Relay Switches Supplied to Aerospace, Marine & Tracked Vehicles by Air & Marine Products

A relay is an electrical switch that opens and closes under the control of another electrical circuit. In the original form, the switch is operated by an electromagnet to open or close one or many sets of contacts. Because a relay is able to control an output circuit of higher power than the input circuit, it can be considered to be, broadly, a form of an electrical amplifier.

Choosing a Relay

When choosing a relay to use, you need to bear in mind properties of both the coil and the switch contacts. You will need to find a relay that has the number of switch poles needed for your application. You then need to make sure that the switch contacts can cope with the voltage and current you intend to use. Also of importance is the material that the switch contacts are made of - gold is good for low-voltages, whereas tungsten is suitable for switching high voltages and currents.

Finally, you need to choose a relay that has a coil that can be energised by your low-voltage control circuit. Relay coils are generally rated by their voltage and resistance, so you can work out their current consumption using Ohm's Law. You will need to make sure that the circuit powering the coil can supply enough current, otherwise the relay will not operate properly.

Please find below the range of relay switches that Air & Marine Products can supply, or contact us for your specific relay requirment.