ABB E800DU-800 Overload Relay Inquiry Item

This ABB E800DU-800 is a high-current electronic overload relay of ABB E800DU series, suitable for high-power three-phase asynchronous motor protection. The setting current range is 250A to 800A. It supports optional trip class 10, 20 and 30, and integrates overload protection, phase loss protection, phase unbalance protection and stall protection. It can be used together with AF series large AC contactors. It adopts electronic sampling mode, with higher protection accuracy than traditional bimetallic thermal relay. It is widely used in large pumps, fans, crushers and other heavy-load motor control loops in metallurgy, mining, chemical industry and power plants.

Specifications

Model: E800DU-800 Brand: ABB Setting current range: 250 ~ 800A Trip class: 10 / 20 / 30 selectable Rated insulation voltage: 690V Protection function: Overload, phase failure, phase unbalance, locked rotor Matching contactor: ABB AF series large contactor Auxiliary contact: NO/NC alarm contact Certifications: CE, UL, CSA Ambient temperature: -25℃ ~ +70℃

Components & TroubleshootingCurrent sampling transformer, signal processing circuit board, trip action mechanism, status indicator, auxiliary contact group, plastic housing, wiring terminal. Common faults: False tripping under normal load, no action when overload, phase loss protection failure, indicator abnormal, auxiliary contact no alarm output.

Disclaimer

This spare part shall be installed, calibrated and maintained by qualified instrument technicians. Set the protection current value according to the rated motor current before commissioning.