MK2 Series (2/2,2/3)

MK2- Series

MK2/2 – MK2/3 Magnet Bridging Sensor for security applications


These proximity switches operate when in the presence of magnetically conductive material. Instead of an actuating magnet, only a simple piece of iron is required to operate the switch – from the front or from above. These sensors are available as form A and form B switches. The standard cable is a 4 – wire round core 4 x 0.14 mm² (cable sheath and wires are white) forming a sabotage loop.


Door and window control

Opening recognition control

Fastening bolt control

Building BUS technology

Fire protection doors


Tolerance +/- 0.10mm (0.004 inch)

Dimension Drawing


The standard termination is a four-wire UL-approved round cable with a cross section of 4 x 0.14mm²; white colored cable sheath and wires with integrated sabotage loop. The standard cable length is 500mm, other lengths can be supplied on request. The required length has to be stated in the part number. The cable end can be supplied with the following connection styles (please note after the length in the part number).

W Cable end cut, dismantled on 30 mm, cores stripped and tinned on 5 mm 


Contact Data

Contact type 71 90
Contact form A/dry B/dry
Rated Power max. (W) 10 3
Switching voltage max. (VDC) 180 175
Switching current max. (A) 0.5 0.25
Carry current (A) 1.0 1.2
Contact resistance max. mOhm 150 150
Breakdown voltage (contact/contact) min. (VDC) 210 200
Operating time incl. bounce (ms) 0.5 0.7
Releasing time (ms) 0.1 1.0
Operating temperature (°C) -20/+85 -20/+85
Storing temperature (°C) -35/+85 -35/+85

Other switches by request.

Arrangement Example

The switching distance can be decreased by mounting the MK2/2 on iron. When mounting the sensor, magnetically conductive screws must not be used.
MK2/2Operation from the front
The MK2/3 must not be mounted on iron. When mounting the sensor, magnetically conductive screws must not be used.
MK2/3Operation from above

Sabotage Loop

Order information

Ordering example

MK2/2 – 1A71 – 500 W

MK2/2 Reed Sensor, 1 form A switch type 71, Cable length 500mm, Termination W

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