# Relay Failure Analysis


Relay is an electromagnetic device which is used to isolate two circuits electrically and connect them magnetically. They are very useful devices and allow one circuit to switch another one while they are completely separate. They are often used to interface an electronic circuit (working at a low voltage) to an electrical circuit which works at very high voltage.


## Pages

- [Failure Analysis on RY4S-UAC110-120V Power Relay](https://gideonlabs.com/posts/failure-analysis-on-ry4s-uac110-120v-power-relay/index.md)
- [Coto 9202 Surface Mount Relay](https://gideonlabs.com/posts/coto-9202-surface-mount-relay/index.md)
- [NEC Inverter Board](https://gideonlabs.com/posts/nec-inverter-board/index.md)
- [Relay Contamination](https://gideonlabs.com/posts/relay-contamination/index.md)
- [Liquid Contamination on Relays](https://gideonlabs.com/posts/liquid-contamination-on-relays/index.md)