Siemens SIRIUS 3RU Manual page 26

Product description
3.4 3RU21 thermal overload relays
3RU2146 thermal overload relays, size S3, 70 mm width
Front view
3RU2146 overload relay equipment
A sealable transparent cover can be optionally mounted on the thermal overload relays in
the sizes S00, S0, S2 and S3 (Accessories (Page 123)). It stops the motor setting being
tampered with.
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
Data Matrix code
⑤
Main circuit terminals:
A screw-type connection system can be used to connect
the main circuit terminal. Ring terminal lug connection or
busbar connection after removal of the box terminal block
is optionally possible.
⑥
Control circuit terminals:
A screw-type or spring-loaded connection system can be
used to connect the control circuit terminal.
⑦
STOP button:
Pressing the button opens the NC contact, thereby
disconnecting the downstream contactor. The NC contact
closes again when the button is released.
⑧
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.
⑨
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 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
Manual, 09/2016, A5E03656507420A/RS-AB/003