MS220K PTC-Resistor-Relay, AC 220-240 V, 1 change-over contact

MS220K PTC-Resistor-Relay, AC 220-240 V, 1 change-over contact
Price after registration.

Ready to ship today,
Delivery time appr. 1-3 workdays

  • T221745
cURus recognized more

PTC-resistor relay, single PTC-circuit


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

Functional overview

  • 1 PTC-resistor set with up to 6 PTC-sensors (250Ω), or bimetal contacts in series
  • output relay with 1 or 2 change-over contact (co)
  • operating status display with LED
  • K-Housing, vertical terminal order
  • width 22.7 mm
  • snap mounting on 35 mm standard DIN rail or screw mounting


Technical data

Rated supply voltage Us


AC 110 - 120 V, AC 220 - 240 V ± 10 % 50/60 Hz ≤ 2 VA
AC/DC 24 V, AC ± 10 % DC 21- 30 V < 2 VA,
without potential separation


Connectable PTC resistors


1...6 PTC according DIN VDE V 0898-1-401 (formerly DIN 44081/82) or bimetal contacts (Klixon)


Switching point


< 4000 Ω


Output relay


1 or 2 change-over-contact (co)


Type of contact


Type 2 (see general technical information)


Rated ambient temperature


-20...+55 °C


Dimensions h x w x d


Design K: 75 x 22.5 x 115 [mm]




on 35 mm DIN rail according to EN 60 715 or screws M4 (option)


Protection Housing/Terminals






approx. 150 g

Input / measuered parameter: Measuring input PTC
Outputs: Alarms/relays
Design: Mount in switchgear cabinet
Approvals: UL/CSA
Extras: 1 sensor input
Applications: Protection of motors, Protection of pumps, Heat and power plants