Capillary temperature switch LF55T

SPDTIP30refrigeration plant

Overview
LF55T temperature control switches are designed for temperature regulation and safety monitoring in industrial HVAC/R and process systems. Available with vapor charge (very small differential) or adsorption charge (commonly used for frost protection).

Key specifications
Model: LF55T
Contact configuration: SPDT
Electrical rating: AC15 10A/240V; DC12W/220V
Contact resistance: ≤ 500 mΩ
Contact materials: static = fine silver; movable = silver plated
Dielectric strength: 2000 V, 1 min no breakdown
Protection class: IP30 (IP44 with bracket and cover)
Operating ambient temperature: -25°C to 65°C
Media temperature: -40°C to 120°C
Capillary: Φ2.5; minimum contacting length 0.43 m; customizable length

Temperature ranges
-30 to 15°C | differential 2–10°C | example settings: -7 / -9°C
-5 to 30°C | differential 2–10°C | example settings: 10 / 7°C

Installation & wiring notes
Refer to product dimension drawings. Remove the temperature adjustment knob and fixing plate before adjusting the temperature and refit them after adjustment.
Low-temperature protection: connect wires 1–4. High-temperature protection: connect wires 1–2.

Technical specifications

• Model: LF55T
• Contact configuration: SPDT
• Electrical rating: AC15 10A/240V; DC12W/220V
• Contact resistance: ≤ 500 mΩ
• Contact materials: fine silver (static), silver plated (movable)
• Dielectric strength: 2000 V, 1 min no breakdown
• Protection class: IP30 (IP44 with bracket and cover)
• Operating ambient temperature: -25°C to 65°C
• Media temperature: -40°C to 120°C
• Mechanical life: 100,000 cycles
• Electrical life: 30,000 cycles
• Max installation torque: 2 N·m
• Capillary: Ø2.5 mm, minimum contacting length 0.43 m; customizable
• Cable connection: Ø6–14 mm