Proof tools

Proof tool material is copper alloy,  mcb circuit breaker  thermal conductivity due to copper and almost no carbon qualities, the tool and the object friction or impact, the short time is absorbed and the heat conduction, another reason because copper itself is relatively soft,  circuit breakers and collisions have a good  Circuit breaker  and difficult to produce tiny metal particles, so we could barely see the spark proof tools therefore also known as non-sparking tools.