How long is the life of a relay if it is continuously energized and used?
Specific life is not defined when the product is continuously energized; there is no guaranteed value.
Continuous energization may cause the coil, which uses polyurethane copper wire, to generate heat. Since a single wire generally has a heat-resistant life of 40,000 hours, the life will be approximately 5 years when a rated voltage is applied and used in a standard environment.
For more information, see Safty Precautions for All Relays: 1-2 Selecting Relays/Drive Circuits.
For example, when a relay is used in a circuit that is continuously energized for a long period of time without switching operation (emergency light or alarm equipment or error check circuit that releases only when an error occurs and issues an alarm at the b-side contact), a de-energized design is desired.
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