Spring Actuator for Thermal Disconnectors

Product Specifications

Technical details and manufacturing context for Spring Actuator

Definition

The spring actuator is a critical safety component within thermal disconnectors, designed to convert thermal energy into mechanical motion. It typically consists of a calibrated spring mechanism that is held in a compressed state. When the ambient or monitored temperature exceeds a predetermined threshold, a thermal element (e.g., a fusible link, bimetallic strip, or wax actuator) releases or deforms, allowing the stored energy in the spring to be rapidly released. This action physically drives the disconnector's contacts apart, thereby interrupting the electrical circuit to prevent overheating, fire, or equipment damage. The actuator operates on a stored-energy principle. A spring is compressed and latched. A temperature-sensitive element acts as the latch. Upon reaching its activation temperature, this element fails or changes state, releasing the latch. The spring's potential energy is converted to kinetic energy, providing the forceful, rapid linear or rotational motion required to open the disconnector's contacts reliably and decisively. This component is typically used in electrical equipment manufacturing, where thermal protection is essential. It is available in various configurations, with materials such as spring steel (e.g., 65Mn, 60Si2MnA) for the spring, stainless steel for corrosion resistance, and high-temperature plastics or polymers for insulating parts. Key parameters include an operating temperature range of -40 to 85 °C, a rated voltage of 24 V DC ±10%, contact resistance of ≤50 mΩ, mechanical life of at least 10,000 cycles, spring force of 5–15 N, response time of ≤10 ms, insulation resistance of ≥100 MΩ at 500 V DC, dielectric strength of 1500 V AC for 1 minute, IP rating of IP54–IP65 per IEC 60529, material of stainless steel 304 per ASTM A240, weight of 15–25 g, and typical dimensions of 20×10×8 mm. These values are reference ranges and must be verified for the specific model and application. Always confirm model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The actuator operates on a stored-energy principle. A spring is compressed and latched. A temperature-sensitive element acts as the latch. Upon reaching its activation temperature, this element fails or changes state, releasing the latch. The spring's potential energy is converted to kinetic energy, providing the forceful, rapid linear or rotational motion required to open the disconnector's contacts reliably and decisively.

Common Materials

Spring Steel (e.g., 65Mn, 60Si2MnA), Stainless Steel (for corrosion resistance), High-Temperature Plastics/Polymers (for insulating components)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Operating Temperature Range	-40–85 °C	Beyond this range, spring force may degrade.
Rated Voltage	24 ±10% V DC	For actuation signal.
Contact Resistance	≤50 mΩ	Initial value; ensures reliable connection.
Mechanical Life	10000 cycles	Minimum operations without failure.
Spring Force	5–15 N	At operating temperature; ensures disconnection.
Response Time	≤10 ms	Time to initiate disconnection after trigger.
Insulation Resistance	≥100 MΩ	At 500 V DC; ensures safety.
Dielectric Strength	1500 V AC	Withstands 1 minute without breakdown.
IP Rating	IP54–IP65	Protection against dust and water.IEC 60529
Material	Stainless steel 304	Corrosion-resistant for spring and housing.ASTM A240
Weight	15–25 g	Varies with size; affects mounting.
Dimensions	20×10×8 mm	Typical envelope; custom available.

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

Compression Spring Part
Stores mechanical energy and provides the driving force for contact separation.

Material: Spring Steel
Actuator Rod/Pawl Part
Transmits the spring force to the moving contact assembly of the disconnector.

Material: Steel or Stainless Steel
Thermal Release Element
Senses temperature and acts as a latch; fails or deforms at the set point to release the spring.

Material: Fusible Alloy, Bimetal, or Wax
Housing/Guide Part
Contains and guides the spring and rod, ensuring linear motion and alignment.

Material: High-Temperature Plastic or Ceramic

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Spring Actuator.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Thermal Disconnector

View system integration details

Manufacturers of Spring Actuator

Manufacturer profiles associated with Spring Actuator.

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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 operating temperature range of this spring actuator?

The reference operating temperature range is -40 to 85 °C. Beyond this range, spring force may degrade. Always verify the exact range for your specific model with the manufacturer.

What is the response time of the actuator?

The response time to initiate disconnection after trigger is ≤10 ms. This ensures rapid circuit interruption. Confirm the actual response time for your application with the supplier.

What materials are used in the spring actuator?

Typical materials include spring steel (e.g., 65Mn, 60Si2MnA) for the spring, stainless steel for corrosion resistance, and high-temperature plastics or polymers for insulating components. The housing may be stainless steel 304 per ASTM A240. Verify material suitability for your environment.

What is the mechanical life of the actuator?

The mechanical life is at least 10,000 cycles without failure. This is a reference value; actual life depends on operating conditions. Check with the manufacturer for your specific usage.

Data Basis

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

Preliminary Technical Classification

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pressure:	Up to 10 bar (1000 kPa) maximum system pressure
other spec:	Spring force: 50-500 N, Response time: <2 seconds at threshold temperature, Cycle life: 10,000+ actuations
temperature:	-40°C to +150°C (operating range), activation typically 70-120°C

Spring Actuator

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards