Open load switch common faults and treatment methods

one,

Failure phenomenon :

After closing, the switch is open in one phase or two phases

possible reason:

(1) The static contact elasticity disappears, the opening is too large, resulting in poor contact between the moving and static contacts

(2) Fuse blow or virtual connection

(3) Oxygen or static contact oxidation or dust

(4) Poor contact in the switch incoming or outgoing line head

Treatment method:

(1) Trimming or replacing the static contact

(2) Replace the fuse or fasten

(3) Cleaning the contacts

(4) Reconnect

two,

Failure phenomenon :

After the switch is closed, the fuse is blown

possible reason:

(1) External load short circuit

(2) The melt size is too small

Treatment method:

(1) Eliminate the load short circuit fault

(2) Replace the melt as required

three,

Failure phenomenon :

Contact burnout

possible reason:

(1) Switch capacity is too small

(2) The pulling and closing actions are too slow, causing the arc to be too large and burning the contacts.

Treatment method:

(1) Replacement switch

(2) Trimming or replacing the contacts and improving the operation method