Relays FAQs

Q	How can I tell what relay I need?
A	You can try to identify a relay by the number of terminals or by checking the internal circuit schematic.
Q	What do NO and NC mean with reference to relays?
A	Normally Open (NO) means the high current contact is open with the relay at rest (i.e. no power applied to the coil) and closed when the relay coil is energised. A Normally Closed (NC) relay is the opposite. Normally Open relays are the more common type.
Q	How much energy will the coil draw?
A	A relay coil typically draws a very small current somewhere in the region of 100-300 mA, making them ideal for use with low current switches to turn a higher current circuit on and off.

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Disclaimer - The information contained in these articles is provided in good faith and we do our best to ensure that it is accurate and up to date, however, we cannot be held responsible for any damage or loss arising from the use or mis-use of this information or from any errors or omissions. The installer is ultimately responsible for the safety of the system so if you are in any doubt, please consult a qualified electrician.

Relays FAQs

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