Normally closed operation.

Application e.g. limit switches and long cables.

Main benefits comparing to electromechanical relays and opto coupled relays:

- No limited lifetime even with difficult loads, 10 year warranty
- High tolerance against noises
- Guaranteed switching on- and off-levels
- 100 % clear status indication
- Relatively high transient protection
- Extreme reliability
- No need for over dimension of the relay, all values are effective values
- No minimum load requirement