MS220K and MSR220K
10750-0702-00
Page
3 / 8
www.ziehl.de
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Application and Short description
ZIEHL PTC-resistor relays protect motors, transformers, machines and equipment against thermal overload.
With ZIEHL PTC Sensors MINIKA ® applied they offer best solutions for nominal response temperatures
60°C…180°C.
ZIEHL PTC-resistor relays are designed for PTC-sensors according to DIN 44081 and DIN 44082. Therefor
sensor and relays are exchangeable. PTC-resistor sensors are suitable for the installation into windings of
electrical machines, bearings and transformers as well as to monitor the temperature of liquid media, airflow
and gases.
Used in conjunction, they provide a effectively and reliable protection in case of
blocking rotors, heavy starts, countercurrent operation
undervoltage and phase failure
increased ambient temperature and hindered cooling
Approvals:
UL Recognized Component
without
electronic reclosing lock
MS220K
with
electronic reclosing lock
MSR220K
2
Wiring scheme
Us = supply voltage
S1 = pushbutton OFF
S2 = pushbutton ON
S3 = external reset
H1 = trip alarm
K1 = contactor
F1 - F4 = fuses
1) only versions with 2x CO
2) only MSR
