MS220VA and MSR220VA
11660-0701-03-GB
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3 / 12
www.ziehl.de
1
General Notes
Compliance with the following instructions is mandatory to ensure the functionality and safety of the product.
If the following instructions given especially but not limited for general safety, transport, storage, mounting,
operating conditions, start-up, maintenance, repair, cleaning and disposal / recycling are not observed, the
product may not operate safely and may cause a hazard to the life and limb of users and third parties.
Deviations from the following requirements may therefore lead both to the loss of the statutory material defect
liability rights and to the liability of the buyer for the product that has become unsafe due to the deviation from
the specifications.
2
Display- and control elements
1 = LED red „ALARM“
2 = LED green „Power ON“
3 = built-
in key button “Reset”
3
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
4
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.
