight of 31 kg.

What maintenance and reliability factors reduce lifecycle cost?

Electronic overload protection is integrated, so no separate thermal relay is needed. LED indication covers ready-to-start (green), protection (yellow), and fault (red), simplifying diagnosis during routine inspection. Because the service factor is 115 %, the starter can run at elevated load without tripping. Periodic checks of terminal torque and cooling airflow help sustain these ratings over time.