Relay internal functions

[tablerock]

Need to know the internal functions of the common 911 electrical relay(30-85-86-87).Thanks.

[Bill Verburg]

30 is battery positive voltage
87 is a relay actuated contact
86 is the coil control voltage
85 is coil ground

[911pcars]

Here's typical Bosch DIN relay, 1 make, 1 break type. 87a is typically not included on the round relays; used to break a circuit when the relay is energized. Othewise, the function is the same.



86 is also source voltage. When switched, it energizes the magnetic coil in the relay, then to ground.

Sherwood