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Automotive Relays Common Relay Pin Configuration (Bosch-type) Relays are widely used in electrical applications where one circuit is to be energized or turned "on" by the presence of a voltage, provided by another circuit. An example of this is when an automotive radio sends out a triggering voltage to turn on an external amplifier or activate a motorized antenna. Anywhere a switch can go in a circuit, a relay can replace it, (as long as there is a triggering voltage available to activate it). The "switch" in a relay is more often called a solenoid. A solenoids is like a piston that pushes outward when energized with electricity. This push mechanically trips the switch in the relay, completing circuit and allowing the switched voltage output. A relay can be triggered with an electrical pulse as small as 150 milliamps. The switched output can be as high as 30 or 40 amps.
Connections The terminals of a relay are defined as follows:
Note: in many cases, the connection of pins 85 and 86 can be interchangeable, but NOT if there is a diode wired across the coil. Below are several common examples of how relays are commonly used: This information provided as an option to those who wish to use it. It is recommended only to those who have some familiarity with such practices and/or audio electronics in general. Parts Express is not responsible for any damages sustained from mishandling of products or incorrect interpretation of this information. Please refer all questions or concerns to our Technical Staff.
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http://www.parts-express.com/resources/relays.html
Don
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