Siemens SIRIUS 3RU2 Manual page 26

Product description
3.4 3RU21 thermal overload relays
3RU2136 thermal overload relay, size S2, 55 mm width
Front view
3RU2136 overload relay equipment
A sealable transparent cover can be optionally mounted on the thermal overload relays in
the sizes S00, S0 and S2 (Accessories (Page 83)). It stops the motor setting being tampered
with.
Auxiliary contacts
3RU21 thermal overload relays are equipped with an NO contact for the "tripped" message
and an NC contact for disconnecting the contactor.
26
Description
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 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
Motor current setting:
The large rotary button provides an easy means of setting the
device to the rated motor current.
④
Main circuit terminals:
A screw-type connection system can be used to connect the
main circuit terminal.
⑤
Control circuit terminals:
A screw-type or spring-loaded connection system can be used
to connect the control circuit terminal.
⑥
STOP button:
Pressing the button opens the NC contact, thereby
disconnecting the downstream contactor. The NC contact
closes again when the button is released.
⑦
Selector switch for manual/automatic RESET and RESET
button: This switch is used to choose between manual and
automatic RESET. A device set to manual RESET can be reset
locally by pressing the RESET button. The device can be reset
remotely using the RESET modules (accessories) which are
compatible for use with all sizes.
⑧
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
SIRIUS Innovations - SIRIUS 3RU2 thermal overload relays / SIRIUS 3RB3 solid-state overload relays
Manual, 09/2014, A5E03656507420A/RS-AA/002