SIEMENS
7/75
Siemens IC 10 · 2017
Overload Relays
General data
7
✓
Available
--
Not available
Features
3RU21
3RB30/3RB31
3RB20/3RB21
3RB22/3RB23
3RB24
Benefits
Other features (continued)
Overload warning
--
--
--
✓
✓
• Indicates imminent tripping of the relay
directly on the device due to overload,
phase asymmetry or phase failure through
flickering of the LEDs or in the case of the
3RB24 as a signal through IO-Link
• Allows the imminent tripping of the relay to
be signaled
• Allows measures to be taken in time in the
event of inverse-time delayed overloading
of the load for an extended period over the
current limit
• Eliminates the need for an additional device
• Saves space in the control cabinet
• Reduces wiring outlay and costs
Analog output
--
--
--
✓
✓
• Allows the output of an analog output signal
for actuating moving-coil instruments,
feeding programmable logic controllers or
transfer to bus systems
• Eliminates the need for an additional
measuring transducer and signal converter
• Saves space in the control cabinet
• Reduces wiring outlay and costs
© Siemens AG 2016