Siemens Low Voltage Power Circuit Breaker WLL2S308

DANGER: Hazardous voltage. Will cause death, serious personal injury, or equipment damage. Turn off and lock out all power supplying this device before working on this device.

WARNING: High speed moving parts. Can cause serious personal injury. Discharge the closing spring before inspection and before carrying out any work on the circuit breaker.

Circuit breaker opened and closing spring discharged

Circuit breaker moved into the withdrawn position in the cradle

Arc splitter plates inspected for erosion

Arc splitter plates show signs of heavy wear (severe erosion, large deposits of molten metal, etc)

Circuit breaker's internal contacts replaced

Sign off on the arc chute check

Place circuit breaker in an upright position

Press and hold the contacts together

Unscrew the main shaft retainer

Charge closing spring of circuit breakers to be interlocked

Test the various possibilities of the planned interlocking configuration one after the other

Re-adjust Bowden cables if necessary

Discharge the closing spring of the circuit breakers to be interlocked

Note: The following maintenance points must be followed:

The adjustment of the Bowden cables needs to be checked after the first 100 switching operations and must be readjusted if necessary.

The adjustment of the interlocking device needs to be checked and, if necessary, readjusted every 1000 operations or at least once every year.

Warning: Ensure to strip off the driving collar of the spring dump mechanism when extracting the racking shaft (page 23-21).

Racking shaft pulled out on the other side

Sign off on the racking shaft removal

Charge the closing spring manually