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  • ABB PSTX720-600-70 Soft Starter — Product Description

    1. Product Overview

    The ABB PSTX720-600-70 soft starter is a high-performance device for smooth motor start-up. It reduces inrush current, minimizes mechanical stress, and provides overload protection. This soft starter supports direct start, bypass operation, and multiple protection features, suitable for industrial pumps, fans, compressors, and automation systems. It is compact, easy to operate, and ideal for low-voltage three-phase asynchronous motors.

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    2. Technical Specifications

    • Model: PSTX720-600-70

    • Type: Soft Starter

    • Rated Operational Voltage (Ue): 380–690V AC

    • Rated Current (Ie): 720 A

    • Max Starting Current: 600 A

    • Rated Motor Power (AC-3, 400V): 710 kW

    • Control Method: Voltage-controlled start/stop

    • Protection Functions:

      • Overload protection

      • Phase loss protection

      • Short-circuit protection (with external breaker)

      • Over-temperature protection

    • Communication Interface: Optional Modbus, Profibus, Ethernet/IP

    • Bypass Function: Built-in bypass contactor to reduce heat and power loss

    • Operating Temperature: -20°C to +60°C

    • Protection Class: IP20 (for cabinet installation)

    • Mounting: Panel / DIN-rail adaptable

    • Dimensions (typical): ~800×400×300 mm (depends on power rating)

    • Frequency: 50/60 Hz

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    3. Features & Advantages

    • Smooth motor start reduces peak current and mechanical stress

    • Reliable protection with built-in overload, phase loss, and over-temperature safeguards

    • Energy-efficient with bypass function reducing standby losses

    • Flexible installation compatible with multiple communication protocols

    • User-friendly with intuitive display and modular design for easy maintenance

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    4. Application Areas

    • Industrial pumps, fans, compressors

    • Conveyors, elevators, machinery

    • HVAC systems and large air conditioning units

    • Automated production lines and factory control systems

    • Water treatment plants, power stations, industrial energy management

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    5. Precautions

    • Ensure soft starter rated current matches motor full-load current.

    • Disconnect main power before installation or maintenance.

    • Use with external circuit breakers and fuses for short-circuit protection.

    • Avoid high humidity, corrosive gases, or dusty environments.

    • Regularly inspect terminals and cooling to ensure proper heat dissipation.

    • Set software parameters according to motor load characteristics.

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