Reed Switches

STG offers a wide range of reed switches with a glass tube length from 7 to 50 mm.

The capacity range covers switching capacities up to 120 W/VA, switching voltages of almost 0 V to 10 KV AC/DC and switching currents of 0 to 3 A AC/DC.

All reed switches are available as normally closed, normally open or bistable versions.

All variations can be customized to meet individual customer requirements.

Life Expectancy:

The life expectancy of a Reed Switch is about 10⁵...10⁶ switching cycles with maximum power. With a low load the life expectancy can reach 5x10⁸ operations. The mechanical life expectancy can reach at least 10⁹ operations.

Through the switching of inductive, capacitive and lamp loads, the life expectancy is considerably reduced due to exceeding the specified maximum current.

In General:

For all Reed Switches the standard pull-in sensitivity is given in the table.
Other pull-in sensitivities are available on request.

Order example:

For example:

2203.1523.090 is an 1523 ReedSwitch,
with pull-in sensitivity between 90-105AT (90+3*5AT);

2201.1917.065 is an 1917 Reed Switch,
with pull-in sensitivity between 65-70AT (65+1*5AT).

Normally Closed and Bistable Reed Switches:

All Reed Switches are available in a normally closed or bistable version.

Pull In Sensitivity Tolerance:

The given pull-in sensitivity of the Reed Switch has a test equipment tolerance of ± 2 AT.

The materials

used for Reed Switch magnets are generally ALNICO (an aluminium nickel cobalt alloy), a ceramic (barium ferrite or another metal oxide) or rare earth magnets. Due to their specific magnetic characteristics, the types of magnets differ in shape: ALNICO magnets are bar magnets with a length/diameter ratio of 3/1 to 5/1; oxide magnets are generally disc or moulded magnets.

Also important to note is the difference in temperature coefficient: ALNICO: 0.02 %/K, oxide: 0.2 %/K.