MCCMA31-DC12V-C Automotive Relay, 12 VDC, 30 A, SPDT, Panel, Quick Connect. The MCCMA31-DC12V-C is a panel mount Automotive Relay with plastic sealed enclosure. This CMA31-series relay has 1-form-C SPDT silver alloy contact, standard shoulder, quick-connect terminals and 90Ω coil resistance.