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A single Form C relay consists of three reed blades; a normal open contact (N.O.), a normally closed (N.C.) contact, and a common (C). This configuration is called a single pole double throw (SPDT) switch. Contact Form E is a bi-stable contact that can exist in either the normally open or normally closed state with no coil power, and is also called a latching relay. This type of relay also uses an internal biasing magnet. Reed relays can have multiples of each form, up to four in a single package.
PTM Published on: 2014-04-10
