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brulaz's avatar
brulaz
Explorer
May 27, 2015

Shore/Inverter Wiring for 120VAC DPDT 30A relay

Thinking about using this (NTE R04-11A30-120) to auto switch between shore power and inverter power. One pair of contacts is Normally Closed (NC), the other NO. The relay coil is 120V (10VA Nomi...
MEXICOWANDERER's avatar
MEXICOWANDERER
Explorer
May 27, 2015
The NC contacts do not have equal ampacity as the NO contacts. Spring versus magnetic coil. The coil wins for strength. I used a pair of 30-amp open frame relays on a 30-amp circuit. I check contact current ratings via their rated voltage. 480 or 240 rated 30 amp contacts can carry more than 30-amps. This helps with the NC ampere rating.

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