Wiper/contact: Current Rating 10mA-100mA

Component Specifications

Definition

A wiper/contact is the critical moving component in potentiometers and certain sensors that maintains electrical contact with a resistive element while sliding along its surface. It functions as the variable tap point, enabling precise measurement of position, displacement, or angular rotation by changing the resistance ratio in the circuit. This component directly determines measurement accuracy, resolution, and signal stability in industrial control systems.

Working Principle

The wiper/contact operates on the principle of variable resistance through physical contact. As it moves along a resistive track (carbon, conductive plastic, or wirewound), it creates an electrical connection at a specific point, dividing the total resistance proportionally to its position. This generates a voltage output corresponding to mechanical displacement, which is measured to determine position, angle, or linear movement in industrial applications.

Materials

Beryllium copper alloy (C17200) with gold plating (0.5-2.0μm), phosphor bronze (C51000), or stainless steel (316L) for corrosive environments. Contact tips often use precious metal alloys (palladium-silver, platinum-iridium) for low contact resistance and wear resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Travel Life	≥1×10^7 cycles
Current Rating	10mA-100mA
Operating Force	10-50gf
Contact Resistance	≤10mΩ
Vibration Resistance	10-2000Hz, 10G
Insulation Resistance	≥100MΩ @ 500VDC
Operating Temperature	-40°C to +125°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

IEC 60393-1, DIN 41494

Parent Products

This component is used in the following industrial products

Potentiometer/Sensor

A variable resistor or sensing device that converts mechanical position into electrical signals within a joystick or control lever.

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Engineering Analysis

Risks & Mitigation

Contact oxidation leading to signal drift
Mechanical wear causing increased resistance
Contamination from industrial particulates
Fatigue failure from vibration exposure

FMEA Triads

Trigger: Abrasive wear from particulate contamination
Failure: Increased contact resistance and signal noise
Mitigation: Implement sealed housing with IP67 rating and regular cleaning protocols

Trigger: Material fatigue from high-frequency cycling
Failure: Contact spring fracture and complete signal loss
Mitigation: Use fatigue-resistant alloys and design with appropriate safety factors for expected cycle counts

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5% linearity, ±0.1mm positional accuracy

Test Method

IEC 60393-1 for electrical characteristics, MIL-STD-202 for environmental testing, ISO 16750 for automotive applications

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 Wiper/contact

Manufacturer profiles associated with Wiper/contact.

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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 wiper contact failure in industrial potentiometers?

Primary failure causes include wear debris accumulation, oxidation of contact surfaces, mechanical fatigue from excessive operating force, and contamination from industrial environments. Regular maintenance and proper sealing can extend service life significantly.

How does wiper material affect sensor performance?

Material selection directly impacts contact resistance stability, wear characteristics, and corrosion resistance. Gold-plated beryllium copper offers optimal balance for most applications, while precious metal alloys provide superior performance in harsh environments with minimal oxidation.

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.

Wiper/contact