INDUSTRY COMPONENT

Thermal Sensor / Fusible Alloy

Thermal sensor with fusible alloy for temperature-based circuit disconnection in electrical equipment.

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Component Specifications

Definition
A thermal protection component that uses a fusible alloy element designed to melt at a specific temperature threshold, thereby mechanically or electrically disconnecting a circuit to prevent overheating damage in electrical machines and devices.
Working Principle
The fusible alloy is calibrated to melt at a precise temperature (typically between 70°C-150°C). When ambient or component temperature reaches this threshold, the alloy liquefies, triggering a mechanical spring or contact mechanism to open the circuit, interrupting current flow and preventing thermal damage.
Materials
Fusible alloy (typically bismuth-tin-lead-cadmium or lead-free alternatives like bismuth-tin-indium), copper terminals, ceramic or polymer housing, spring mechanism.
Technical Parameters
  • Response Time <5 seconds at threshold
  • Terminal Type Quick-connect or screw terminals
  • Current Rating 1A-30A
  • Voltage Rating 250V AC/DC
  • Housing Material UL94 V-0 rated polymer or ceramic
  • Melting Temperature 72°C-150°C (customizable)
  • Operating Temperature Range -40°C to +85°C
Standards
ISO 8820, DIN 72581-3, UL 248, IEC 60269

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Thermal Sensor / Fusible Alloy.

thermal sensor fusible alloy thermal disconnector overheating protection circuit breaker temperature fuse electrical safety device bimetallic alternative Thermal Sensor / Fusible Alloy Thermal Sensor / Fusible Alloy in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Thermal Disconnector

A safety component within a Surge Protection Device (SPD) that automatically disconnects the circuit when excessive heat is detected, preventing fire hazards.

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Engineering Analysis

Risks & Mitigation
  • Single-use (non-resettable)
  • Environmental temperature affects calibration
  • Mechanical damage can cause false triggering
  • Alloy degradation over time at high temperatures
FMEA Triads
Trigger: Alloy contamination during manufacturing
Failure: Inconsistent melting temperature
Mitigation: Strict material purity controls and batch testing
Trigger: Vibration-induced mechanical stress
Failure: Premature fracture or disconnection
Mitigation: Shock-absorbing mounting and strain relief design
Trigger: Oxidation of alloy surface
Failure: Increased melting temperature over time
Mitigation: Protective coatings and hermetic sealing

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±3°C melting temperature tolerance, ±10% current rating tolerance
Test Method
Temperature ramp testing in controlled oven with current load simulation, vibration testing per IEC 60068-2-6, dielectric strength testing at 2x rated voltage

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 is the difference between fusible alloy sensors and bimetallic thermal protectors?

Fusible alloy sensors provide one-time irreversible protection by melting at a specific temperature, while bimetallic devices can reset after cooling. Fusible alloys offer more precise temperature triggering and are used where resetting isn't required or could be dangerous.

Can fusible alloy thermal sensors be used in high-vibration environments?

Yes, when properly housed in vibration-resistant casings. The solid alloy remains stable until melting point, but mounting should minimize mechanical stress that could cause premature failure.

Are lead-free fusible alloys available for RoHS compliance?

Yes, modern formulations use bismuth-tin-indium or other lead-free alloys with similar melting characteristics while meeting environmental regulations.

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.

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