DIFFERENTIAL RELAYS

Differential relays are products that provide protection against indirect contact. Indeed, when a fault on an electrical product, a leakage current to earth is present. The differential relay across its core detects this leakage to earth. It is necessarily associated with a circuit breaker or tripping switch. The range of FRER differential relayscovers the various industrial and tertiary applications, ie applications with motors, variable speed drives, lifts, solar panels, lighting. These differential relays provide both protection and signaling. Thanks to their bright screen, it changes color depending on the state of the differential relay. Green screen, the relay is in normal operation. Orange screen, the alarm threshold has been exceeded and the time delay elapses. Red screen, alarm threshold and timeout are exceeded. Depending on the type of cabinet or electrical cabinet, Zélec France offers compact modular differential relays (2 modules) or for front door dimensions of 48×48 or 72×72. The sensitivity setting is between 30 mA and 300 A and the time delay is 0 to 20 seconds.

FRER differential relays comply with the requirements of EN 60947-2.

DIFFERENTIAL RELAYS FOR SPECIFIC APPLICATIONS

It is possible to mount a differential relay downstream of a variable speed drive to measure the possible leakage current of the motor connected downstream. In this case, the differential relay is a class B .