Electrical Supplies
Isolating Switches (I.S)
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- Switch-disconnectors used for isolation duty, providing a visible, lockable isolation gap upstream of equipment being maintained. They carry and withstand rated current but are not intended to make or break it, so they are always operated after the load has been switched off by a breaker or load switch.
Application
Fitted ahead of motors, control panels and plant items so a safe isolation can be locked off and proved before work starts. The lockable handle and the visible break are the point: an isolator that cannot be padlocked in the open position does not satisfy a permit-to-work procedure, no matter how the circuit is actually wired.
Standards & Reference 5 cited
IEC/EN 60947-1
The general rules underneath every piece of low-voltage switchgear and controlgear: definitions, ratings and the test conditions the product-specific parts build on.
IEC/EN 60947-3
Switches, disconnectors, switch-disconnectors and fuse-combination units: the devices that isolate a circuit safely rather than protect it.
IEC 60529
The IP code. Two digits stating how well an enclosure keeps out solid objects and water, IP65 and the like. The number a specifier reads first when equipment sits outdoors or in a plant room.
KEMA-KEUR
Independent Dutch product certification, a long-standing mark of tested electrical safety in European specifications.
CCC
China Compulsory Certification: the mandatory safety mark for products placed on the Chinese market.
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