MK2 Series (2/4)

MK2- Series

MK2/4 Magnetically operated Reed Sensor with round cable for screw fastening


MK2/4 sensors are magnetically operated Reed proximity switches designed for screw montage. The sensor should be mounted on a fixed surface with the actuating magnet on the moving surface. The Reed Sensor and the magnet must be fixed in a definite distance to each other. Approximation resp. removal of the magnet determines the closing and opening of the Reed Switch. The magnetic pull-in / drop-out sensitivity is divided into five AT ranges.


Door and window control

Position and end switch sensing

Machinery industry


Tolerance +/- 0.10mm (0.004 inch)

Dimension Drawing


The standard termination is a two-wire UL-approved round cable with a cross section of 2 x 0.35mm². 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
X Individual crimped terminals 1mm(0.04inch) diameter
Y Individual spade terminals, 2.8 x 0.8mm(0.11 x 0.03inch)


Contact Data

Contact type 51 71 81 90
Contact form A/dry A/dry A/dry B/C/dry
Rated power max. (W) 12 10 5 3
Switching voltage max. (VDC) 250 1801 90 175
Switching current max. (A) 0.5 0.5 0.5 0.25
Carry current (A) 1.5 1.02 1.0 1.2
Contact resistance max. mOhm 150 150 200 150
Breakdown voltage (contact/contact) min. (VDC) 350 2103 100 200
Operating time incl. bounce (ms) 1.0 0.5 0.5 0.7
Releasing time (ms) 0.1 0.1 0.1 1.0
Operating temperature (°C) -20/+85 -20/+85 -20/+85 -20/+85
Storing temperature (°C) -35/+85 -35/+85 -35/+85 -35/+85

1Range D & E: 200 VDC 2Range D & E: 1.75 A 3Range D: 280 VDC; Range E: 310 VDC

Other switches by request.
Magnetic Sensitivity

Sensitivity class A B C D E
Pull-in AT range 5-10 10-15 15-20 20-25 25-30
Available switches 81 71 51/71/90

This data relates to unmodified Reed switches before mounting. Please refer to the respective single data sheets for sensitivity data and measurement methods for finished assemblies.

Order information

Ordering example

MK2/4 – 1A71 C – 500 W

MK2/4 Reed Sensor, 1 form A switch type 71, Sensitivity class C, Cable length 500mm, Termination W

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