Type YF4LNC: Fixed setting manual reset limiter, rod



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

These liquid expansion rod manual reset limiter can be installed inside pockets as immersion thermostats in pipelines and containers, and as high limit safety in air ducts, in usual industrial applications and environments. (Not suitable for hazardous areas).

– Sealed temperature set point


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. . Mechanical impact resistance : IK10. High UV resistance.

Action:  Fail safe manual reset high temperature limit.

Set point calibration value:  80±8°C (176±15°F), 90±8°C (194±15°F), 110±8°C (230±15°F). Other calibration temperature on request, between 30°C and 320°C (85°F and 230°F).

Temperature adjustment:  Fixed setting, sealed, no access to user.

Sensing element: Liquid expansion bulb and capillary inside nickel plated brass pocket.  Thread ½” BSPT. Tube outside diameter 6mm.  Located at the bottom of the housing, 2 screws are used to secure standard  pockets. (See the compatible stainless steel and 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 electrical 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.  Set point calibration is printed in °C and °F beside the manual reset button.

Contact: Single pole, open on rise (SPNC)

Electrical rating:  16A res. 250/400VAC

-Electrical life >6.000 cycles.

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

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

For more technical information see 8L  limiter technical data sheet (catalog 1).


2D&3D Drawing


校准温度°C (°F) 编号 最小的可重设温度°C (°F) 探温棒长度(mm) 温度感应长度(mm) 棒上的最高温度°C (°F)
80±8°C (176±15°F) YF4LNC25080823UD 52°C (126°F) 230 87 105°C (221°F)
80±8°C (176±15°F) YF4LNC25080830UD 52°C (126°F) 300 87 105°C (221°F)
80±8°C (176±15°F) YF4LNC25080845UD 52°C (126°F) 450 87 105°C (221°F)
80±8°C (176±15°F) YF4LNC25080860UD 52°C (126°F) 600 87 105°C (221°F)
90±8°C (194±15°F) YF4LNC25090823UD 60°C (140°F) 230 87 115°C (239°F)
90±8°C (194±15°F) YF4LNC25090830UD 60°C (140°F) 300 87 115°C (239°F)
90±8°C (194±15°F) YF4LNC25090845UD 60°C (140°F) 450 87 115°C (239°F)
90±8°C (194±15°F) YF4LNC25090860UD 60°C (140°F) 600 87 115°C (239°F)
110±8°C (230±15°F) YF4LNC25110823UD 75°C (167°F) 230 87 135°C (275°F)
110±8°C (230±15°F) YF4LNC25110830UD 75°C (167°F) 300 87 135°C (275°F)
110±8°C (230±15°F) YF4LNC25110845UD 75°C (167°F) 450 87 135°C (275°F)
110±8°C (230±15°F) YF4LNC25110860UD 75°C (167°F) 600 87 135°C (275°F)