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Would a relay that's meant for mains AC work for 13.5VAC? If not, what type of component/circuit would be best suited for this application? This is meant for a door buzzer/opener that functions on 13.5VAC. Thanks.

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  • \$\begingroup\$ Do you mean the coil, or switching the voltage on the contacts? \$\endgroup\$ – Ron Beyer Sep 18 '19 at 15:51
  • \$\begingroup\$ Which part of the relay ist designed for mains AC? Solenoid or contacts? I assume the solenoid. If so, you can safely test without risking any damage. \$\endgroup\$ – Ariser - reinstate Monica Sep 18 '19 at 15:53
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If the coil is designed for 120/240VAC, it probably won't work if driven with 13.5VAC. If you're driving the coil as specified and the contacts are rated for 120/240VAC, they'll switch a 13.5VAC signal without any problem.

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  • \$\begingroup\$ The relay I'm thinking of is driven by 5VDC for switching 120/240VAC. \$\endgroup\$ – TStef Sep 18 '19 at 16:09
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    \$\begingroup\$ please add this information to your question \$\endgroup\$ – jsotola Sep 18 '19 at 16:30

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