Dual-Zone Controlled 25t65 Pressure-Type Refrigerator Thermostat for Small Display Case

Product Description

Product Description

Dual-zone Controlled 25T65 Pressure-type Refrigerator Thermostat for Small Display Case

This is a 25T65 type pressure-type refrigerator thermostat (also known as the 077B series), a core temperature control component for refrigerators, freezers, and other refrigeration equipment.

Working Principle:

It operates based on the principle of liquid thermal expansion and contraction and pressure-driven contact switching:
-- Temperature Sensing: A temperature-sensing bulb (probe) is installed near the refrigerator evaporator and is filled with a temperature-sensing liquid (such as isobutane).

-- Pressure Conversion: When the internal temperature of the refrigerator rises, the liquid in the temperature-sensing bulb evaporates, increasing the pressure; when the temperature drops, the gas condenses into liquid, decreasing the pressure.

-- Switching Action: This pressure change is transmitted through a capillary tube to the bellows inside the thermostat, driving the mechanical structure to control the opening and closing of the main contacts, thereby starting and stopping the compressor and maintaining a constant internal temperature in the refrigerator.

-- Manual Adjustment: The adjustment shaft on the top can change the spring preload, thus setting different temperature control levels.

Specification

Product Name	(25T65) Pressure-type Refrigerator Thermostat
Electrical Parameters:	Rated Voltage	250V~ 50/60Hz
	Main Contact Current	6 (6) A (resistive load)
	Auxiliary Contact Current	0.5 (0.1) A / 0.1A (signal or indicator light circuit)
	Electrical Life	≥ 10,000 cycles
	Insulation Resistance	≥ 100 MΩ (at 500V DC)
	Withstand Voltage	2000V AC (1 minute)
Temperature Control Parameters	Temperature Control Range	-37°C ~ -16°C (for freezers) / -25°C ~ +10°C (for dual-zone refrigerators)
	Temperature Switching Difference	3~5°C (fine-tunable via the adjusting shaft)
	Temperature Control Accuracy	±1°C
	Ambient Temperature Range	0°C ~ 60°C
Physical & Mechanical Parameters	Capillary Length	Commonly 1000mm, 1300mm, 1500mm.
	Sensing Bulb Material	Stainless steel (resistant to refrigerant corrosion)
	Capillary Material	Tin-plated copper (good thermal conductivity)
	Main Body Material	Galvanized steel plate + engineering plastic
	Installation Method	Clip-on or screw-fixed
	Adjustment Shaft Type	Standard flat shaft (compatible with knobs)
	Dimensions	Approx. 60mm × 30mm × 25mm
Certifications & Standards	Safety Certification	Complies with EN 60730-2-9 EU safety standard
	Explosion-proof Certification	Complies with IEC 60079-0 (applicable to flammable refrigerants such as R600a)
	Environmental Certification	RoHS compliant, free of lead, mercury, and other hazardous substances.

Product Features & Main Application Scenarios: 

Features:

1) Purely Mechanical Structure: No power supply required, operates based on physical principles, high reliability, and resistant to electromagnetic interference.

2) Dual Temperature Zone Control: Supports independent temperature control for the freezer and refrigerator compartments.

3) Safety Protection: Built-in overload protection and explosion-proof design, meeting EU safety standards.

4) Flexible Installation: The capillary tube can be freely bent to adapt to different refrigerator internal layouts.

5) Precise Temperature Control: Temperature control accuracy up to ±1°C, ensuring food preservation.

Application :

1) Household Refrigerators/Freezers: Single-door, double-door, and triple-door refrigerators, as well as upright/horizontal freezers.

2) Commercial Refrigeration Equipment: Small display cases, beverage cabinets, ice makers, etc.

3) Specialized Refrigeration Equipment: Laboratory low-temperature storage boxes, medical refrigeration equipment, etc.

Product Pictures

Packing & Delivery

Workshop Pictures

Certifications

FAQ

FAQ

Q1 Are you trader? 
A1 We are factory.
 
Q2 What's your lead time for 5000pcs?
A2 We need around 20days after down payment received. .
 
Q3 You payment term?
A3 We accept LC, T/T 20% remittance +80% before delivery, DP.
 
Q4 Can we print our LOGO on heating element?
A4 Yes.
 
Q5 Do you offer guarantee? 
A5 Yes. We offer 1 year guarantee.