Switches for temperature

Limit value switch for temperature (NTC thermistor)


Limit value switch RH5

  • Limit value switch for temperature, NTC thermistor
  • Simple application; for harsh environments
  • Limit value freely adjustable by drum scale
  • Open-circuit or closed-circuit devices available
  • Compact and robust construction
  • Operating status indication by integrated LED


Limit value switches of type RH5 monitor electrical measured variables. The integrated relay switches when the actual value present reaches the set target value. Furthermore, limit value switches of this type are equipped with sensor monitoring for short circuits and wire breaks. Its compact and robust design, as well as the relevant shipbuilding approvals, make this product ideal for marine applications.

Technical data

Supply voltage US Us

18...32 VDC

Input signal


Output contact

Potential-free change over switch contact, closed circuit or open circuit

Maximum switching capacity

30 W (1 A at 30 VDC; 0.5 A at 60 VDC); 40 W (0.2 A at 220 VAC)

Operating temperature

-20 °C...+70 °C


DIN 46244 flat connector, gold-plated A6.3 x 0.8


G-channel TS32 or top-hat channel TS35

Ordering information

Type code structure




Example: RH51-A

Input range


Output signal

Type code RH5 …

Input range


40 … 120 °C = 2663.3 … 194.65 Ω (NORIS temperature sensors TH.1)



5 … 70 °C = 2181 … 231 Ω (NORIS temperature sensors TH.2)


Output contact



Output contact as changeover switch in normally closed



Output contact as changeover switch in normally open





Example: RH51-A