Editorial Technical Reference

Refrigerator Compressor Thermal Overload Protector

This page explains how Refrigerator Compressor Thermal Overload Protector is classified within Manufacture of Domestic Appliances. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

The Refrigerator Compressor Thermal Overload Protector is a safety-critical component used in hermetic compressor motors of domestic refrigeration appliances.

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Refrigerator Compressor Thermal Overload Protector in a manufacturing environment — Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Refrigerator Compressor Thermal Overload Protector

Definition

The Refrigerator Compressor Thermal Overload Protector is a safety-critical component used in hermetic compressor motors of domestic refrigeration appliances. It monitors the motor winding temperature and interrupts the electrical current when excessive heat is detected, preventing motor burnout and potential fire hazards. The device automatically resets once the temperature returns to safe levels, ensuring reliable compressor protection throughout the appliance's service life. This protector operates on the bimetallic disc principle: when heated by motor current or ambient temperature, the disc deforms, causing electrical contacts to separate and break the circuit; upon cooling, the disc returns to its original shape, re-establishing contact. Key parameters include a rated current of 0.5–2.5 A, trip temperature of 120–160 °C, reset temperature of 60–100 °C, maximum voltage of 250 V, contact resistance ≤50 mΩ, and a minimum of 100,000 operating cycles. The device is designed for an operating temperature range of -30 to 85 °C, humidity up to 95% RH (non-condensing), and ingress protection ratings of IP54 to IP65. The housing is made of flame-retardant PBT+GF30 (UL 94 V-0), and the device weighs 15–25 g. It meets dielectric strength of 1500 V AC for 1 minute and insulation resistance ≥100 MΩ at 500 V DC, per IEC 60730. This directory entry provides general specifications; always verify model-specific values and standards with the legal manufacturer or supplier before procurement or installation.

Working Principle

The protector uses a bimetallic disc that deforms when heated by motor current or ambient temperature. This deformation causes the electrical contacts to separate, breaking the circuit and stopping current flow. When the temperature cools to a safe level, the disc returns to its original shape, re-establishing contact and allowing the compressor to resume operation. This automatic reset ensures continuous protection without manual intervention.

Common Materials

Nickel-Iron Bimetal Alloy, Silver-Cadmium Oxide Contacts, Phenolic Housing

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated CurrentRequired	0.5–2.5 A	Maximum continuous operating current
Trip TemperatureRequired	120–160 °C	Temperature at which contacts open
Reset TemperatureRequired	60–100 °C	Temperature at which contacts re-close
Maximum VoltageRequired	250 V	Maximum operating voltage rating
Contact Resistance	≤50 mΩ	Electrical resistance of closed contacts
Operating Cycles	100000 cycles	Minimum guaranteed trip/reset cycles
Dielectric Strength	1500 V AC	Withstand voltage for 1 minuteIEC 60730
Insulation Resistance	≥100 MΩ	Measured at 500 V DCIEC 60730
Operating Temperature Range	-30–85 °C	Ambient temperature for reliable operation
Humidity Range	≤95 % RH	Non-condensing relative humidity
Ingress Protection	IP54–IP65	Dust and splash water protectionIEC 60529
Housing Material	PBT+GF30	Flame retardant V-0 gradeUL 94
Weight	15–25 g	Typical weight for standard models

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Bimetal Disc Part
Temperature sensing element that deforms with heat

Material: Nickel-Iron alloy
Contact Assembly
Electrical switching mechanism

Material: Silver-cadmium oxide
Terminal Pins Part
Electrical connection points

Material: Copper alloy
Protective Housing Part
Insulation and environmental protection

Material: Phenolic resin

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Refrigerator Compressor Thermal Overload Protector.

Manufacturers of Refrigerator Compressor Thermal Overload Protector

Manufacturer profiles associated with Refrigerator Compressor Thermal Overload Protector.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What is the function of a thermal overload protector in a refrigerator compressor?

It monitors the motor winding temperature and interrupts the electrical current if excessive heat is detected, preventing motor burnout and fire hazards. It resets automatically when the temperature returns to safe levels.

What are the typical trip and reset temperatures?

The trip temperature is typically 120–160 °C, and the reset temperature is 60–100 °C. These values are reference ranges; always confirm the exact settings for your specific model.

Which standards apply to this component?

Relevant standards include IEC 60730 for dielectric strength and insulation resistance, IEC 60529 for ingress protection, and UL 94 for flame retardancy. However, compliance must be verified with the manufacturer for the specific model.

How many operating cycles can the protector withstand?

The minimum guaranteed trip/reset cycles are 100,000. This ensures long-term reliability, but actual performance may vary depending on operating conditions.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 30 psig (typical compressor housing pressure)
other spec:	Current rating: 0.5-25A, Voltage: 120-600V AC, Response time: 2-30 seconds
temperature:	-40°C to 150°C (operating), 180°C max trip temperature