Electronic Overload Relay-Spring
The 3RB3 electronic overload relays up to 115 A and the 3RB2 electronic overload relays up to 630 A with internal power supply have been designed for inverse-time delayed protection of loads with normal and heavy starting (see Equipment Manual) against excessive temperature rises due to overload, phase asymmetry or phase failure.
SIRIUS 3RU and 3RB overload relays
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