UniGear ZS2 (ABB Technology)

UniGear type ZS2 (ABB Technology) is the switchboard version made for applications 36 kV.

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UniGear type ZS2 (former Unisafe 36) is a medium voltage, metal-clad switchgear suitable for indoor installations. It is a modular apparatus made of aligned standard units. Metal sheets segregate each compartment and the energized components are air insulated.

All the startup, maintenance and service operations can be carried out from the front of the unit. The switchgear and the earthing switches are operated from the front with the door closed. The switchgear can be wall-mounted. The range of apparatus available for UniGear ZS2 switchgear is the most complete on the market, including vacuum and gas circuit-breakers.




Description and characteristics

  • Metal-clad air insulated switchboard
  • Designed for medium voltage distribution
  • Factory-tested for indoor installations
  • Arc-proof switchboard
  • Earthed metallic partitions between compartments
  • Mechanical safety interlocks
  • Compartments made of pre-galvanized steel sheets
  • Front access for installation, maintenance and routine operations
  • Conventional instrument transformers
  • Wide range of functional units for any installation requirement
  • Easy-to-assemble modular structure


Ambient conditions
The switchboard ratings are guaranteed under the following ambient conditions:

Minimum ambient temperature         -5 °C
Maximum ambient temperature   +40 °C
Maximum relative humidity   95%
Maximum altitude   1000 m


Electrical characteristics of the switchgear

Rated voltage kV 36
Rated insulation voltage kV 36
Power frequency withstand voltage kV 70
Lightning impulse withstand voltage kV 170
Rated frequency Hz 50-60
Main busbar rated current A 3150
Rated current of the branch connections A Up to 2500
Rated short-time withstand current (3s) kA 31.5
Rated peak withstand current kA 80
Arc proof withstand current (1s) kA 31.5


Protection degrees
The protection degrees in compliance with IEC Standards are the following:

  • External housing: IP4X
  • Inside the units: IP2X.