Trip Spring: Deflection Range 8-12 mm, Operating Force 15-25 N

Component Specifications

Definition

The Trip Spring is a calibrated mechanical component within magnetic trip units of circuit breakers, designed to store and release energy to rapidly separate contacts when electromagnetic forces exceed predetermined thresholds, ensuring reliable interruption of electrical faults.

Working Principle

Operates on Hooke's law (F=kx) where spring compression stores mechanical energy. During normal operation, magnetic forces balance spring tension. When fault currents generate sufficient electromagnetic force to overcome spring tension, the spring releases stored energy, actuating the trip mechanism to open contacts within milliseconds.

Materials

High-carbon spring steel (SAE 1074/1075) or stainless steel (AISI 302/316) with corrosion-resistant plating (zinc-nickel or cadmium) for harsh environments; operating temperature range: -40°C to +85°C.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Cycle Life	>10,000 operations
Spring Rate	2.5-4.5 N/mm
Operating Force	15-25 N
Deflection Range	8-12 mm
Corrosion Resistance	Salt spray test >500 hours

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

Standards

ISO 13849-1, IEC 60947-2, UL 489

Parent Products

This component is used in the following industrial products

Magnetic Trip Unit

A protective component in circuit breakers that detects and responds to short-circuit currents using electromagnetic principles.

View Product Details

Engineering Analysis

Risks & Mitigation

Spring fatigue leading to failure to trip
Corrosion-induced binding
Incorrect calibration causing nuisance tripping

FMEA Triads

Trigger: Material fatigue from repeated compression cycles
Failure: Spring loses elasticity, fails to provide sufficient trip force
Mitigation: Use fatigue-resistant alloys, implement predictive maintenance with cycle counting

Trigger: Corrosion in humid/chemical environments
Failure: Increased friction prevents smooth operation
Mitigation: Apply corrosion-resistant coatings, use stainless steel materials

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±5% spring rate, ±2% operating force

Test Method

IEC 60947-2 Annex M: Mechanical endurance testing with 10,000 operations at rated current

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Trip Spring

Manufacturer profiles associated with Trip Spring.

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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

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Frequently Asked Questions

What causes trip spring failure in magnetic trip units?

Common failures include material fatigue from cyclic loading, corrosion in humid environments, improper calibration causing premature tripping, and mechanical binding due to contamination.

How often should trip springs be inspected?

Annual inspection recommended per IEC 60947-2; more frequent checks (6 months) in high-cycling or corrosive environments. Replace if corrosion exceeds 10% surface area or spring rate deviation >15%.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Trip Spring