The reason and solution of resistance of switch knob of explosion-proof distribution box

 The switch box of explosion-proof distribution box is generally of flameproof structure, and each circuit switch on the box body is composed of knobs, transmission shafts, card slots and miniature circuit breakers with high break.

Switch knob and casing box cover internal circuit breaker closing operation, through the shaft points between the box cover and the shaft smudgy or corrosion, will cause the drive shaft rotation is not flexible. Even when the rotation of the knob torque than circuit breaker tripping moment, in the case of short circuit or overload, leads to a circuit breaker refused to move, make the switch trip at the next higher level, so that power expanded.

Explosion-proof distribution box switch knob jam solution

1. Check the flexibility of the knob regularly to ensure its flexibility and reliability.

2. For knobs with stuck resistance, clean the drive shaft with cleaning agent, and daub appropriate amount of butter on the drive shaft during reloading to lubricate and seal it.