Tongue Switch with Guard Locking IDEM SEZYLOCK KLP-P2L. The KLP-P2L Series Guard Locking Switches have a slim plastic body design and have been developed with a holding force of 1800N (180kg) to keep medium Guard Doors closed until hazards have been removed.They are Power to Lock - Spring to Unlock - suitable for applications where immediate unlocking is required at removal or loss of power. They are NOT suitable for machines with a running down ..