Product details
Control gear & circuit protection
3RR2 Monitoring relays for 3RT2 contactor mounting - standard version
The SIRIUS 3RR2 current monitoring relays are suitable for the load monitoring of motors or other loads. In two or three phases they monitor the rms value of a.c. currents for overshooting or undershooting of set threshold values.
Whereas apparent current monitoring is used above all in connection with the rated torque or in case of overload, the active current monitoring option can be used to observe and evaluate the load factor over a motor's entire torque range.
The 3RR2 current monitoring relays can be integrated directly in the feeder by mounting onto the 3RT2 contactor; separate wiring of the main circuit is therefore superfluous. Separate transformers are not required.
For a line oriented configuration or simultaneous use of an overload relay, terminal brackets for stand alone installation are available for separate standard rail mounting.
The standard versions monitor the current in three phases with selectable active current monitoring. They have additional diagnostics options such as residual current monitoring and phase sequence monitoring, and they are also suitable for monitoring motors below the rated torque. These devices have an additional independent semiconductor output, an actual value indicator, and are digitally adjustable.
Technical specification
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| Measuring range: | 4-40kA
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| Hysteresis: | 0.1-8A
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| Supply voltage: | 24V a.c./d.c.
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| Size: | S0 |
Benefits:
Directly mountable onto 3RT2 contactors, ie no additional wiring outlay in the main circuit
Optimally coordinated with the technical characteristics of the 3RT2 contactors
No separate current transformer required
Versions with wide voltage supply range
Variably adjustable to overvoltage, undervoltage or range monitoring
Freely configurable delay times and reset response
Display of actual value and status messages
All versions with removable control current terminals
Simple determination of the threshold values through direct reference to
actually measured values for setpoint loading
Range monitoring and selectable active current measurement mean that only one
device for monitoring a motor is required along the entire torque curve
In addition to current monitoring it is also possible to monitor for broken cables,
phase failure, phase sequence, residual current and motor blocking
Application:
Monitoring of current overshoot and undershoot
Monitoring of broken conductors
Monitoring of no load operation and load shedding, eg in the event of a torn V
belt or no load operation of a pump
Monitoring of overload, eg on pumps due to a dirty filter system
Monitoring the functionality of electrical loads such as heaters
Monitoring of wrong phase sequence on mobile equipment such as
compressors or cranes
Monitoring of high resistance short circuits, eg due to damaged insulation or dampness
For details of the 3RT2 S0 contactors CLICK HERE
