A reed switch consists of two ferromagnetic and specially shaped contact blades (reeds) positioned in a hermetically sealed glass tube with a gap between them and in a protective atmosphere. The plated contact surfaces are isolated from the outside environment, which protects the contacts from contamination.

Reed switches are available as form A (normally open) and form C (changeover), and are operated using a magnetic field generated by either a permanent magnet or current-carrying coil. The features that make the reed switch a valuable tool include compact size, low weight, quick response time, long life (nominally 50 million operations) and low cost. Some common applications are: reed relays, automotive sensors, robotics sensors, security sensors and toys and games. They are also available in moulded packages affording protection from damage and in surface mount styles.

 

Reed Switches - Form A / C - Wetted Contact

Serial Number	Details	Product	PDF
HG07120180	Contact Form: D Switching Capacity:250 W/VA resistive load Switching Voltage: 500 Vdc/ac peak - resistive load Switching Current: 5 Adc/ac peak - resistive load Glass Length: 42.0mm (1.65in) Diameter: 8.2mm (.32in)
HGW083060	Contact Form: C Switching Capacity: 100 W/VA resistive load Switching Voltage: 500 Vdc/ac peak - resistive load Switching Current: 2 Adc/ac peak - resistive load Glass Length: 20.4mm (.80in) Diameter: 5.2mm (.205in)
HGZ	Contact Form: C Switching voltage: 500 Vdc/ac Peak - Resistive Load Switching current: 2.0 Adc/ac Peak - Resistive Load Carry Current: 3.0 Adc/ac Peak - Resistive Load Switching Capacity: 50 Wdc/ac Peak - Resistive Load Glass Length: 0.571in (14.5mm) Diameter: 0.1in (2.54mm)
MH4	Contact Form: A Switching voltage: 500 Vdc/ac Peak - Resistive Load Switching current: 2.0 Adc/ac Peak - Resistive Load Carry Current: 3.0 Adc/ac Peak - Resistive Load Switching Capacity: 50 Wdc/ac Peak - Resistive Load Glass Length: 0.524in (13.3mm) Diameter: 0.098in (2.5mm)
MH5	Contact Form: A Switching voltage: 500 Vdc/ac Peak - Resistive Load Switching current: 2.0 Adc/ac Peak - Resistive Load Carry Current: 2.0 Adc/ac Peak - Resistive Load Switching Capacity: 50 Wdc/ac Peak - Resistive Load Glass Length: 0.433in (11.0mm) Diameter: 0.098in (2.5mm)