SIEMENS
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Siemens IC 10 · 2017
Load Feeders and Motor Starters for Use in the Control Cabinet
SIRIUS 3RM1 motor starters
8
Device connectors for the control circuit
The device connectors for 3RM1 motor starters (24 V
DC control
supply voltage only) reduce the outlay for cabling by looping
through the control supply voltage. The device connectors can
be snapped onto a standard mounting rail or fixed to a level
mounting panel using screws.
Device connectors with 3RM1 motor starter
Using the device connectors exclusively for feeding in
the control supply voltage
By using device connectors, a maximum of five motor starters
can be supplied with 24 V DC control supply voltage. This re-
quires the control supply voltage to be applied to the A1 and A2
terminals of only one motor starter.
Device daisy chain connectors can be be used for gaps
between two motor starters. Device termination connectors
terminate a group.
Using the device connectors for safe group shutdown
In combination with the 3RM11 and 3RM13 Failsafe motor
starters, the device connector can also be used for safety-
related shutdown. For this application, groups of no more than
five Failsafe motor starters can be connected using a device
connector, and the group must be terminated with a terminating
connector. Removing the control voltage supply from the first
motor starter will safely shut down the whole group.
Safe group shutdown can be implemented particularly easily in
conjunction with 3SK safety relays. In this case, up to five motor
starters can be directly connected to 3SK safety relays via the
device connector and then safely shut down
(see page 11/10)
.
Ideal connection: Combination of four SIRIUS 3RM1 Failsafe motor
starters with SIRIUS 3SK safety relays
IC01_00218b
Motor
3RM1 motor starter
3SK safety relay
IC01_00178a
© Siemens AG 2016