Shunt

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)

2. Hydraulic / Pneumatic Shunt

3. Faucet Shunt (Household)

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.

Uchi was established in 2006 in Dongguan, China. 

After years of development, Uchi has become a large scale hi-tech enterprise that specialized in development and production of complete series of MOV,PTC, NTC series, PPTC series, Fuse(ALL TYPE),Resistor、integrated circuit 、 Capacitor, surge protector and protective devices of lightning protection products. It ranks front in the industry and has heartquarter in Hong Kong. With its excellent technology and quality products, Uchi has won wide recognition of overseas customers. Saini Impex PVT.LTD is our authorized sole distributor in india .

China's leading enterprise of circuit protection components​

Our strength ：

A large number of product series in our factory have passed the certification of various international standards




Factory Tour​ ：

Advanced equipment, lean production

Uchi boasts with a production base that covers an area of nearly 15000 square meters.
 

We successively imported high-tech fully automated production equipments and high precision testing instruments and have put into production to realize the automation, large scale and standardization.

Uchi has a galaxy of hi-tech talent teams headed up by national class experts to engage in the work of product development, product quality control, sales andservice technical support, etc., and has successively obtained tens of certificates of appearance patents, utility patents and inventions.
 

To guarantee the quality, we successfully passed the certification of ISO9001:2008 quality management system, scientific and efficient managing mode to carry out lean production and form scientific and efficient quality control system. The products are certified with UL, CUL, TUV, VDE, CSA and SGS, RACH 73 environmentally friendly testing certifications.

Exquisite quality at customers' favor

Uchi is an export membership of Alibaba with free import and export rights. It is appraised as Guangdong Famous Star Enterprise and Dongguan Private Enterprise. Our products have doubled and redoubled to provide more kinds and high quality and reliable products and service. Our products mainly consist of: 

Metal Oxide Varistor
DIP Varistor & SMD Varistor
Thermally Protected Varistor

DC-Link Capacitor for New energy vehicles supporting the HEVEV

Automotive Fuse Links for EV Plugin HEV FCEV
PTC Thermistor

NTC Thermistor

PPTC Resettable Fuse

Thermal Fuse

Auto Blade Fuse

Glass Fuses

Metal Film Resistor

Carbon Film Resistor

Cement Resistor

NTC Temperature Sensor

CDS Photoconductive Cell

Our products are widely used in New energy vehicles, home appliance, medical equipment, office equipment, communication equipment, phone battery, electronic calendar, electronic thermometer and temperature controller to cover military telecommunications, IT, automobile and consumer electronic fields.
Cooperation with good faiths to win in the market.
Excellent quality sincere service is the key to the success of Uchi. 

In the future Uchi will still stick to the tenets of "Quality first, customer foremost." "First class quality, first class service and customersatisfaction" to manufacture the high quality, technically advanced and reasonable prices products. We hope to trigger with global partners the revolution in resistor products. We cordially welcome friends from home and abroad to visit us for guidance and cooperation.