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A relay is a remote-control heavy duty switch. A very small switch - page 3 / 3

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87

85

86

87a

30

87

86

87a

85

30

Common vehicle relays are represented by the figure at the left. A relay socket looks like the center figure. The figure at right is Jon P’s interpretation of a relay at rest.

87 - N/O - Normally Open - One of the 3 Heavy Duty Terminals, it is connected to 30 when the relay coil is powered on and becomes a magnet

87a - N/C - Normally Closed - One of the 3 Heavy Duty Terminals, it is connected to 30 when the relay is resting, no power to the coil

30 - COMMON - One of the 3 Heavy Duty Terminals, connected to either 87a at rest, or 87 when energized

85 - COIL - One of the 2 connections that feed the coil 86 - COIL - One of the 2 connections that feed the coil

Drawn by Jon Pardue 8-15-2006

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