MK20 Series

Cylindrical Reed Sensors


MK20 sensors are magnetically operated Reed proximity switches in a cylindrical module, fitted with interconnect cable. The sensor should be mounted on a fixed surface with the actuating magnet, e.g. M3, on the moving surface. Introduction and removal of the magnetic field determines the closing and opening of the Reed Switch. The magnetic pull-in / drop-out sensitivity is divided into three AT ranges. A choice of switches, termination options and cable lengths is offered.


Position and limit switch, Pneumatic or hydraulic actuator position indication and end travel limit switch

Security system applications, door and window contacts

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


Tolerance +/- 0.10mm (0.004 inch) (Flat side indicates maximum sensitivity)


The standard termination is a two-wire flat cable with a cross section of 2 x 0.14mm². The standard cable length is 500mm, other lengths can be supplied on request. The required length has to be stated on 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 (0.2inch)
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 form A/dry
Rated Power max. (W) 5
Switching voltage max. (VDC) 175
Switching current max. (A) 0.25
Carry current (A) 0.5
Contact resistance max. mOhm 400
Breakdown voltage (contact/contact) min. (VDC) 200
Operating time incl. bounce (ms) 0.4
Releasing time (ms) 0.1
Operating temperature (°C) -20/+70
Storing temperature (°C) -20/+70

Other switches by request.
Magnetic Sensitivity

Sensitivity class B C D
Pull-in AT range 10-15 15-20 20-25

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

MK20 – C – 300 W

MK20 Reed Sensor, Sensitivity class C, Cable length 300mm, Termination W

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