MK4

Meder Electronic
MK4 Series
Reed Sensors
for Screw Fastening
DESCRIPTION
MK4 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.
APPLICATIONS
• Position and limit switch
Pneumatic or hydraulic actuator position
indication and end travel limit switch
• Door and window contacts
Security system applications
• Level sensor
Use with magnetic floats for water level
detection in coffee makers, washing
machines or dishwashers
FEATURES
• Form A, B, and C available
• High power switches available
• Other cables, connectors and colors available
• Various case sizes available
• Five operate sensitivities available
• A choice of switch terminations and cable
lengths are available
DIMENSIONS
All dimensions in mm [inches]
www.willow.co.uk
Tel. +44 (0) 1342 835234
Fax. +44 (0) 1342 834306
MK4 Series
Meder Electronic
Reed Sensors
for Screw Fastening
ORDER INFORMATION
SERIES
CONTACT
FORM
SWITCH
MODEL
MAGNETIC
SENSITIVITY
CABLE
LENGTH
(mm)
TERMINATION
MK4 -
XX
XX
X -
XXX
X
71
B, C, D, E
81
A
1 Form A
OPTIONS
500 *
MK4 - 1A71 C - 500
W, X, Y
84
1 Form B
1 Form C
Part Number Example
1A is the contact form
71 is the switch model
C is the magnetic sensitivity
500 is the cable length (mm)
W is the termination
C, D, E
90
* Other cable lengths available.
MAGNETIC SENSITIVITY
SENSITIVITY
CLASS
PULL IN
AT RANGE
A
5 - 10
B
10 - 15
C
15 - 20
D
20 - 25
E
25 - 30
TERMINATION
For wire and termination details please consult factory.
Form C version requires 3 conductors.
www.willow.co.uk
Tel. +44 (0) 1342 835234
W
Fax. +44 (0) 1342 834306
Meder Electronic
MK4 Series
Reed Sensors
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 81
Form A
Min.
Typ.
Max.
Units
Contact Rating
Any DC combination of V & A
not to exceed their individual
max.'s
10
5
W
Switching Voltage
DC or peak AC
200
90
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
200
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 *
109
Ω
Breakdown Voltage across
Contacts
Voltage applied for 60 sec.
min.
225 *
100
VDC
Operate Time, incl. Bounce
Measured w/ 100% overdrive
0.5
0.5
ms
Release Time
Measured w/ no coil
suppression
0.1
0.1
ms
Capacitance
@ 10kHz across contact
0.2
0.2
pF
Contact Operation **
Must Operate Condition
Steady state field
10
30
5
10
AT
Must Release Condition
Steady state field
4
27
2
9
AT
Environmental Data
Shock Resistance
1/2 sine wave duration 11ms
50
30
g
Vibration Resistance
From 10 - 2000 Hz
20
10
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
C
85
0
C
260
0
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 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.wilow.co.uk
Tel. +44 (0) 1342 835234
Fax. +44 (0) 1342 834306
MK4 Series
Meder Electronic
Reed Sensors
for Screw Fastening
CONTACT DATA
Switch Model -->
Contact Form -->
All data at 20 0 C
Contact Ratings
Conditions
Contact 84
Form A
Min.
Typ.
Max.
Contact 90
Form B / C
Min.
Typ.
Max.
Units
Contact Rating
Any DC combination of V & A
not to exceed their individual
max.'s
10
3
W
Switching Voltage
DC or peak AC
400
175
V
Switching Current
DC or peak AC
0.5
0.25
A
Carry Current
DC or peak AC
1.0
1.2
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
250
mΩ
Insulation Resistance across
Contacts
100 Volts applied
1011
109
Ω
Breakdown Voltage across
Contacts
Voltage applied for 60 sec.
min.
700
200
VDC
Operate Time, incl. Bounce
Measured w/ 100% overdrive
2.0
0.7
ms
Reset Time
Measured w/ no coil
suppression
0.1
1.5
ms
Capacitance
@ 10kHz across contact
0.7
1.0
pF
Contact Operation **
Must Operate Condition
Steady state field
15
30
10
35
AT
Must Reset Condition
Steady state field
6
27
4
30
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
0
Storage Temperature
10 C/ minute max. allowable
Soldering Temperature
-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.
** 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