What type of relay is typically sealed in a glass capsule?

A reed relay is typically sealed in a glass capsule to protect its internal components and ensure reliable operation. This design consists of two ferromagnetic reeds placed close together within the glass envelope. When a magnetic field is applied, the reeds come together, completing the circuit. The glass capsule not only provides insulation but also shields the internal mechanism from environmental factors such as moisture, dust, and physical damage. This makes reed relays well-suited for applications requiring high reliability in challenging conditions.

In contrast, the other types of relays mentioned—latching relays, standard relays, and power relays—typically do not utilize a glass capsule for their construction. Latching relays often have a mechanical design that allows them to maintain their position without continuous power, while standard and power relays are designed for different operational requirements but do not generally involve the same encapsulated design.