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Question
How does a forcibly guided contact work?
Answer
If an NO contact becomes welded, all NC contacts will maintain a minimum distance of 0.5 mm when the coil is not energized. Likewise if an NC contact becomes welded, all NO contacts will maintain a minimum distance of 0.5 mm when the coil is energized.
Refer to the following diagram.
The forcibly guided contact mechanism is a requirement of EN 50205 for Safety Relays.
Class A Safety Relays (i.e., all contacts are forcibly guided contacts) have the mark(*) on the nameplate.
Forcibly Guided Contact Mechanism (G7SA Safety Relays)
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