Overload Relay

The Sprecher+Schuh CEP 7-B electronic overload relay from NHP is an enhanced version of the standard CEP 7. Covering motors up to 48 kW and up to 85 A at 415 V, this overload relay takes the basic CEP 7 overload relay and adds to it some new features. These include increased tripping accuracy, rapid phase failure detection, ground fault protection, jam/stall protection, low thermal dissipation, adjustable selection of motor run up times (10, 15 or 20 selectable via DIP-switches), auto/manual reset, visible trip indication and test button. It is a self-powered unit that also houses 1 normally-open 1 normally-closed electrically isolated alarm contacts.

The jam/stall function will detect motor currents higher than 400% of the set current, tripping the overload in 0.5 ms.

The relay detects ground faults at levels before they become short circuits, allowing protection against greater damage that would occur under short circuit conditions.

This is controlled by a DIP-switch on the front of the CEP 7-B. The sensitivity of the relay is between 40 and 60% of the current dial setting.