# Potential-free contact

A relay contact with no voltage of its own, used to pass an alarm signal to another system.

## Sources

- [Ultra Controlo, Medical gas answers: glossary](https://www.ultracontrolo.com/medical-gas-answers#term-potential-free-contact)

Reviewed: 2026-10-22. Ultra Controlo engineering. https://library.ultracontrolo.com/glossary/potential-free-contact/