Failure

Applications

Failure

Causes and Countermeasures for Main Switch Failure

Failure Assumed cause Countermeasure
Failure in electrical characteristics Contact failure Foreign matter is attached to the contacts. Use sealed switches to prevent the entry of foreign matter.
Films forming on contact surfaces Use switches with gold contacts, which have wiping effects.
Insufficient contact force between the contacts caused by an incorrect stroke. Set a suitable stroke.
Malfunction Contact chattering caused by vibration or shock. Use switches with large contact forces between the contacts (i.e., with a high operating force (OF)).
Welding The switching capacity of the contacts was exceeded. Use a high-capacity switch.
Insert a contact protection circuit.
Insulation deterioration The contacts are spattering due to arcing. Use a high-capacity switch.
Failure in mechanical characteristics Failure to operate The mechanism is damaged due to an incorrect stroke, overload, or shock. Set a suitable stroke and operate the switch at a suitable operating speed and with a suitable load.
Foreign matter has entered the switch and is caught in the mechanism or contacts. Use sealed switches to prevent the entry of foreign matter.
External damage An overload was placed on the actuator because of the dog or cam shape or because an unsuitable operating method was used. Change the design of the dog or cam and use suitable operating methods.