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Monitoring Relay 4-40kA 24VAC/DC S0

Monitoring Relay 4-40kA 24VAC/DC S0
  Price (ex VAT): £82.85
  Usually within 5 Days
  Order Code: 3RR2142-1AA30
  Manufacturer Code:


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Product details

Control gear & circuit protection

3RR2 Monitoring relays for 3RT2 contactor mounting - basic 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 basic version with two-phase apparent current monitoring, a CO contact output and analogue adjustability provide a high level of monitoring reliability especially in the rated and overload range.

Technical specification
Measuring range:4-40kA
Hysteresis:6.25% of threshold value
Supply voltage:24V a.c./d.c.

  • 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

  • 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