Our Unique Technologies Deliver World-Class Quality

Our KOFU reed switch is one of three brands manufactured by Standex Electronics. The KOFU reed switches have extremely high-quality due to our proprietary technologies -- contact surface deactivation treatment, high-performance automatic sealing machines, and contact resistance measurement based on the flux scanning (FS) system. These technologies have earned us the top market share in the World. Also, our broad product line allows the customer to select a product to suit the intended application and purpose, for everything from low-voltage signal lines to high-voltage power lines.

Reed Switch Structure and Principle of Operation

The reed switches comprise two ferromagnetic reeds placed with a gap in between and hermetically sealed in a glass tube. The glass tube is filled with inert gas to prevent the activation of the contacts. The surfaces of the reed contacts are plated with rhodium or iridium.
The reed switch is operated by the magnetic field of an energized coil or a permanent magnet which induces north (N) and south (S) poles on the reeds. The reed contacts are closed by this magnetic attractive force. When the magnetic field is removed, the reed elasticity causes the contacts to open the circuit.

Reed Switch Typical Characteristics

Part no. Contract
Outer dimensions (mm) Features (Contact material)
Glass tube length Glass tube diameter Total length
ORD213 1A 1W 7.0max Ø1.80max 35.8 ± 0.3 Super ultra-miniature (Rh)
ORD311 1A 10W 7.0max Ø1.80max 35.8 ± 0.3 Super ultra-miniature long-life (Ir)
ORD211 1A 1W 10.0max Ø2.0max 35.7 ± 0.3 Ultra-miniature (Rh)
ORD611 1A 10W 10.1max Ø2.1max 35.7 ± 0.4 Ultra-miniature (Ru)
ORD219 1A 10W 12.0max Ø2.00max 44.3 ± 0.3 Miniature high-performance (Rh)
ORD312 1A 30W 12.0max Ø2.00max 44.3 ± 0.3 High-power long-life (Ir)
ORD221 1A 10W 13.0max Ø2.30max 44.2 ± 0.3 Miniature off-set type (Rh)
ORD228VL 1A 10W 14.0max Ø2.20max 44.3 ± 0.3 Miniature high-performance (Rh)
ORD324 1A 10W 14.0max Ø2.20max 44.3 ± 0.5 Miniature type (Ir)
ORD324H 1A 10W 14.0max Ø2.20max 56.7 ± 0.3 Miniature long lead (Ir)
ORD624 1A 10W 14.0max Ø2.20max 44.3 ± 0.5 Miniature type (Ru)
ORT551 1C 3W 14.0max Ø2.54max N.O51.6 ± 0.3
N.C56.1 ± 0.3
Ultra-miniature transfer (Rh)
ORD2211 1A 50W
(12V-3.4W lamp)
16.5max Ø2.80max 44.1 ± 0.3 Lamp load (Rh)
ORD2211H 1A 50W
(12V-3.4W lamp)
16.5max Ø2.80max 57.0 ± 0.3 Ultra-miniature transfer long lead(Rh)
ORD2210V 1A 100W 21.0max Ø2.75max 55.4 ± 0.3 Vacuum, high power (Rh)
ORD229 1A DC50W/AC70W 21.0max Ø2.75max 55.4 ± 0.3 High breakdown voltage (Rh)
ORD2210 1A DC50W/AC70W 21.0max Ø2.75max 55.4 ± 0.3 High power (Rh)