SIEMENS
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Siemens IC 10 · 2017
Relays
SIRIUS 3RR24 Monitoring Relays for Mounting onto 3RT2 Contactors for IO-Link
Current and active current monitoring
10
3RR24 overview table
Features
3RR24
Benefits
General data
Sizes
Dimensions in mm
(W x H x D)
• Screw terminals
• Spring-type terminals
S00, S0, S2
S00: 45 x 79 x 80,
S0: 45 x 87 x 91,
S2: 55 x 99 x 112
S00: 45 x 90 x 80,
S0: 45 x 109 x 92,
S2: 55 x 99 x 112
• Are coordinated with the dimensions, connections and technical
characteristics of the other devices in the SIRIUS modular system
(contactors, soft starters, etc.)
• Permit the mounting of slim-line and compact load feeders in widths of
45 mm (S00 and S0) and 55 mm (S2)
• Simplify configuration
Current range
S00: 1.6 ... 16 A
S0: 4 ... 40 A
S2: 8 ... 80 A
• Is adapted to the other devices in the SIRIUS modular system
• Just a single version per size with a wide setting range enables easy
configuration
Permissible ambient temperature
During operation
-25 ... +60 °C
• Suitable for applications in the control cabinet, worldwide
Monitoring functions
Current overshoot
✓
(Three-phase)
• Provides optimum inverse-time delayed protection of loads against
excessive temperature rises due to overload
• Enables detection of filter blockages or pumping against closed gate
valves
• Enables drawing conclusions about wear, poor lubrication or other
maintenance-relevant phenomena
Current undershoot
✓
(Three-phase)
• Enables detection of overload due to a slipping or torn belt
• Guarantees protection of pumps against dry running
• Facilitates monitoring of the functions of resistive loads such as heaters
• Permits energy savings through monitoring of no-load operation
Apparent current monitoring
✓
(Selectable)
•
Precision current monitoring especially in a motor's rated and upper torque
range
Active current monitoring
✓
(Selectable)
•
Optimum current monitoring over a motor's entire torque range through the
patented combination of power factor and apparent current monitoring
Range monitoring
✓
(Three-phase)
•
Simultaneous monitoring of current overshoot and undershoot with a singe
device
Phase failure, open circuit
✓
(Three-phase)
• Minimizes heating of three-phase motors during phase failure through
immediate disconnection
• Prevents operation of hoisting equipment with reduced load carrying
capacity
Phase sequence monitoring
✓
(Selectable)
• Prevents starting of motors, pumps or compressors in the wrong direction
of rotation
Internal ground-fault detection
(residual current monitoring)
✓
(Selectable)
•
Provides optimum protection of loads against high-resistance short circuits
or ground faults due to moisture, condensed water, damage to the insula-
tion material, etc.
• Eliminates the need for additional special equipment
• Saves space in the control cabinet
• Reduces wiring overhead and costs
Blocking current monitoring
✓
(Selectable)
• Minimizes heating of three-phase motors when blocked during operation
through immediate disconnection
• Minimizes mechanical loading of the system by acting as an electronic
shear pin
Operating hours counter
✓
• Gives the time during which there was a measurable current in
at least 2 current paths
•
As an indicator for upcoming maintenance or replacement of machine and
system components
Operating cycles counter
✓
•
Is incremented by one each time a breaking operation is detected, in other
words a transition from three-phase current flow to no measurable current
flow
• As an indicator for upcoming maintenance or replacement of contact
blocks
W
H
D
© Siemens AG 2016