What is a Reed Relay? from Pickering Electronics 

Thanks.

Our Series 109P has a typical contact resistance around 0.1 Ohm and the option of a coax screen to reduce signal noise. For a more detailed answer we would require a bit more information on your application, please feel free to get in contact with our technical support team via techsales@pickeringrelay.com.

A SPDT reed switch, sometimes known as a Form C or changeover, is similar in construction, but with only one blade moving. Both the normally open and normally closed contacts are fixed, and usually both exit at the same end of the glass tube, the opposite end to the common moving switch blade. This normally closed contact is magnetically separated by a small non-ferrous spacer. The moving blade is mechanically biased towards this normally closed contact. When the coil is energised, the moving blade is deflected from the normally closed contact towards the normally open contact, completing the magnetic circuit.For a more detailed explanation with illustrations, please visit Pickering's web site and look at Page 9 of the Reed Relay Mate.www.pickeringrelay.com/relaymate-request/

These are almost as common as standard reed switches, and are available on EBay, etc., as well as the standard sources. Look for "NC" (normally closed) reed switches,as opposed to "NO" (normally open).

Yes Lesley. Unfortunately our Graphics guy was not too good at spelling and it was missed. We did not want to re-submit it and ruin our viewing history.