CastletEngineering The Solution

Castlet solenoid operated automatic external earth switches have been used in installations across the world, from power stations to glass plants.

They are designed to provide a reliable, safe and cost effective way to earth transformers.

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Earthing Switches


The earth switch is designed to be fail safe with a spring operated return to earth function. The earth position micro switches ensure the transformer rectifier cannot be started with the earth switch in its earth on position. Can be activated by a high CO alarm signal.

Typical Specifications

  • Heavy duty solenoid
  • Fail safe, spring operated return to earth
  • Micro switch operation status
  • Can be designed with interlock facility.
  • Ambient Temperature: –25°C to +40°C.
  • Housed in a weatherproof enclosure to IP65 – NEMA4 protection.

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