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Key multiplier
Description:

The key multiplier can be operated once the key(s) locking the previous devices in the safety position has(have) been released and introduced as master keys. Then the slave keys can be released from the key multiplier allowing the maintenance personnel to access the high voltage compartment also equipped with safety door locks. This safety interlocking philosophy based on key locks enable the highest safety conditions for the maintenance operations. The key multiplier can integrate up to 8 keys.

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Secheron Key multiplier safety device
Earthing switches and safety philosophy leaflet
Earthing switches and safety philosophy