The R50-E2Y1-12 part of MEC relays is a 50A 2 changeover, 2 pole, 12V DC relay. It is a type 2 changeover relay, meaning it has two different outputs, each with its own set of contacts. It has two separate sets of contacts, one for normally open (NO) and the other for normally closed (NC). This type of relay is commonly used in automotive control applications, such as in switch-controlled lights, power windows, and alarms. The relay is rated for 50A continuous current and 12V DC operation.