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Two overlapping blades inside a small capsule outline.
Also known as: Reed contact, Magnetic reed switch, Sealed contact switch, Blades in a capsule
A reed switch closes when a magnet comes near, and its contacts are sealed inside a glass capsule — which is why it works underwater and in dust, and why it fails permanently if the glass breaks. The capsule outline in the symbol is the sealed envelope.
Denotes a reed switch: ferromagnetic contact blades sealed in an envelope, closing in the presence of a magnetic field.
Contexts: Electrical equipment
Is drawn with the contact blades enclosed in an outline representing the sealed capsule, which is what distinguishes it from an ordinary contact.
Contexts: Electrical equipment
Operates without power and without contact with the actuating magnet, which is why it is the standard door and window sensor in alarm systems.
Contexts: Electrical equipment
Two short overlapping straight blades enclosed in an elongated oval or rounded rectangle outline, with a lead from each end.