Type YF43NC & YF45NC: Probe sensor adjustable manual reset electronic limiters




– Equipment requesting a very strong resistance to water ingress. The transparent cover allows to visualize the set point and the 2 pilot lights.

These electronic rod thermostats are installed inside pockets as immersion thermostats in pipelines and containers, and for monitoring temperature in air ducts.

– Manual reset allows the use as high temperature alarm 


Housing: Protection class IP 66 upon EN 60529 (waterproof spray water under high pressure and sea splashes, totally dust tight). Body in black PA66, fiber glass reinforced. The transparent polycarbonate cover can be unscrewed by hand, but it is also possible to use a hook spanner.

Set point adjustment:  By °C printed knob. All types have an adjustable rotation limit system located inside the knob that allows reducing the set point adjustment span. °F printed knobs available as an option

Operation:  Microprocessor electronic thermostat.

Set point adjustment ranges: -4-40°C (40-105°F); 30-90°C (85-195°F); 30-110°C (85-230°F).

Manual reset button: located beside the knob 

Sensing element: Dia. 5mm NTC sensor (10KOhms @25°C),   inside nickel plated brass pocket.  Thread ½” BSPT. Tube outside diameter 8mm.  Maximum temperature on the probe: 120°C (250°F).   Located at the bottom of the housing, 2 screws are used to secure standard pockets. (See the compatible brass pockets range in the accessories section).

Pilot lights: One pilot light visualizes the thermostat contact output position. The other visualizes the power supply input. Phase and line 230V power supply is mandatory for these pilot lights.

Cable input and output: Two M20 cable glands, built-in black PA66.

Electrical connections:  Inside, on screw terminal connection block. It is possible to connect 2 wires 1.5mm² on each terminal.

Earthing:  Internal screw terminal.

Mounting: By the pocket thread or by 2 legs with holes for screws dia. 4 to 5 mm, 114 mm distance.

Identification: Identification label on backside

Contact: SPST. 16A (2.6), 250VAC. Open or close on temperature rise.

Model with contact closing on temperature rise is used to switch on an alarm. Version with contact opening on temperature rise is used to switch off heating.

Electrical life: >100.000 cycles. 

Minimum storage temperature: -35°C (-30°F)

Maximum ambient temperature: 60°C (140°F)

For more technical information see 2PE2N6 thermostat technical data sheet



2D&3D Drawing

Main references

Temperature adjustment ranges

°C (°F)

References with SPNC contact, open on temperature rise References with SPNO contact, close on temperature rise Pocket length

(L, mm)

Temperature sensing length


4-40°C (40-105°F) YF43NC04040118UJ YF44NC04040118UJ 110 50
4-40°C (40-105°F) YF43NC04040178UJ YF44 NC04040178UJ 170 50
4-40°C (40-105°F) YF43NC04040238UJ YF44 NC04040238UJ 230 50
4-40°C (40-105°F) YF43NC04040308UJ YF44 NC04040308UJ 300 50
4-40°C (40-105°F) YF43NC04040458UJ YF44 NC04040458UJ 450 50
4-40°C (40-105°F) YF43NC04040608UJ YF44 NC04040608UJ 600 50
30-90°C (85-195°F) YF43NC30090118UJ YF44 NC30090118UJ 110 50
30-90°C (85-195°F) YF43NC30090178UJ YF44 NC30090178UJ 170 50
30-90°C (85-195°F) YF43NC30090238UJ YF44 NC30090238UJ 230 50
30-90°C (85-195°F) YF43NC30090308UJ YF44 NC30090308UJ 300 50
30-90°C (85-195°F) YF43NC30090458UJ YF44 NC30090458UJ 450 50
30-90°C (85-195°F) YF43NC30090608UJ YF44 NC30090608UJ 600 50
30-110°C (85-230°F) YF43NC30110118UJ YF44 NC30110118UJ 110 50
30-110°C (85-230°F) YF43NC30110178UJ YF44 NC30110178UJ 170 50
30-110°C (85-230°F) YF43NC30110238UJ YF44 NC30110238UJ 230 50
30-110°C (85-230°F) YF43NC30110308UJ YF44 NC30110308UJ 300 50
30-110°C (85-230°F) YF43NC30110458UJ YF44 NC30110458UJ 450 50
30-110°C (85-230°F) YF43NC30110608UJ YF44 NC30110608UJ 600 50

°F printing: replace last character (J) by K