solid-state overload relays Block 3RB30

The following functions are available

1. Motor protection
2. System protection
3. Alternating current, 3-phase                                                                                                                                   3RB30 electronic overload relay :-
   ● Sizes S00 and S0:
   – Main and auxiliary circuits: optionally screw or spring-type terminals
   ● Size S2:
   – Main circuit: Screw connection with box terminal or through-hole technology
   – Auxiliary circuit: optional screw-type or spring-loaded connection
   ● Size S3:
   – Main circuit: Screw connection with box terminal or through-hole technology
   – Auxiliary circuit: optional screw-type or spring-loaded connection

This solid-state overload relays block is easily insert in your schematic diagram and connect as you like way.

electronic overload relays are designed to protect three-phase loads in sinusoidal 50/60 Hz voltage supplies.
An overload, phase asymmetry or a phase failure results in an increase of the motor current beyond the set rated motor current. This rise in current is detected by the current transformers integrated into the devices and evaluated by corresponding electronic circuits which then output a pulse to the auxiliary contacts. The contacts then disconnect the load via a contactor. (The contactor function is not an integral component of the overload relay). In addition to current-dependent protection for loads against impermissibly high temperature rise caused by overload, phase asymmetry, and phase failure, 3RB21 and 3RB31 electronic overload relays feature internal ground-fault detection (not possible in conjunction with contactor assemblies for star-delta (wye-delta) start). This provides protection of loads against high-impedance faults to ground caused by damaged insulation, moisture, condensation, etc.