TeSys Giga circuit-breakers

Circuit-breakers, coordinated with TeSys Giga contactors, to protect motors up to 500 A (250 kW / 400 V)

Part of TeSys

Formerly named "TeSys GV5/GV6", TeSys Giga circuit-breakers protect large electric motors from overloads, short-circuits, phase unbalance and phase-loss faults.

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TeSys Giga circuit breakers are specifically designed for demanding motor control and protection applications.

  • 4 current ratings: 150A, 220A, 320A & 500A.

  • 2 breaking capacities (Icu): 36kA & 70kA @ 400/415V AC.

  • Ics = 100% Icu.

  • Equipped with advanced Micrologic trip unit which provides over-load and short circuit protection along with phase-unbalance or phase-loss protections.

  • Adjustable overload protection (Ir): 50..100% x In, includes trip class selection (Class 5, 10 or 20).

  • Adjustable Short-time protection threshold (Isd): 5…13 x In with fixed time delay.

  • Short-Circuit instantaneous protection (Ii): 15 x In (max rating of the trip unit).

  • Front LED indications: Green LED for pre-alarm before event of fault and Red LED for motor operation.

  • Suitable for isolation, as per IEC standards.

  • Control by direct rotary handle as standard, by door-mounted extended rotary handle as option.

  • Wide range of auxiliaries for control and additional protection.

  • Connections: busbars/ cables with lugs.

  • Compliance with standards: EN/IEC 60947-1; IEC 60947-2; IEC 60947-4-1; UL 60947-4-1; CSA C22.2 No 60947-4-1.

  • Optional Thermal Fault module (SDTAM) to indicate over-load and to open contactor (before breaker tripping) in event of over-load or phase un-balance.

  • Choice or type 1 or type 2 short-circuit coordination, when combined with TeSys Giga contactors.


  • An ingenious alliance of advanced electronics and electromechanical technology, TeSys Giga motor circuit-breakers provides more effective protection, and is ideal for demanding applications.

  • Complies with international standards: IEC, UL, EAC (pending) with CE marking, suitable for multi geographical locations.

  • Easy installation thanks to universal fixing arrangement: Screw fixing.

  • Highly reliable as the thermal elements include automatic compensation for ambient temperature variations.

  • Wide range of accessories and auxiliaries provide flexibility.


TeSys Giga circuit breakers provide motor control and protection for a wide range of applications across industry, infrastructure and building. Specific applications include:

  • Commercial real estate, construction, hospitals, facilities.

  • Utilities, oil & gas, energy, Water and Waste Water treatment plants.

  • Machinery, material handling, mining & metals, processing plants, etc..