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MRX Series
DESCRIPTION
MRX Reed Relay Series are used for the
galvanic separation of intrinsically safe and non-
intrinsically safe circuits with an Ex-approval by
PTB-01 ATEX 2050 U. The MRX series is also
suitable for circuits of the category “ia” due to its
peak voltage of 375 Voltage.
FEATURES APPLICATIONS
Test and measurement
Process automatization in the min-
ing industry, chemical industry and
reneries.
•
•
Up to 4 form A switches or 1 form C switch
are available according to the different cast-
ings.
•
ORDER INFORMATION
Part Example No.
MRX05 - 1A71 05 is the nominal voltage
1A71 is the contact form
COIL DATA
Contact
form
Contact
type
Nominal
voltage
Coil resistance
± 10%
Pull-in
voltage
Drop-out
voltage
Nominal
power
All Data at 20oVDC ΩVDC VDC mW
1A/ 1C
21
71
79
90
5 360 3.8 1.0 70
6 360 4.5 1.0 100
12 1300 9.0 2.0 110
24 5880 18.0 3.5 98
2A 71
79
5 250 3.8 1.0 100
6 250 4.5 1.0 144
12 890 9.0 2.0 160
24 3500 18.0 3.5 165
4A 71
79
5 125 3.8 1.0 200
6 125 4.5 1.0 288
12 500 9.0 2.0 288
24 1780 18.0 3.5 324
Ex-approved-Reed Relays
177
MEDER electronic
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PIN OUT
(Top View)
DIMENSIONS
All Dimensions in mm [inch]
30 max.
10 max.
10 max.
5
20
2.5
3.2
[1.181]
[0.126]
[0.197]
[0.197]
[0.098]
[0.394]
[0.394]
± 0.2
[0.01]
30 max.
10 max.
10 max.
5
20
2.5
3.2
[1.181]
[0.126]
[0.197]
[0.197]
[0.098]
[0.394]
[0.394]
± 0.2
[0.01]
30 max.
10 max.
± 0.2
[0.01]
3.2
10
2.5
14.5 max.
20
[0.394]
[0.394]
[0.571]
[0.098]
[0.126]
[0.197]
[1.181]
30 max.
20
11 max.
3.2
2.5
27.5
22.5
[0.197]
[1.181]
[0.126]
[0.098]
[0.433]
[1.083]
[0.886]
± 0.2
[0.01]
1A / 1C 2 A 4 A
1A
2 A 4 A
1C
MRX Series
Ex-approved-Reed Relays
178
MEDER electronic
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All Data
at 20° C
Switch Model →
Contact form →
Switch 71
Form A / dry
Switch 79
Form A / dry
Contact Ratings Conditions Min. Typ. Max. Min. Typ. Max. Unit
Switching Power
Any DC combination of V & A not to
exceed their individual max‘s. 10 10 W
Switching Voltage DC or peak AC 200VDC 220VAC
Switching Current DC or peak AC 0.5 0.5 A
Carry Current DC or peak AC 1 1 A
Contact Resistance with 20 mV, 10 mA 150 150 mΩ
Isolation Resistance Across contacts
Contact to coil 1010 1011 Ω
Breakdown Voltage Across contacts
Contact to coil 300 400 VDC
Operate Time incl. Bounce With nominal voltage 0.5 0.8 ms
Release Time Without protective diode 0.2 0.4 ms
Capacitance Across open contacts
Contact to coil
0.3
2.0
0.4
2.0 pF
Life Expectance
Switching 5 Volts & 10mA DC only & <1010 pF stray cap. 1000 1000 106
Cycles
Environment Data
Shock Resistance 1/2 sinus wave duration 11ms 50 50 g
Vibration Resistance from 10 - 2000 Hz 20 20 g
Ambient Temperature max. 10°C/ minute allowable -20 85 -20 85 oC
Storage Temperature max. 10°C/ minute allowable -40 105 -40 105 oC
Soldering Temperature 5 Sec. dwell 260 260 oC
Washability Fully sealed
RELAY DATA
MRX Series
Ex-approved-Reed Relays
179
MEDER electronic
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All Data
at 20° C
Switch Model →
Contact form →
Switch 90
Form C / dry
Switch 21
Form C / dry
Contact Ratings Conditions Min. Typ. Max. Min. Typ. Max. Unit
Switching Power
Any DC combination of V & A not to
exceed their individual max‘s. 7 10 W
Switching Voltage DC or peak AC 28 100 VDC
Switching Current DC or peak AC 0.24 0.25 A
Carry Current DC or peak AC 0.5 0.5 A
Contact Resistance with 20 mV, 10 mA 150 150 mΩ
Isolation Resistance Across contacts
Contact to coil 1010 1011 Ω
Breakdown Voltage Across contacts
Contact to coil 300 400 VDC
Operate Time incl. Bounce With nominal voltage 2 2.5 ms
Release Time Without protective diode 2 2 ms
Capacitance Across open contacts
Contact to coil
1.0
2.0
0.8
2.0 pF
Life Expectance
Switching 5 Volts &
10 mA DC only & <1010 pF stray cap. 100 100 106
Cycles
Environment Data
Shock Resistance 1/2 sinus wave duration 11ms 50 50 g
Vibration Resistance from 10 - 2000 Hz 20 20 g
Ambient Temperature max. 10°C/ minute allowable -20 85 -20 85 oC
Storage Temperature max. 10°C/ minute allowable -40 105 -40 105 oC
Soldering Temperature 5 Sec. dwell 260 260 oC
Washability Fully sealed
RELAY DATA
MRX Series
Ex-approved-Reed Relays
