ETR203 Thermostat NO+NC

This dual adjustable temperature thermostat, ETR203, for any enclosure, houses two independent thermostats, which reduces space requirements within the enclosure. One has a normally open (NO) contact, and one has a normally closed (NC) contact, which means that one thermostat's temperature setting could control cooling and the other thermostat could control heating. The devices controlled, such as a filter fan or a fan heater, will then turn on or off at the required temperature level, set by the user, which results in reduced operational cost.

CE Declaration of Conformity EAC cRUus_UL Recognized
Feature: IP 20
ETR203 Product Image
Note Table 1
Weight (kg) 0.10
ETR203 Catalogue drawing image
Item no.: ETR203
EAN no.: 8713574088917
  • Technical data
  • Features
  • Downloads
  • CAD
  • Certificates

Technical data


Device with two independent thermostats, unlike thermostats with changeover contacts, connected devices can be switched in different temperature ranges. One thermostat with a normally closed contact for regulating heaters, and one with a normally opened contact for regulating cooling devices or signal devices. Sensor element thermostatic bimetal. Mounting clip for 35 mm DIN rail (EN 60715).


Plastic according to UL94 V-0.

Setting range:

0 °C to +60 °C. Switching temperature difference less than 7 °K, and switching point tolerance ±4 °K.

Switch capacity:

240 V AC, 10(2) A. 120 V AC, 15(2) A. 24 V DC, 30 W. Value in brackets for inductive load.

Operating temperature:

-40 °C to +80 °C.

Service life:

> 100,000 cycles.


Screw terminal for cable (0.5 to 2.5 mm²).


IP 20.


CE, EAC, cULus_UL Listed.


RAL 7035.

Pack quantity:

1 piece.



Dual adjustable thermostat, which houses two independent thermostats, one has a normally open (NO) contact, the other has a normally closed (NC) contact.


The dual thermostat can control two different devices where one requires a normally open (NO) contact and the other requires a normally closed (NC) contact. Therefore, one thermostat allows energy to flow to a device when the set temperature has been exceeded (NO) and the other thermostat prevents energy to flow to a device when the set temperature has been exceeded (NC). Customers are able to adjust both thermostat's temperature settings. The dual thermostat can control two devices at a time.


The installed devices, such as filter fans or fan heaters, automatically turn on or off when they are required, which reduces the operational cost of the control panel. As two independent thermostats are housed together, one thermostat's temperature setting will control cooling and the other thermostat's temperature setting will control heating. This thermostat will save space within the enclosure, when both cooling and heating devices have been installed, as only one device is required. Customers can adjust the required temperatures, which means it can be installed in any enclosure.

Image (JPG 800 x 470 px) ETR203 Catalogue drawing image 74 KB
Image (JPG 600 x 600 px) ETR203 Product Image 95 KB
Item sheet (PDF) ETR203 ENGLISH 151 KB
Mounting instructions document (PDF) Thermal Management ETR203 705 KB
Product sheet (PDF) ETR203(RUSSIAN) 119 KB



* Drawings generated according to ISO standard
CE Declaration of Conformity
Document (PDF) EAC 881 KB
Document (PDF) cRUus_UL Recognized 207 KB