Siemens SIRIUS 3RU2 - Page 32

Product description
3.6 3RB31 solid-state overload relays
SIRIUS Innovations - SIRIUS 3RU2 thermal overload relays / SIRIUS 3RB3 solid-state overload relays
32 Manual, 09/2014, A5E03656507420A/RS-AA/002
3RB3123 solid-state overload relays, size S0, 45 mm width
Front view
Description
3RB3123 overload relay equipment
Position digits
①
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.
④
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
ground-fault detection.
⑤
Electronics test (device test):
Enables a test of all major device components and functions.
⑥
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 main circuit terminal.
⑧
Selector switch for manual/automatic RESET and RESET
button:
The slide switch is used to choose between manual and
automatic RESET.
⑨
Motor current setting:
The large rotary button provides an easy means of setting the
device to the rated motor current.
⑩
Label
Terminal labels
2/T1 Main circuit terminals
4/T2
6/T3
95 NC contact (NC 95-96)
96
97 NO contact (NO 97-98)
98