Product description
3.8 3RB31 solid-state overload relays
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
Manual, 09/2016, A5E03656507420A/RS-AB/003
43
3RB3123 electronic overload relays, size S0, 45 mm width
3RB3123 overload relay equipment
Connection for contactor mounting:
In terms of their electrical and mechanical features and their
design, these pins are perfectly compatible with the
3RT2 contactors for the direct mounting of overload relays. Stand-
alone assembly is also an option (in some cases in conjunction with
a stand-alone assembly module).
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. In addition, an electronic remote RESET is
integrated into the 3RB31.
Tripping class setting/internal ground-fault detection:
This rotary switch is used to set the required tripping class
dependent upon the starting conditions and activate internal
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.
⑦
Main circuit terminal:
A screw-type or spring-loaded system can be used to connect the
Selector switch for manual/automatic RESET and RESET button:
The slide switch is used to choose between manual and automatic
⑨
Motor current setting:
The large rotary button provides an easy means of setting the
device to the rated motor current.
Label / Data Matrix code (behind the label)
Main circuit terminals
NC contact (NC 95-96)
NO contact (NO 97-98)
Terminals for electrical remote RESET
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