Product description
3.6 3RB21 electronic overload relays
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
32 Manual, 09/2016, A5E03656507420A/RS-AB/003
3RB21 electronic overload relays
3RB2153 electronic overload relays, size S6, 120 mm width
3RB2153 overload relay equipment
Connection for contactor mounting:
In terms of their electrical and mechanical features and their design, these busbars are perfectly compatible with
3RT1 contactors for the direct mounting of overload relays.
②
Switch position indicator and TEST function for wiring:
Indicates a trip and facilitates testing of the wiring.
③
RESET button
A device set to manual RESET can be reset locally by pressing the RESET button. On the 3RB21 an electronic
remote RESET is integrated.
④
Tripping class setting / internal ground-fault detection (3RB21 only): The rotary switch is used to set the required
tripping class dependent upon the starting conditions and activate internal ground-fault detection.
⑤
Electronics test (device test):
Enables a test of all major device components and functions.
Control circuit terminal (removable):
A screw-type or spring-loaded system can be used to connect the control circuit terminal.
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