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  • ABB EF460-500 Electronic Overload Relay — Product Description

    1. Product Overview

    The ABB EF460-500 is an electronic overload relay designed to protect three-phase asynchronous motors from overload and stall damage. The EF series combines precise electronic measurement with flexible adjustment for fast response and high reliability. It is intended for use with contactors for motor protection and widely applied in industrial automation, pumps, fans, compressors, and drive systems.

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    2. Technical Specifications

    • Model: EF460-500

    • Type: Electronic Overload Relay

    • Rated Current Range (Ie): 100–460 A

    • Setting Current: 380–460 A (adjustable)

    • Rated Operational Voltage (Ue): 500 V AC/DC

    • Trip Type: Adjustable thermal overload and instantaneous short-circuit protection

    • Frequency: 50/60 Hz

    • Control Method: Three-phase current monitoring

    • Contact Configuration: 1 NO + 1 NC, optional additional auxiliary contacts

    • Accuracy: ±5%

    • Response Time: <30 ms (instantaneous)

    • Communication Interface: Optional PROFIBUS, Modbus (select models)

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

    • Protection Class: IP20

    • Mounting: DIN rail or side-mount to contactor

    • Weight: ~3–5 kg

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    3. Features & Advantages

    1. High-precision protection

       • Accurate electronic measurement protects motor from overload and stall

       • Adjustable delay to suit different load types

    2. Flexible integration

       • Directly combinable with ABB contactors

       • Auxiliary contact outputs for alarms and remote control

    3. Fast response

       • Instantaneous electronic protection cuts off short circuits promptly

       • Adjustable delay accommodates industrial load variations

    4. Space-saving and easy installation

       • Compact design, suitable for control panels or alongside contactors

       • Quick DIN rail mounting

    5. High reliability

       • Digital processing and electronic measurement for long life and low maintenance

       • Built-in self-diagnostic functions enhance system safety

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    4. Typical Applications

    • Protection of motors in pumps, fans, compressors

    • Conveyors and drive systems

    • Industrial automation production lines

    • HVAC systems and large air conditioning motors

    • Water treatment plants, power systems, and energy management

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    5. Precautions

    • Ensure the relay rated current matches the motor full-load current

    • Must be used with compatible contactors

    • Installation and wiring must be performed with power off

    • Avoid prolonged use in humid, high-temperature, or corrosive environments

    • Regularly check relay terminals and contacts to ensure good connection

    • Set parameters according to load characteristics and application requirements

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