In every normally open Form A reed relay there are one or more reed switches that perform the actual switching function. These reed switches are in their natural normally open state. When voltage is applied to the coil of the relay, a magnetic field develops around the reed switch closing the contacts, carrying out its intended switching function. If the customer has an application requiring that the relay remain closed for long periods of time, as is the case for many safety circuits, power will be continuous for that stretch of time. Standex Electronics has developed a normally closed (Form B) reed relay in order to allow extended periods of contact closure while eliminating continuous power draw.