Precision Low-Resistance Component Shunt Measurement And Range Extension

Price Negotiable

Price: Negotiable

MOQ: 5000PCS

Delivery Time: 5-7 days

Brand: UCHI

Product Description

Shunt

A shunt has different meanings in various fields. The most common is a precision low-resistance component in the electronics and power industry, used for high-current measurement and range extension.

I. Electronics / Power Industry (Most Common)

1. Core Definition and Principle

Nature: A low-resistance, high-precision power resistor (in milliohm/microohm scale).
Principle: Connected in series in the measured circuit. A high current produces a millivolt-level voltage drop (U=I×R), and the current is calculated indirectly by measuring the voltage.
Typical specifications: Rated voltage drop is mostly 75mV/100mV. For example, 100A/75mV corresponds to a resistance of 0.75mΩ.

2. Main Applications

High-current measurement: Used with millivoltmeters / multimeters to measure high DC current (from dozens to tens of thousands of amperes).
Range extension: Connected in parallel with a low-range ammeter to shunt most of the current, allowing only a small portion to pass through the meter.
Current sampling: Used for current monitoring and protection in BMS, motor control, power supplies, charging piles, and energy storage systems.

3. Key Parameters and Selection

Rated current: Ranges from 5A to 15kA.
Rated voltage drop: 60mV, 75mV, 100mV, 150mV, etc.
Accuracy: 0.1%, 0.2%, 0.5%, 1%, etc.
Material: Usually manganin alloy (low temperature coefficient, good stability).
Heat dissipation: High-current applications require good heat dissipation to prevent accuracy loss due to temperature rise.

4. Advantages and Disadvantages

Advantages: Simple structure, low cost, high DC accuracy, suitable for high currents.
Disadvantages: Voltage drop loss, heat generation, non-isolated, and accuracy affected by reactance at high frequencies.

II. “Shunt” in Other Fields

1. Network Shunt (Traffic Replication / Load Balancing)

Copies / forwards network traffic for monitoring, auditing, intrusion detection, and load balancing.

2. Hydraulic / Pneumatic Shunt

Distributes fluid evenly to multiple outputs, used in hydraulic systems and lubrication systems.

3. Faucet Shunt (Household)

One-inlet, multi-outlet water splitter with independent switches, used for washing machines, showers, etc.

III. Usage Notes

Must be connected in series in the measured circuit.
Rated current should be higher than the actual maximum current (20% margin recommended).
Secure wiring to reduce contact resistance; four-wire connection is recommended for high-precision measurement.
Pay attention to heat dissipation to avoid overheating.
Mainly used for DC or low-frequency AC; use with caution in high-frequency applications.