2 PIN TOP RELAY
Why are Protection Devices used in a Relay?
Relays can produce a large voltage spike when they are switched off due to the coil de-energising. Resistors or diodes are sometimes fitted across the coil of the relay to stop/reduce these spikes travelling back into the control circuit and damaging sensitive components. Resistors are more durable than diodes, but not quite as efficient at eliminating voltage spikes. You need to assess the sensitivity of the components in the control circuit when deciding if / what type of protection is required.
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Description
A relay is an electrically operated switch. They commonly use an electromagnet (coil) to operate their internal mechanical switching mechanism (contacts). When a relay contact is open, this will switch power ON for a circuit when the coil is activated.
The example relay diagrams below show how a relay works.Basic relays feature electrical ratings for both the coil and the internal switching contacts. The coil voltage rating is the voltage required for the coil to operate correctly. The switching circuit of the relay also features a voltage and ampere rating. This is the maximum rating of the switch contacts and should NOT be exceeded. Double throw relays often have 2 x switch electrical specifications. One for the normally open terminal, the other for the normally closed terminal. ie. N/O: 35A at 14vdc, N/C: 20A at 14Vdc.
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