INDUSTRY COMPONENT

Shunt Resistor (R2)

A shunt resistor (R2) is a precision electrical component used in voltage divider networks to measure current by creating a known voltage drop proportional to the current flow.

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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
  • 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
Standards
ISO 16750-2, IEC 60115-1, DIN 44050

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Shunt Resistor (R2).

shunt resistor current shunt voltage divider resistor precision resistor R2 component industrial resistor current measurement electrical equipment Shunt Resistor (R2) Shunt Resistor (R2) in Electrical Equipment Manufacturing

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

Interchangeable Parts

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

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

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.

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.

Why are shunt resistors made from manganin?

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

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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