Siemens Low Voltage Power Circuit Breaker WLS2A316

Charge the closing spring manually

Charge closing spring of circuit breakers to be interlocked (page 6-4)

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 (page 23-2)

Note: The following maintenance points must be followed:

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

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

3 During the inspection, the Bowden cables have to be checked against kinks and abrasions, split wires of the exposed steel cable, damage to the cable housing and the adjustment unit (tube setting with thread and nut) and have to be readjusted if necessary. In addition, the movability of movable parts of the interlocking device in their bearings needs to be examined.

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

Only qualified personnel should work on this equipment, after becoming thoroughly familiar with all warnings, safety notices, and maintenance procedures contained herein and on the devices.

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.

Is the worker trained and authorized to energize, de-energize, clear, ground and label circuits and equipment in accordance with established safety practices?

Is the worker trained in the proper care and use of protective equipment in accordance with established safety practices?

Is the worker trained in administering first aid?

Is the circuit breaker in good condition?

Number of operations performed on the circuit breaker

Has the circuit breaker been inspected after breaking heavy current?

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

Lay circuit breaker on its side

Sign off on the current sensor removal