Features and technical specifications:
1. Overload protection, phase failure protection and unbalance protection
2. Internal ground-fault detection (activatable)
3. Internal power supply
4. Auxiliary contacts 1 NO + 1 NC
5. Manual and automatic RESET
6. Electrical remote RESET integrated
7. Switch position indicators
8. TEST function and self-monitoring
Accessories :-
solid-state overload relays:
1. One terminal bracket each for the overload relays size S00 and S0 (sizes S2 to S12 can be installed as stand-alone installation without a terminal bracket)
2. One mechanical remote RESET module for all sizes
3. One cable release for resetting devices which are difficult to access (for all sizes)
4. One sealable cover for all sizes
5. Box terminal blocks for sizes S6 and S10/S12
6. Terminal covers for sizes S2 to S10/S12
Application :-
The 3RB20/3RB21 solid-state overload relays have been designed for the protection of induction motors in sinusoidal
50/60 Hz voltage networks. The relays are not suitable for the protection of single-phase AC or DC loads. The 3RU11 thermal overload relay or the 3RB22/3RB23 solid state overload relay can be used for single-phase AC loads. For DC loads we recommend the 3RU11 thermal overload relay.
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