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A latching relay can maintain the contact even if the voltage applied to the relay coil is turned off. Latching relays can be either single-winding or double-winding.

The holding force (coercive force) of a latching relay may decrease over time, and the set state may be released due to a decrease in the holding force. The decay rate with respect to the elapsed time depends on the surrounding environment. Refer to “Attenuation of holding force” data.

Possible causes differ for AC relays and DC relays. Refer to Explanation for details.

It is possible that a release failure may have been caused by factors of the relay and the circuit that drives the relay?

Since power relays consume more coil power and have higher contact ratings than signal (communication) relays, they are easily affected by heat between relays in close mounting. They must be mounted at certain intervals.

The conditions are different from those for relays for PCB. Perform soldering based on the reflow soldering in the Explanation.

Relay burnout may have been caused by overcurrent, overvoltage, vibration, or short circuit. (It does not mean that the relays burn continuously with flames, because flame-retardant materials are used for the relay components.)

When operating with a microload, use the applicable load condition of the failure rate P level (reference value) as a guide.

For soldering conditions of surface mount relays, refer to “Automatic mounting of relays for PCB,” surface mount relays in “Safety precautions for all relays.”

Please refer to Explanation about manual soladering for our relays.