MS220Vi and MSR220Vi
11910-0701-01
Page
3 / 12
www.ziehl.de
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Display and control elements
MS220Vi
MSR220Vi
without electronic reclosing lock
with electronic reclosing lock (disconnectible)
Alarm (red) ON (green)
Alarm (red) ON (green)
build in key „reset“ (blue)
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Pre-Adjustment
No settings are necessary on the devices. The tripping temperature is determined solely by the response
temperature of the connected PTC thermistors.
Depending on the number of PTC thermistors the following tripping temperatures and reset temperatures
arise related to TNF (detector operating temperature):
Tripping temperature
Reset temperature
1 PTC thermistor
TNF + 15 K
TNF + 5 K
3 PTC thermistors in series
TNF + 5 K
TNF
– 5 K
6 PTC thermistors in series
TNF
TNF
– 20 K
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Application and brief description
Ziehl PTC thermistor relays protect motors, transformers, machines and equipment against thermal overload.
Used in conjunction with respective PTC thermistors they provide a reliable temperature protection in the
temperature range 60 °C up to 180 °C.
ZIEHL PTC thermistor relays are conform to EN 60947-8. PTC-thermistors according DIN 44081 and DIN
44082 shall be connected. PTC thermistors are suitable for the installation into windings of electrical
machines, bearings and transformers as well as to monitor the temperature of coolant, airflow and gases.
II (1) G [Ex ia Ga] IIC
II (1) D [Ex ia Da] IIIC
TMP tripping devices MS 220 Vi und MSR 220 Vi are build as associated electrical equipment with type of
protection intrinsic safety "i". All functions in the TMP tripping device serve to protect non-explosive-protected
equipment and explosive-protected equipment in regular operation and in case of failure. The devices monitor
electrical apparatus for explosive gas atmospheres (Zone 0, 1 und 2) and electrical apparatus for use in the
presence of combustible dust (Zone 20, 21 and 22). Installation only in safe area.
To limit the maximum surface temperatures, TMP tripping relay must be installed according to the requirements
and documentation. The power supply must be switched off either directly or indirectly. Reset should admissible
by hand only.
