Switches for temperature

Limit value switch for temperature (NTC thermistor)


Limit value switch RH5
  • Limit value switch for temperature, NTC thermistor
  • Simple application; for rough 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 Us18 ... 32 VDC
Input signalTemperature thermistor
Output contact'Potential-free change over switch contact, closed circuit or open
Maximum switching capacity30 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
ConnectionDIN 46244 fl at connector, gold-plated A6.3 x 0.8
MountingSnap-fit on G-channel TS32 or top-hat channel TS35

Ordering information

Type code structure
RH51-AExample: RH51-A
Input range
 Output signal
Type code RH5 …
Input range 140 … 120 °C = 2663.3 … 194.65 Ω (NORIS temperature sensors TH.1) 
25 … 70 °C = 2181 … 231 Ω (NORIS temperature sensors TH.2) 
Output contact  Output contact as changeover switch in normally closed 
AOutput contact as changeover switch in normally open 
RH5__-__Example: RH51-A