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Load guard RP81

  • Load guard for 3-phase motors
  • Power factor metering
  • Adjustable time delay 0-20 sek. at motor start
  • Selectable release of relay at max. or min. load
  • 1-pole relay output 8A / 250 VAC

Product description

C-mac® module type RP81 is used for load monitoring of 3-phase motors, as the phase angle (cos ­) between motor current and -voltage changes in proportion to the mechanical load of the motor. You will see the biggest change in phase angle, if the motor is loaded between 0 and 60% of nominal load, which makes the RP81 suitable for monitoring of V-belts, pumps running dry, etc.


RP81 can be connected directly to motors with nominal current up to 6 A. If the current is bigger, you use a standard current transformer .




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Approvals CE
Depth 74 mm
Frequenze 40-70Hz
Height 76 mm
Materials Cover Noryl
Measuring Range 0,5-6A
Power supply V AC 400 V AC
Temperature range from -20 °C
Temperature range to 60 °C
Time Delay Start 0-20 s
Weight 110 g
Width 38 mm

Measurements and connections


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