Protection relays

DEIF manufactures a comprehensive range of tested Multiple protection & single-function protection units.

The microprocessor-based, protection integrate maximum protection functionalities as standard and confirms to various global standards and marine class society approvals.

Related Products

Medium Voltage Relay

Medium Voltage Relay MVR-200 series

  • Three phase overcurrent protection stages INST, DT or IDMT 
  • (Sensitive) Earth-fault protection stages INST, DT or IDMT 
  • Harmonic overcurrent protection / inrush blocking stages INST, DT or IDMT 
  • Cold-load pick-up block 
  • Current unbalance / broken conductor protection stages INST, DT or IDMT 
  • Thermal overload protection (line) 
  • Restricted earth fault protection (low-imp) 
  • Cable-end differential protection 
  • Directional three-phase overcurrent protection stages DT or IDMT 
  • Directional (sensitive) residual overcurrent protection stages DT or IDMT 
  • Intermittent earth fault 
  • Fault locator 
  • Overvoltage protection stages INST, DT or IDMT 
  • Undervoltage protection stages INST, DT or IDMT 
  • Positive sequence under/overvoltage protection stages INST, DT or IDMT 
  • Residual voltage protection stages INST, DT or IDMT 
  • Frequency protection stages 
  • Rate of change of frequency 
  • Vector Jump / surge 
  • Reverse/under/over power protection stages INST, DT or IDMT 
  • Synchrocheck  
  • Auto-reclose 
  • Fuse failure 
  • Current transformer supervision 
  • Switch onto fault logic 
  • Breaker failure protection 
  • Programmable stage
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Loss of mains relay

Loss of mains relay LMR-111D

  • Vector shift
  • Detection of vector shift
  • ANSI code 78
  • Mains disconnection on mains failure
  • Ensures no asynchronous reconnection
  • LED indication of fault condition 
  • LED indication for activated relay
  • 35 mm DIN rail or base mounting
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Loss of mains relay

Loss of mains relay LMR-122D

  • Vector shift and df/dt (ROCOF) 
  • Detection of vector shift
  • ANSI code 78
  • Mains disconnection on mains failure
  • Ensures no asynchronous reconnection
  • LED indication of fault condition
  • LED indication for activated relay
  • 35 mm DIN rail or base mounting
More details
Current relay

Current relay RMC-111D

  • Short circuit relay (I>>)
  • ANSI code 50 and 51
  • Measurement of 3-phase currents
  • LED indication of fault condition
  • Timer-controlled tripping
  • LED indication for activated relay
  • 35 mm DIN rail or base mountin
More details
Current relay

Current relay RMC-121D

  • Short circuit and over-current circuit relay (I> + I>>)
  • ANSI code 50 and 51
  • Measurement of 3-phase currents
  • LED indication of fault condition
  • Timer-controlled tripping
  • LED indication for activated relay
  • 35 mm DIN rail or base mounting
More details
Current relay

Current relay RMC-122D

  • Short circuit and over-current
  • I>>: 100 to 400 %, I>: 50 to 150 %
  • Combined functionality
  • Short circuit relay (I>>)
  • ANSI code 50 and 51
  • Measurement of 3-phase currents
  • LED indication of fault condition
  • Timer-controlled tripping
  • LED indication for activated relay
  • 35 mm DIN rail or base mounting
More details
Current relay

Current relay RMC-131D

  • Differential current relay
  • ANSI code 87
  • Measurement of 3-phase currents
  • Non-stabilised measurement
  • LED indication of fault condition
  • Timer-controlled tripping
  • LED indication for activated relay
  • Extra change-over relay contact for signalling
  • 35 mm DIN rail or base mounting
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Current relay

Current relay RMC-132D

  • Double over-current relay (I> + I>)
  • ANSI code 50 and 51
  • Measurement of 3-phase currents
  • LED indication of fault condition
  • Timer-controlled tripping
  • LED indication for activated relay
  • 35 mm DIN rail or base mounting
More details
Current relay

Current relay RMC-142D

  • Earth fault protection at two levels
  • Built-in filter for 3rd harmonic
  • LED indication of fault condition
  • Timer-controlled tripping
  • LED indication for activated relay
  • 35 mm DIN rail or base mountin
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Frequency relay

Frequency relay RMF-112D

  • Combined under-frequency/over-frequency
  • For 1- and 3-phase networks
  • LED indication of fault condition
  • Timer-controlled tripping
  • LED indication for activated relay
  • 35 mm DIN rail or base mounting
More details
Power relay

Power relay RMP-111D

  • Generator and prime mover protection
  • ANSI code 32
  • 3-phase measurement
  • LED indication of alarm condition
  • Timer-controlled tripping
  • LED indication for activated relay
  • 35 mm DIN rail or base mounting
More details
Power relay

Power relay RMP-112D

  • Generator and prime mover protection
  • ANSI code 32
  • 3-phase measurement
  • LED indication of alarm condition
  • Timer-controlled tripping
  • LED indication for activated relay
  • 35 mm DIN rail or base mounting
More details
Power relay

Power relay RMP-121D

  • Generator and prime mover protection
  • ANSI code 32
  • 3-phase measurement
  • LED indication of alarm condition
  • Timer-controlled tripping
  • LED indication for activated relay
  • 35 mm DIN rail or base mountin
More details
Loss of Excitation Relay/Over-excitation Relay

Loss of Excitation Relay/Over-excitation Relay RMQ-111D & RMQ-121D

  • Generator under-excitation protection
  • ANSI code 40
  • Single-phase measurement
  • Timer-controlled tripping
  • LED indication of fault/activated relay
  • 35 mm DIN rail or base mounting
More details
Voltage relay

Voltage relay RMV-112D

  • Under- and over-voltage.
  • U>: 100 to 120 %, U<: 80 to 100 %.
  • Under-voltage/over-voltage (U< + U>)
  • ANSI code 27 and 59
  • 3-phase measurement
  • LED indication of fault condition
  • Timer-controlled tripping
  • LED indication for activated relay
  • 35 mm DIN rail or base mounting
More details
Voltage relay

Voltage relay RMV-122D

  • Over-voltage (double).
  • U>: 100 to 120 %,U>: 100 to 120 %.
  • Under-voltage/over-voltage (U< + U>)
  • ANSI code 27 and 59
  • 3-phase measurement
  • LED indication of fault condition
  • Timer-controlled tripping
  • LED indication for activated relay
  • 35 mm DIN rail or base mounting
More details
Voltage relay

Voltage relay RMV-132D

  • Under-voltage (double).
  • U<: 80 to 100 %, U<: 80 to 100 %.
  • Under-voltage/over-voltage (U< + U>)
  • ANSI code 27 and 59
  • 3-phase measurement
  • LED indication of fault condition
  • Timer-controlled tripping
  • LED indication for activated relay
  • 35 mm DIN rail or base mounting
More details
Voltage relay

Voltage relay RMV-142D

  • Under- and Over-voltage.
  • U>: 100 to 120 %, U<: 80 to 100 %.
  • Single phase measurement.
  • Under-voltage/over-voltage (U< + U>)
  • ANSI code 27 and 59
  • 3-phase measurement
  • LED indication of fault condition
  • Timer-controlled tripping
  • LED indication for activated relay
  • 35 mm DIN rail or base mounting
More details