Feature

Electronic motor protection relays

WEG's new RW_E relays offer a wider adjustment range to suit a broad spectrum of motor powers, delivering 87 percent less power dissipation than conventional thermal devices.

21/06/2015 13:15:13

The relays’ wide current adjustment range of 1:5 ratio between the lowest and highest settings allows coverage of an extensive variety of motor powers at rated operating voltages up to 690Vac.

They have ratings from 0.4A to 840A and protect electric motors for normal or heavy-load starting against overheating due to overload, phase drop-out or phase asymmetry.

Powered by the motor’s current without any need for additional external power connections, RW_E relays feature a 'thermal memory' which models the heat balance of the motor to ensure optimum protection.

Trip classes 10, 20 and 30 for normal and heavy-load starting can be set easily on the front panel.

Written By Sophia Bell

Sophia Bell is the Group Editor of DPA, Connectivity, and PBSI. She joined the team in 2020 as Assistant Editor after achieving a First-Class Honours BA in English Literature and Film Studies from the University of East Anglia. In her current role, she leads the editorial strategy, driving digital growth and ensuring each title continues to deliver trusted, relevant insight for engineering and manufacturing professionals.