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Reed switch
ORD211
ORD213
ORD213S
ORD219
ORD221
ORD228S-1
ORD228VL
ORD229
ORD234
ORD311
ORD312
ORD324
ORD2210
ORD2210V
ORD2211
ORD2212
ORD2220
ORD2221
ORD9215
ORD9216
ORT551
RA-901
RA-903
Pressure sensor
Reed switch
  Oki 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 Japan. 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.
   

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.		 Reed Switch Structure and Principle of Operation

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 Structure and Principle of Operation

The transfer type reed switch is normally ON, due to mechanical bias of the common (COM) lead, which is between the normally closed (N.C) reed contact and the normally open (N.O) reed contacts.		 Reed Switch Structure and Principle of Operation

When an external magnetic field is induced, the N.C blade is not affected because it is non-magnetic but the COM lead is attracted by the N.O lead and moves. When the magnetic field is removed, COM lead again moves to the N.C lead by mechanical bias. Reed Switch Structure and Principle of Operation
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Reed Switch Typical Characteristics
You can download various data of our reed switches in detail, from "Document Download" page.

Part no. Contract type Contact capacity Outer dimensions (mm) Features (Contact material)
Glass tube length Glass tube diameter Total length
ORD213
 1A 1W 7.0max Ø1.80max 35.8 ¡À 0.3 Super ultra-miniature (Rh)
ORD213S-1
 1A 1W 7.0max Ø1.80max 13.0 Super ultra-miniature SMD(Rh)
ORD211
 1A 1W 10.0max Ø2.0max 35.7 ¡À 0.3 Ultra-miniature (Rh)
ORD219
 1A 10W 12.0max Ø2.00max 44.3 ¡À 0.3 Miniature high-performance (Rh)
ORD221
 1A 10W 13.0max Ø2.30max 44.2 ¡À 0.3 Miniature off-set type (Rh)
ORD2221
 1A 10W 13.0max Ø2.30max 56.7 ¡À 0.3 Miniature off-set type long lead(Rh)
ORD228VL
 1A 10W 14.0max Ø2.20max 44.3 ¡À 0.3 Miniature high-performance (Rh)
ORD228S-1
 1A 10W 14.0max Ø2.20max 19.6 ¡À 0.3 Miniature high-performance SMD (Rh)
ORD2220
 1A 10W 14.0max Ø2.20max 56.7 ¡À 0.3 Miniature wide differential (Rh)
ORD229
 1A DC50W/AC70W 21.0max Ø2.75max 55.4 ¡À 0.3 High breakdown voltage (Rh)
ORD2210
 1A DC50W/AC70W 21.0max Ø2.75max 55.4 ¡À 0.3 High power (Rh)
ORD2210V
 1A 100W 21.0max Ø2.75max 55.4 ¡À 0.3 Vacuum, high power (Rh)
ORD2211
 1A 50W (12V 3.4W lamp) 16.5max Ø2.80max 44.1 ¡À 0.3 Lamp load (Rh)
ORD2212
 1A 10W 16.5max Ø2.80max 43.9 ¡À 0.3 Closed differential type, low sound (Rh)
ORD234
 1A 10W 21.0max Ø3.50max 43.4 ¡À 0.3 Long-life (Rh)
ORD9215
 1A 10W 17.0max Ø2.80max 44.1 ¡À 0.5 General purpose miniature-type (Rh)
ORD9216
 1A 10W 14.0max Ø2.20max 44.3 ¡À 0.5 General purpose miniature-type (Rh)
ORT551
 1C 3W 14.0max Ø2.54max N.O51.6 ¡À 0.3
N.C56.1 ¡À 0.3		 Ultra-miniature transfer (Rh)
ORD311
 1A 10W 7.0max Ø1.80max 35.8 ¡À 0.3 Super ultra-miniature long-life (Ir)
ORD312
 1A 30W 12.0max Ø2.00max 44.3 ¡À 0.3 High-power long-life (Ir)
ORD324
 1A 10W 14.0max Ø2.2max 44.3 ¡À 0.5 High-power long-life (Ir)
RA-901
 1A 10W 2.5 ¡À 0.1(W) 2.5 ¡À 0.1(H) 19.5 ¡À 0.2(L) Miniature SMD (Molded type)
RA-903
 1A 1.0W 2.1 ¡À 0.1(W) 2.1 ¡À 0.1(H) 12.3 ¡À 0.2(L) Ultra-miniature SMD (Molded type)
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