The VSD electromagnetic safety door switch keeps a guard locked until the machine is genuinely safe, then releases it on command. A solenoid with 1300 N of holding force blocks the operation key, and the door monitoring contacts stay closed until the tongue is fully inserted, so the sequence is mechanical rather than logical. With 2, 4 and 6 contact groups, twelve 4-group contact arrangements, a green pilot lamp and an emergency release, one series covers interlocked doors on
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