ZORC© high frequency transient surge suppressor

For the protection of medium and low voltage motors, transformers and generators

The ZORC® is a unique high frequency transient surge suppressor that protects your motors, transformers and generators from the destructive surge spike. It also protects against short rise times, large amplitudes and overvoltages. It protects your hardware against voltage transients and circuit switching.

standard version

Ecreteur RC – 1 seule phase

RC clipper – 1 single phase

Advantages :

  • Reduces costs by eliminating production downtime due to insulation failure
  • Protects motors, generators and transformers throughout their useful life
  • Eliminates multiple pre- and re-strikes of no-load transients and associated with other switchgear
  • Standard and intrinsically safe models available
  • Three phase and single phase

Technical data :

  • System voltage: 400 V to 40 kV
  • Transient protection: 0.1 to 0.2 microsecond interval
  • Special compact versions that can be installed in most terminal boxes of
    motor/transformer or switchgear panels

Facility :

ZORC surge suppressors can be installed in any direction (including at

upside down) on the machine side of the motor/generator/medium voltage transformer switch

associated, in the following positions (in order of priority from the point of view of protection against overvoltages)

Preferred Connections of ZORC Surge Suppressors

  • In the motor/generator/transformer terminal box, connect each phase to ground
  • Wired to the motor/generator/transformer terminal box via a three-core cable (25mm minimum), in addition to an earth conductor (according to local regulations)

  • In line with the motor/generator/transformer power cable, the shunt is connected from each phase to the associated generator/transformer ground, connect from each phase to the ground

  • Convenient mounting brackets or flanges are provided

Different versions of ZORC:

standard variants

  • M3-3kV ZORC™ – Medium Voltage
  • M3-4.16kV ZORC™ – Medium Voltage
  • M3-6.6kV ZORC™ – Medium Voltage
  • M3-7.2kV ZORC™ – Medium Voltage
  • M3-11kV ZORC™ – Medium Voltage
  • M3-13.8kV ZORC™ – Medium Voltage
  • M3C-3kV ZORC™ – Medium Voltage
  • M3C-4.16kV ZORC™ – Medium Voltage
  • M3C-6.6kV ZORC™ – Medium Voltage

RC clipper – single phase

  • M1-22kV ZORC™ – Medium Voltage
  • M1-25kV ZORC™ – Medium Voltage
  • M1-33kV ZORC™ – Medium Voltage
  • M1-36kV ZORC™ – Medium Voltage
  • M1-40kV ZORC™ – Medium Voltage

ZORC® product studied for a wide range of applications

  • Compressors
  • Crushers
  • Motor generator sets
  • Conveyors
  • Generators
  • Induction and arc furnaces
  • Pumps
  • Mills
  • Refrigeration machines
  • mine reels
  • Mini and mobile substations
  • Power station auxiliaries
  • Dry type transformers