Wire Harness & connector available also
Relay Pin configuration
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 a projector turns on it has a 12V signal to let different accessories know it's on. 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 or coil. A solenoid 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 75 milliamps. The switched output can be as high as 20 amps or more. One very useful use of a relay is to control a high current device such as a linear actuator motor with a low current signal, such as a projector or home theater controller. Another common use for relays is to separate control voltage from motor voltage. This is useful when you've got a control voltage of 12V and you want to control a linear actuator running on 36V, such as controlling the track actuators with the 4CH-RC (some wiring required)
Relay at rest
The terminals of a relay are defined as follows:
30 is the common or input voltage (or ground) to be switched.
87a is the normally closed connection (can be used as a switched voltage output when the relay is at rest). (This terminal offers no voltage when the relay is energized.)
87 is the normally open connection (switched voltage output when the relay is energized).
85 is connected to the ground of the triggering voltage.
86 is connected to the positive 12V of the triggering voltage.
Note: in many cases, the connection of pins 85 and 86 can be interchangeable.
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 electronics in general. Firgelli Automations is not responsible for any damages sustained from mishandling of products or incorrect interpretation of this information.