Shunt Resistor (R2): Power Rating 1W to 50W

Q: What is the purpose of R2 in a voltage divider network?

R2 determines the output voltage ratio and enables current sensing by creating a known voltage drop proportional to current flow.

Q: How do I select the right shunt resistor value?

Choose based on maximum current (to limit voltage drop), power dissipation requirements, and desired measurement resolution while maintaining circuit safety.

Q: Why are shunt resistors made from manganin?

Manganin alloy provides extremely low temperature coefficient of resistance (TCR), ensuring stable performance across temperature variations.

Component Specifications

Definition

A shunt resistor (R2) is a low-resistance precision resistor designed to be connected in parallel (shunt) with a load or circuit element in a voltage divider configuration. It creates a measurable voltage drop (V = I × R) when current flows through it, allowing indirect current measurement without interrupting the circuit. In industrial voltage divider networks, R2 works with series resistor R1 to scale down high voltages to measurable levels for monitoring, protection, or control systems. These components feature high accuracy, low temperature coefficient, and excellent long-term stability for reliable operation in harsh industrial environments.

Working Principle

The shunt resistor operates on Ohm's Law (V = I × R). When current flows through the resistor, it generates a voltage drop proportional to the current. In a voltage divider network with R1 and R2, the output voltage (Vout) is calculated as Vout = Vin × (R2/(R1 + R2)). This allows high input voltages to be reduced to safe, measurable levels for instrumentation, while the shunt's precise resistance enables accurate current sensing when placed in parallel with the load.

Materials

Manganin or constantan alloy (for low temperature coefficient), ceramic substrate, nickel or copper terminals, protective epoxy coating. High-purity materials ensure stability under thermal and electrical stress.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Tolerance	±0.1% to ±1%
Resistance	0.001Ω to 10Ω
Power Rating	1W to 50W
Voltage Rating	Up to 600V
Operating Temperature	-55°C to +155°C
Temperature Coefficient	<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, IEC 60115-1, DIN 44050

Parent Products

This component is used in the following industrial products

Voltage Divider Network

A passive linear circuit that produces an output voltage that is a fraction of its input voltage.

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Engineering Analysis

Risks & Mitigation

Overheating due to excessive current
Measurement inaccuracy from poor calibration
Mechanical damage to terminals
Insulation breakdown at high voltages

FMEA Triads

Trigger: Excessive current exceeding power rating
Failure: Resistor overheating and permanent resistance change
Mitigation: Implement current limiting circuits and thermal monitoring

Trigger: Poor solder connections or terminal corrosion
Failure: Increased contact resistance causing measurement errors
Mitigation: Use proper soldering techniques and protective coatings

Trigger: Vibration or mechanical stress
Failure: Resistor element damage or connection failure
Mitigation: Secure mounting and vibration-resistant design

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1% to ±1% depending on accuracy requirements

Test Method

Four-wire Kelvin measurement for accurate resistance verification, temperature cycling tests, power derating validation

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 (R2)

Manufacturer profiles associated with Shunt Resistor (R2).

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Frequently Asked Questions

What is the purpose of R2 in a voltage divider network?