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Monitoring Technique
VARIMETER EX
Thermistor Motor Protection Relay
MK 9003 ATEX
MK 9003.12/11120
Circuit Diagrams
A1
11
21
P1
P2
A1
P1
11
21
A2 P2
12
14
22
24
22 24
M7191
12
14 A2
MK 9003.12/0_ _ _ _
Connection Terminals
Terminal designation
A1, A2
P1, P2
X1, X2
11, 12, 14
21, 22, 24
All technical data in this list relate to the state at the moment of edition. We reserve the right for
technical improvements and changes at any time.
A1
11
21
P1
P2
X1
A1
P1 X1
11
21
A2 P2 X2
12
14
22
24
22
24
X2
M7649_b
12
14
A2
MK 9003.12/1_ _ _ _
Signal designation
Auxiliary voltage
Thermistor input
Remote reset
Changeover contacts
Your advantages
• Reliable temperature monitoring of motors
• Rapid fault location
Features
• According to EN 60947-5-1, EN 60947-8, EN 60079-14, EN 61508,
EN 50495, EN 13849
• Detection of
- overtemperature
- broken wire in sensor circuit
- short circuit in sensor circuit
• 1 input for 3 or 6 PTC-reistors
• Functions as options or settable with DIP-switches:
- automatic reset (fault is not stored)
- manual reset (fault is stored)
- manual reset only on start-up
- manual reset on and also after start-up
• No voltage safe manual reset
• Closed circuit operation
• LED indicators for
- auxiliary supply
- contact position
- overtemperature, broken wire or short-circuit in sensor circuit
• 2 changeover contacts
• Button for reset function
• Remote reset via terminals X1 / X2 (NO contact)
• Optionally safe separation according to EN 61 140, EN 60 947-1, 6 kV/2
between:
- auxiliary voltage and measuring circuit
- auxiliary voltage and output contacts
- measuring circuit and output contacts
- the 2 changeover contacts (only with 2 changeover contacts)
• Width 22.5 mm
Approvals and Markings
1)
Directive
2014/34/EU
1)
EG type test no
. PTB 02 ATEX 3057
II (2) G [Ex e] [Ex d] [Ex px] [Ex n]
Marking
II (2) D [Ex tb] [Ex tc]
Applications
Temperature monitoring of explosion protected Motors by „extended safety"
Ex e EN 60079-7, „pressure proof enclosure" Ex d EN 60079-1 or
„overpressure enclosure" Ex px in gas containing atmosphere as well as
„protection by enclosures" Ex tb resp. Ex tc EN 60079-31 in dust containing
atmosphere. The thermistor Motor protection relay protects Standard and
Explosion proof Motor against overheating due to overload accoding to
EN 60079-14 and EN 60079-0.
Indicators
green LED:
red LED:
yellow LED:
sensor circuit
13
on, when supply voltage connected
on, when output contact de-energized
on, when overtemperature of failure in
MK 9003-ATEX / 30.09.21 en / 452A
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