MK7 Series

Magnetically operated Reed Sensor in cylindrical form with M8 thread-hole


MK7 sensors are magnetically operated Reed proximity switches in a cylindrical form with an M* x .75 thread and connecting cable or coupler. The sensor can be screwed directly into a work piece or mounted using a nut.  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. The magnetic pull-in / drop-out sensitivity is divided into five AT ranges.  A choice of switches, termination options and cable lengths is offered. The MK7 series is compatible with several inductive and magnetic proximity sensors due to the availability of the socket option.

ApplicationsPosition- and limit switch, e.g. pneumatic or hydraulic actuator position indication and end travel limit switch

Door and window contacts for security system applications

Level sensor, use with magnetic floats for water level detection in e.g. washing-machines, coffee makers, dish-washers

Position sensor, e.g. elevators, conveyors, sliding doors


Tolerance +/- 0.10mm (0.004 inch)

Dimension Drawing


The standard termination is a two- or three-wire UL-approved round cable with a cross section of 0.14mm². The standard length of the cable 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 (.2inch)
X Individual crimped terminals 
Y Individual spade terminals, 2.8 x 0.8mm(0.11 x 0.03inch)
T Tripolar connection socket 3-poles
U Encapsulated tripolar connector with thread M8

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

MK7 – 1A71 C – 500 W

MK7 Reed Sensor, 1 form A switch type 71, Sensitivity class C, cable length 500mm, Termination W

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