MK21

Meder Electronic
MK21 Series
Reed Sensors with Mounting
Holes for Screw Fastening
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.
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
Other cables, connectors and colors available
Various case sizes available
Four operate sensitivities available
A choice of cable terminations and lengths are
available
DIMENSIONS
All dimensions in mm [inches]
www.willow.co.uk
Tel. +44 (0) 1342 835234
Fax. +44 (0) 1342 834306
MK21 Series
Meder Electronic
Reed Sensors with Mounting
Holes for Screw Fastening
ORDER INFORMATION
Part Number Example
SERIES
CONTACT
FORM
SWITCH
MODEL
MAGNETIC
SENSITIVITY
CABLE
LENGTH
(mm)
TERMINATION
MK21 -
1A
XX
X -
XXX
W
71
B, C, D, E
84
C, D, E
OPTIONS
500 *
MK21 - 1A71 C - 500
71 is the switch model
C is the magnetic sensitivity
500 is the cable length (mm)
* Other cable lengths available.
MAGNETIC SENSITIVITY
SENSITIVITY
CLASS
PULL IN
AT RANGE
B
10 - 15
C
15 - 20
D
20 - 25
E
25 - 30
TERMINATION
For wire and termination details please contact factory.
www.willow.co.uk
Tel. +44 (0) 1342 835234
W
Fax. +44 (0) 1342 834306
Meder Electronic
MK21 Series
Reed Sensors with Mounting
Holes for Screw Fastening
CONTACT DATA
Switch Model -->
Contact Form -->
All data at 20 0 C
Contact Ratings
Conditions
Contact 71
Form A
Min.
Typ.
Max.
Contact 84
Form A
Min.
Typ.
Max.
Units
Contact Rating
Any DC combination of V & A
not to exceed their individual
max.'s
10
10
W
Switching Voltage
DC or peak AC
200
400
V
Switching Current
DC or peak AC
0.5
0.5
A
Carry Current
DC or peak AC
1.25
1.0
A
Static Contact Resistance
w/ 0.5V & 10mA
150
150
mΩ
Dynamic Contact Resistance
Measured w/ 0.5V & 50mA
1.5 ms after closure
200
200
mΩ
Insulation Resistance across
Contacts
100 Volts applied
1010 *
1011
Ω
Breakdown Voltage across
Contacts
Voltage applied for 60 sec.
min.
225 *
700
VDC
Operate Time, incl. Bounce
Measured w/ 50% overdrive
0.5
2.0
ms
Release Time
Measured w/ no coil
suppression
0.1
0.1
ms
Capacitance
@ 10kHz across contact
0.2
0.7
pF
Contact Operation **
Must Operate Condition
Steady state field
10
30
15
30
AT
Must Release Condition
Steady state field
4
27
6
27
AT
Environmental Data
Shock Resistance
1/2 sine wave duration 11ms
50
50
g
Vibration Resistance
From 10 - 2000 Hz
20
20
g
Ambient Temperature
10 0 C/ minute max. allowable
Storage Temperature
Soldering Temperature
0
10 C/ minute max. allowable
-20
-35
5 sec. dwell
85
85
-20
-35
260
85
0
85
0
260
0
C
C
C
Please note: The indicated electrical data are maximum values and can vary downwards when using a more sensitive switch.
* Insulation resistance of 1012 and breakdown voltage of 480VDC 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.willow.co.uk
Tel. +44 (0) 1342 835234
Fax. +44 (0) 1342 834306