Shunt Resistor: Resistance Range 0.1 mΩ to 100 mΩ

Component Specifications

Definition

A shunt resistor is a low-resistance precision component designed to be placed in series with an electrical circuit to measure current flow. It operates on Ohm's Law (V=IR), where the voltage drop across the resistor is directly proportional to the current passing through it. This voltage signal is then measured by monitoring circuits (such as operational amplifiers or ADCs) to determine the actual current value. Shunt resistors are critical for overcurrent protection, power monitoring, battery management, and motor control systems in industrial applications.

Working Principle

Operates on Ohm's Law (V=IR). When current flows through the shunt resistor, it creates a small, precise voltage drop across its terminals. This voltage is measured by a sensing circuit (typically using differential amplifiers) and converted into a current reading. The resistor's low resistance value minimizes power loss and heating while maintaining measurement accuracy.

Materials

Manganin (Cu-Mn-Ni alloy), Zeranin (Cu-Ni-Mn alloy), Constantan (Cu-Ni alloy), or precision metal foil on ceramic substrates. Terminal connections are typically made of copper or brass with tin/lead or nickel plating.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Tolerance	±0.1% to ±1%
Power Rating	1W to 50W
Voltage Rating	50V to 600V
Maximum Current	10A to 500A
Resistance Range	0.1 mΩ to 100 mΩ
Temperature Coefficient	±10 ppm/°C to ±50 ppm/°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 16750-2, DIN EN 60115-1, IEC 60115-8

Parent Products

This component is used in the following industrial products

Current Sensing Circuit

A circuit that measures and monitors the electrical current flowing through a system.

View Product Details

Voltage and Current Sensors

Electronic components that measure voltage and current parameters in electrical systems

View Product Details

Engineering Analysis

Risks & Mitigation

Thermal runaway due to excessive current
Measurement inaccuracy from temperature drift
Mechanical failure from vibration or thermal cycling
Corrosion of terminals in harsh environments

FMEA Triads

Trigger: Overcurrent condition exceeding power rating
Failure: Resistor overheating leading to permanent resistance change or open circuit
Mitigation: Implement current limiting circuits, use resistors with adequate power derating, and install thermal protection devices

Trigger: Poor solder joints or mechanical connections
Failure: Increased contact resistance causing measurement errors or intermittent connections
Mitigation: Follow proper soldering procedures, use appropriate terminal connectors, and implement regular inspection protocols

Trigger: Environmental contamination or moisture ingress
Failure: Corrosion of resistive element or terminals leading to resistance drift
Mitigation: Use conformal coatings, select appropriate enclosure ratings (IP ratings), and maintain controlled environments

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1% to ±1% depending on accuracy requirements

Test Method

Four-wire Kelvin measurement to eliminate lead resistance errors, temperature cycling tests, power cycling tests, and vibration testing per IEC 60068 standards

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 Shunt Resistor

Manufacturer profiles associated with Shunt Resistor.

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Frequently Asked Questions

Why are shunt resistors made with specific alloys like Manganin?

Manganin and similar alloys have extremely low temperature coefficients of resistance, meaning their resistance changes very little with temperature variations. This ensures accurate current measurements across different operating temperatures in industrial environments.

How do I select the right shunt resistor for my application?

Consider these factors: 1) Maximum current to be measured, 2) Required accuracy (tolerance), 3) Power dissipation capability, 4) Operating temperature range, 5) Physical size constraints, and 6) Compliance with industry standards for your specific application.

What's the difference between a shunt resistor and a current transformer?

Shunt resistors provide direct current measurement through voltage drop and work with both AC and DC currents. Current transformers use electromagnetic induction, only work with AC currents, and provide galvanic isolation. Shunt resistors are generally more compact and cost-effective for lower current applications.

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.

Shunt Resistor