Relay use affects, and relay arcing can accelerate, the end-of-life of a relay. For more detailed information about relay life and arcing, refer to the NI Switches Help. To determine the expected life of your relay, refer to the specifications document for your switch module.

To determine if you need to replace a relay, monitor the relay count of your switch module in the Relays Tab of the SFP window. If you have switched a relay beyond its expected life or it has sustained excessive arcing, refer to Replacing a Relay.