Fixed Contacts: Rated Voltage Up to 1000V AC/DC

Component Specifications

Definition

Fixed contacts are stationary conductive elements within diverter switches that establish permanent electrical connection points. They work in conjunction with moving contacts to enable circuit switching by providing reliable mating surfaces for current transfer during switch operation. These components maintain consistent positioning to ensure proper alignment and electrical continuity.

Working Principle

Fixed contacts remain stationary while moving contacts make or break electrical connections against them. When the diverter switch operates, moving contacts engage with fixed contacts to complete circuits or disengage to interrupt current flow. The fixed contacts provide stable, low-resistance surfaces for electrical conduction during switch closure.

Materials

Copper alloys (typically C11000 or C17200), silver plating (AgCdO or AgSnO2), sometimes with gold flash for corrosion resistance

Technical Parameters

Parameter	Typical range	Notes & selection driver
Contact Force	5-50N
Rated Current	10-1000A
Rated Voltage	Up to 1000V AC/DC
Contact Resistance	< 0.5 mΩ
Dielectric Strength	> 2500V AC
Insulation Resistance	> 1000 MΩ
Operating Temperature	-40°C to +85°C

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 8820, DIN 43620, IEC 60947

Parent Products

This component is used in the following industrial products

Diverter Switch

A switching device within a tap changer that physically transfers the load current from one tap to another without interrupting the circuit.

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Engineering Analysis

Risks & Mitigation

Contact welding due to high current
Oxidation leading to increased resistance
Mechanical wear from repeated operation
Thermal degradation from overheating

FMEA Triads

Trigger: Overcurrent conditions
Failure: Contact welding or melting
Mitigation: Implement current limiting devices and proper switch rating selection

Trigger: Environmental contamination
Failure: Increased contact resistance and arcing
Mitigation: Use sealed switch enclosures and regular maintenance cleaning

Trigger: Mechanical misalignment
Failure: Incomplete contact and overheating
Mitigation: Precision mounting and regular alignment checks

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1mm dimensional tolerance, ±5% electrical resistance tolerance

Test Method

Contact resistance measurement (4-wire method), dielectric strength testing, thermal cycling tests

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Fixed Contacts

Manufacturer profiles associated with Fixed Contacts.

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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 is the purpose of silver plating on fixed contacts?

Silver plating reduces contact resistance, prevents oxidation, and improves electrical conductivity and durability.

How do fixed contacts differ from moving contacts in diverter switches?

Fixed contacts remain stationary while moving contacts move to make or break connections. Fixed contacts provide consistent mating surfaces.

What maintenance do fixed contacts require?

Periodic inspection for wear, pitting, or oxidation; cleaning with appropriate solvents; and replacement when contact resistance increases beyond specifications.

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.

Fixed Contacts