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Manufacture of Sensor and Magnetic Components

Series Datasheet – MK21 Reed Sensors www.standexmeder.com

MK21 Series
Reed Sensors

 Features: Screw Mount, Withstands Temp. >150°C (M-Version), Cable Termination & Lengths available
 Applications: Door & Window Contacts, With Magnetic Floats for Water Level Detection, Position Sensing
 Markets: Automotive, Appliance, Industrial, Security & Others

Part Description: MK 21/X-0X00X-000X

Contact Contact Switch Magnetic Cable Length

Version Termination
QTY Form Model Sensitivity (mm)
M = Molded 500, 1,000, 1,500,
1 A, B, C 66, 85, 90 B, C, D, E W
P = Potted 2,000, 3,000, 5,000

Customer Options Switch Model

Unit
Contact Data 66 85 90
Rated Power (max.) 10 100 10 W
Any DC combination of V&A not to exceed their individual max.’s
Switching Voltage (max.) 180 1,000 175 V
DC or peak AC
Switching Current (max.) 0.5 1 0.5 A
DC or peak AC
Carry Current (max.) 1.25 2,5 1.0 A
DC or peak AC
Contact Resistance (max.) 150 150 150 mOhm
@ 0.5V & 50mA
Breakdown Voltage (min.) 0.2 1,5 0.2 kVDC
According to EN60255-5
Operating Time (max.) 0.5 1.1 0.7 ms
Incl. Bounce; Measured with w/ Nominal Voltage
Release Time (max.) 0.05 0.1 1.5 ms
Measured with no Coil Excitation
Insulation Resistance (typ.) 1010 1010 109 Ohm
Rh<45%, 100V Test Voltage
Capacitance (typ.) 0.3 0.5 1.5 pF
@ 10kHz across open Switch

USA: +1.866.782.6339 │ salesusa@standexmeder.com Version 01

Europe: +49.7731.8399.0 │ info@standexmeder.com 27.01.2015
Asia: +86.21.37820625 │ salesasia@standexmeder.com

Modifications in the sense of technical progress are reserved.

 A Global Leader in the Design, Development, and
Manufacture of Sensor and Magnetic Components

Series Datasheet – MK21 Reed Sensors www.standexmeder.com

Housing and Cable Specifications MK20/1 Reed Sensor

Housing Material Epoxy Resin
Case Color Black
Sealing Compound -
Cable Typ Single Wires
Cable Material Radox
Cross Section (mm²) 0.34

Environmental Data Unit

Shock Resistance (max.) 50 g
1/2 sine wave duration 11ms
Vibration Resistance (max.) 20 g
Operating Temperature
Cable not moved
-40 to 150 °C
Operating Temperature Handling & Assembly Instructions
-30 to 150 °C
Cable moved
Storage Temperature -40 to 150 °C  Max torque on housing is 1Nm
 Cable bending-radius is diameter x 15
Glossary Contact Form  Min. bending distance to housing is 5mm
NO = Normally Open Contacts  Drag mark out of the mounting area forbidden
Form A
SPST = Single Pole Single Throw
 Decrease switching distance by mounting on iron
NC = Normally Closed Contacts
Form B  Do not use magnetically inductive screws
SPST = Single Pole Single Throw
Changeover  Series resistor recommended for > 5m cable length
Form C
SPDT = Single Pole Double Throw

Life Test Data

Glossary Magnetic Sensitivity *Load increase reduces life expectancy of Reed Switches
Sens. A B C D E F G
AT 05-10 10-15 15-20 20-25 25-30 30-35 35-40

USA: +1.866.782.6339 │ salesusa@standexmeder.com Version 01

Europe: +49.7731.8399.0 │ info@standexmeder.com 27.01.2015
Asia: +86.21.37820625 │ salesasia@standexmeder.com

Modifications in the sense of technical progress are reserved.

Mouser Electronics

Authorized Distributor

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MK21M-1C90B-500W MK21-1A66B-500W MK21-1A66C-500W MK21P-KIT