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Bimetal Strip Component – Electrical Equipment Manufacturing

Component Specifications

Definition

A precision-engineered component consisting of two bonded metal strips with different coefficients of thermal expansion, designed to bend predictably when heated by electrical current, thereby actuating the trip mechanism in circuit breakers to interrupt power during overload conditions.

Working Principle

Operates on differential thermal expansion: when current flows through or near the strip, resistive heating causes the metals to expand at different rates, creating mechanical deflection that triggers the trip mechanism at a calibrated temperature threshold.

Materials

Typically composed of high-conductivity copper or nickel-iron alloy bonded to low-expansion invar or manganese-nickel alloy, with specific thickness ratios (e.g., 1:1 to 3:1) and bonding via rolling, welding, or cladding.

Technical Parameters

Response Time 2-30 seconds depending on overload
Deflection Angle 15-45 degrees at trip point
Electrical Resistance 0.1-10 mΩ depending on design
Trip Current Accuracy ±10% of rated current
Operating Temperature Range -40°C to 150°C

Standards

IEC 60947-2, UL 489, ISO 8820-2

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bimetal Strip.

Parent Products

This component is used in the following industrial products

Trip Mechanism (Circuit Breaker)

The internal mechanism within a circuit breaker that detects abnormal electrical conditions and triggers the opening of contacts to interrupt current flow.

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Engineering Analysis

Risks & Mitigation

Fatigue failure from repeated cycling
Calibration drift due to material aging
Contamination affecting thermal response

FMEA Triads

Trigger: Material fatigue from thermal cycling
Failure: Reduced deflection sensitivity leading to missed trips
Mitigation: Use fatigue-resistant alloys and design for minimum stress concentrations

Trigger: Corrosion at bonding interface
Failure: Delamination and loss of thermal response
Mitigation: Apply protective coatings and ensure clean bonding surfaces

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Trip current tolerance ±10%, deflection repeatability ±5%

Test Method

Thermal cycling test per IEC 60947-2, current injection testing with infrared thermography

Buyer Feedback

★★★★☆ 4.5 / 5.0 (36 reviews)

"The Bimetal Strip we sourced perfectly fits our Electrical Equipment Manufacturing production line requirements."

"Found 40+ suppliers for Bimetal Strip on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Bimetal Strip is very thorough, especially regarding technical reliability."

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Frequently Asked Questions

How does a bimetal strip protect against electrical overload?

It bends when heated by excessive current, mechanically triggering the circuit breaker to open and interrupt the circuit.

Can bimetal strips be calibrated for different trip currents?

Yes, through material selection, thickness ratios, and mechanical pre-tensioning during manufacturing.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Bimetal Strip