Siemens Low Voltage Power Circuit Breaker WLS2A320

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 a qualified person?

Is the power supplying this device turned off and locked out?

Is the closing spring discharged?

Is the worker familiar with the installation, construction and operation of the equipment and the hazards involved?

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?

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.

It is recommended that the arc chutes be inspected on a regular basis.The arc splitter plates erode as the result of load breaking. This constitutes normal wear. The erosion of the arc splitter plates can manifest itself as wear of the plates, a layer of soot, or small spots of collections of molten metal. In case of heavy wear (severe erosion, large deposits of molten metal, etc), the circuit breaker should be replaced.

It is also necessary to replace the arc chutes when the circuit breaker's internal contacts are replaced. See Checking contact erosion (page 23-10) for evaluation of contact wear, and Replacing the circuit breaker internal contact assemblies (page 23-11) for internal contact replacement.

Will cause death, serious personal injury, or equipment damage.

Turn off and lock out all power supplying this device before working on this device.

Can cause serious personal injury.

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.

Powder-coated inner sides of the covers not burned

No damage on the inner side of the cover

Upload a photo of the arc chute cover

Sign off on the arc chute cover inspection

Warning: Mishandling may lead to broken insulation plates of the arc chute housing, and compromised insulation capacity.

Loosen screw by approx. 15 mm; do not remove it; FS III and FS II, class C: remove screw completely

Push the cover back; FS III: lift the cover carefully

Do not stand arc chutes up, when placing them on a table, or any other surface outside of the circuit breaker. The arc chutes should be placed on their side to prevent breakage of the insulation plates.

Sign off on the arc chute removal