MK21 Series
Reed Sensors with Mounting
Holes for Screw Fastening
MEDER electronic
DESCRIPTION
MK21 sensors are magnetically operated Reed
proximity switches designed for screw mounting.
The sensor should be mounted on a fixed surface
with the actuating magnet on the moving surface.
Introduction or removal of the magnetic field
determines the closing and opening of the Reed
Switch. Leads are Teflon coated. Designed for
extreme environment. Resistant to water, fuels,
oils, inks and most acids.
APPLICATIONS
•
Position and limit switch
Pneumatic or hydraulic actuator position
•
End motion detection for linear drive
Indication and end travel limit switch
•
Machine industry
End motion detection and door/flap control
FEATURES
•
High power switches available
•
Designed for high temperature up to 160
o
C
(molded version)
•
Four operate sensitivities available
•
A choice of cable terminations and lengths are
available
•
Molded and potted versions available
All dimensions in mm [inch]
DIMENSIONS
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270
MEDER electronic
MK21 Series
Reed Sensors with Mounting
Holes for Screw Fastening
ORDER INFORMATION
Part Number Example
MK21M - 1A66 C - 500
MK21P - 1A66 C - 500
M = molded
P = potted
66
is the switch model
C
is the magnetic sensitivity
500
is the cable length (mm)
Options
1 Form B“*
1 Form C**
W
W
Series
MK21x-
Contact-
form
xx
1 Form A
Switch
Model
xx
66
52, 85
90
Magnetic
Sensitivity
x-
B, C, D, E
C, D, E
C, D, E
Cable
Length
(mm)
xxx
Termination
W
500*
* Other cable lengths available
** Potted version
MAGNETIC SENSITIVITY
Sensitivity
Class
Pull In
AT Range
B
C
D
E
10 - 15
15 - 20
20 - 25
25 - 30
For wire and termination details, as well as other magnetic sensitivity classes please contact factory.
TERMINATION
W
The cable cut length includes:
5 mm of wire stripped and tinned.
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271
MK21 Series
Reed Sensors with Mounting
Holes for Screw Fastening
MEDER electronic
CONTACT DATA
All Data at 20° C
Contact Ratings
Switching Power
Switching Voltage
Switching Current
Carry Current
Static Contact Resistance
Dynamic Contact Resistance
Switch Model
→
Contact Form
→
Conditions
Any DC combination of V & A not to
exceed their individual max.‘s
DC or peak AC
DC or peak AC
DC or peak AC
w/ 0.5 V & 10 mA
Measured w/ 0.5 V & 50 mA ,
1.5 ms after closure
Switch 52
Form A
Min. Typ.
Max.
50
70 (VA)
250
0.5
2.5
200
Switch 66
Form A
Min. Typ. Max. Unit
10
200
0.5
1.25
150
200
W
V
A
A
mΩ
mΩ
Ω
VDC
0.5
0.1
0.2
ms
ms
pF
Insulation Resistance across
100 volts applied
Contact
Breakdown Voltage across
Contact
Operate Time incl. Bounce
Release Time
Capacitance
Contact Operation **
Must Operate Condition
Must Release Condition
Environmental Data
Shock Resistance
Vibration Resistance
Ambient Temperature
Ambient Temperature
Stock Temperature
Soldering Temperature
1/2 sinus wave duration 11 ms
From 10 - 2000 Hz
M 10°C/ minute max. allowable
P 10°C/ minute max. allowable
10°C/ minute max. allowable
5 sec.
Steady state field
Steady state field
Voltage applied for 60 sec. min.
Measured w/ 100 % overdrive
Measured w/ no coil suppression
at 10 kHz cross contact
10
10
600
10
10
*
225*
1.0
0.1
0.2
10
4
30
27
10
4
60
54
AT
AT
50
20
-20
-35
85
85
260
260
-30
-20
-40
50
20
150
85
160
260
g
g
o
C
C
C
C
o
o
o
Please note: The indicated electrical data are maximum values and can vary downwards when using a more sensitive
switch.
* Insulation resistance of 10
12
and breakdown voltage of 480 VDC is available.
** These ranges refer to the uncut / unmodified Reed Switches described in our Reed Switch section. Consult factory if
more detail is required.
www.meder.com
272
MEDER electronic
MK21 Series
Reed Sensors with Mounting
Holes for Screw Fastening
CONTACT DATA
All Data at 20° C
Contact Ratings
Switching Power
Switching Voltage
Switching Current
Carry Current
Static Contact Resistance
Dynamic Contact Resistance
Switch Model
→
Contact Form
→
Conditions
Any DC combination of V & A
not to exceed their individual
max.‘s
DC or peak AC
DC or peak AC
DC or peak AC
w/ 0.5 V & 10 mA
Measured w/ 0.5 V & 50 mA ,
1.5 ms after closure
Switch 85
Form A
Switch 90
Form B/C, potted
Min. Typ. Max. Min. Typ. Max. Unit
100
400
1.0
2.5
150
200
10
10
4000
20
175
0.5
1.0
150
250
10
9
200
W
V
A
A
mΩ
mΩ
Ω
VDC
Insulation Resistance across
100 volts applied
Contact
Breakdown Voltage across
Contact
Operate Time incl. Bounce
Release Time
Capacitance
Contact Operation **
Must Operate Condition
Must Release Condition
Environmental Data
Shock Resistance
Vibration Resistance
Ambient Temperature
Ambient Temperature
Stock Temperature
Soldering Temperature
1/2 sinus wave duration 11 ms
From 10 - 2000 Hz
M 10°C/ minute max. allowable
P 10°C/ minute max. allowable
10°C/ minute max. allowable
5 sec.
Steady state field
Steady state field
Voltage applied for 60 sec.
min.
Measured w/ 100 % overdrive
Measured w/ no coil
suppression
at 10 kHz cross contact
1.0
0.1
0.2
1.0
0.7
1.5
ms
ms
pF
20
12
60
54
15
40
AT
AT
50
20
-20
-35
85
85
260
260
-20
-35
50
20
85
85
260
260
g
g
o
C
C
C
C
o
o
o
Please note: The indicated electrical data are maximum values and can vary downwards when using a more
sensitive switch.
* Insulation resistance of 10
12
and breakdown voltage of 480 VDC is available.
** These ranges refer to the uncut / unmodified Reed Switches described in our Reed Switch section. Consult
factory if more detail is required.
www.meder.com
273
Mouser Electronics
Authorized Distributor
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MK21M-1A66B-500W MK21-1A66B-500W MK21-1A66C-500W
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