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Circuit breaker arc chute contractor covers are medium-density asbestos cement sheet on a metal backing.
Ex-Electricity Commission circuit breakers usually have silver-coloured box covers that don’t contain asbestos.
They are sometimes called ‘closing coil contractor covers’ and are found in:
Westinghouse 11kV J18/B18 family of circuit breakers. These covers contain friable asbestos. They are high risk if touched or disturbed.
South Wales 11kV DX4 breakers and 33kV GCN breakers. These covers are bonded and may contain non-friable asbestos. They are low risk.
Residential, Commercial, Industrial, Community infrastructure and spaces
Electrical and power boxes, Plant and machinery
Arc Chute Covers, Closing Coil Contractor Covers
Asbestos is more likely to be found in pre-1965 breakers which have square box contractor covers the same colour as the rest of the circuit breakers.
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Three circuit breaker covers. Credit: Asbestos and Hazardous Materials Consultants Association Members
