Pickering Electronics Blog

Understanding Reed Relay Terminology

Posted by Kevin Mallett on Mar 23, 2016 12:30:00 AM


The relay industry has evolved with a set of its own nomenclature that describes the products available, however, not all of these terms are familiar to users. The following blog post seeks to describe and explain these relay terms.


Form A

Form A describes a relay whereby the contact is a simple switch, which is open or closed, and the un-energised position is the open condition. For a single relay this would also be described as a single pole, single throw (SPST) relay with a normally open (NO) contact.

If the relay has multiple contacts in the same package it would be described as having (for example) 2 Form A contacts (DPST).

Pickering has a range of  Form A Reed Relays, for example our Series 109 that are an ideal choice for high density applications, or our high voltage Series 104 for up to 3kV.

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Topics: Reed Relays, Form B, Form A, Form C