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INDUSTRY COMPONENT

Bimetal Disc

A temperature-sensitive bimetal disc used in refrigerator compressor thermal overload protectors to prevent motor damage by breaking electrical circuits at specific temperatures.

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Component Specifications

Definition

A precision-engineered thermal protection component consisting of two bonded metal strips with different coefficients of thermal expansion. When exposed to temperature changes, the differential expansion causes the disc to snap between convex and concave positions, mechanically opening or closing electrical contacts in compressor protection circuits.

Working Principle

Operates on the differential thermal expansion principle where two dissimilar metals expand at different rates when heated. This causes controlled mechanical deformation (snap-action) at predetermined temperature thresholds, either opening the circuit during overheating or closing it after cooling to safe temperatures.

Materials

Typically composed of manganese-nickel-copper alloy (active layer) bonded to nickel-iron alloy (passive layer) with specific thickness ratios (commonly 0.1-0.3mm each). May include silver-cadmium oxide contacts for electrical switching.

Technical Parameters

Response Time <10 seconds at trip temperature
Mechanical Life >10,000 cycles
Trip Temperature Typically 100-130°C (adjustable)
Electrical Rating 10-25A, 250V AC
Reset Temperature Typically 70-90°C below trip point
Operating Temperature Range -40°C to 150°C

Standards

ISO 1328, DIN 1544, IEC 60947-4-1

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bimetal Disc.

Parent Products

This component is used in the following industrial products

Refrigerator Compressor Thermal Overload Protector

Thermal protection device for refrigerator compressor motors

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Engineering Analysis

Risks & Mitigation

Premature tripping causing compressor shutdown
Failure to trip leading to motor burnout
Contact welding creating permanent short circuit
Calibration drift over time
Mechanical fatigue from vibration

FMEA Triads

Trigger: Material fatigue from thermal cycling
Failure: Loss of snap-action response
Mitigation: Use fatigue-resistant alloys and optimize thickness ratios

Trigger: Electrical arcing during contact separation
Failure: Contact welding and permanent circuit closure
Mitigation: Implement arc suppression circuits and use arc-resistant contact materials

Trigger: Vibration in compressor environment
Failure: Mechanical damage or calibration shift
Mitigation: Add vibration damping mounts and reinforce disc mounting

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Trip temperature tolerance ±3°C, reset temperature tolerance ±5°C

Test Method

ISO 1328 thermal cycling test, IEC 60947 electrical endurance test, vibration testing per MIL-STD-810

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What causes a bimetal disc to fail in refrigerator compressors?

Common failures include material fatigue from repeated cycling, contact welding due to electrical arcing, calibration drift from prolonged high-temperature exposure, and mechanical damage from vibration or improper installation.

How do you test a bimetal disc's functionality?

Test using controlled heating to verify trip/reset temperatures, measure contact resistance (<50mΩ), check insulation resistance (>100MΩ), and verify snap-action response time. Specialized thermal chambers with precision temperature control are required for accurate testing.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.