AH Series Four-Terminal Precision Shunt Resistors
Four-terminal (Kelvin) precision shunt resistor construction
Power ratings of 3W and 10W
Resistance range 1mΩ to 100Ω
Tolerance options ±0.1%, ±0.5%, and ±1%
TCR ±10 ppm/°C
Separate voltage sense and current-carrying terminals for elimination of contact resistance error
Suitable for precision current measurement, instrumentation, and test and measurement applications
What are the AH Series Four-Terminal Precision Shunt Resistors?
The AH is a four-terminal precision shunt resistor designed for high-accuracy current measurement in instrumentation, laboratory, and industrial power electronics applications. Its Kelvin connection architecture maintains a strict separation between the current-carrying terminals and the voltage sense terminals. By routing the measurement signal through dedicated sense connections that carry no load current, the AH eliminates the contact resistance and lead resistance errors inherent in conventional two-terminal shunt designs, enabling repeatable and accurate voltage-drop readings directly proportional to the current under measurement.
The resistance range of 1mΩ to 100Ω covers both the low-resistance requirements of high-current sensing applications and the higher-resistance needs of lower-current precision measurement circuits. Power ratings of 3W and 10W provide a choice of physical size and continuous dissipation capability to suit the current level and thermal environment of the target application. Tolerance options of ±0.1%, ±0.5%, and ±1% allow the designer to select the grade of accuracy appropriate to the measurement system, from laboratory-grade instrumentation down to general industrial monitoring. The temperature coefficient of resistance of ±10 ppm/°C is among the tightest available for a shunt resistor of this type, ensuring that the resistance value — and therefore the current measurement — remains stable across the operating temperature range without the need for external temperature compensation.
The four-terminal configuration also provides immunity to the effects of connector and terminal block contact resistance variation that would otherwise introduce offset and drift errors in two-terminal shunt installations. This makes the AH particularly well suited to precision power analyzers, calibration equipment, and laboratory current sources where measurement integrity must be maintained over extended periods and across varying connection conditions. The series is offered by both RARA Electronics and RMS as part of their precision current sensing portfolios, reflecting the component's established role in demanding measurement applications.
AH Series Four-Terminal Precision Shunt Resistors Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: AH
Resistor type: Current sensing
Description: Four terminal precision
Power Rating: 3W, 10W
Resistance (Ω): 1m~100
Tolerance (%): ±0.1, ±5, ±1
TCR (ppm/C): 10
Applications of the AH Series Four-Terminal Precision Shunt Resistors
Where RARA metal clad resistors are deployed in the field.
Test and measurement instruments — precision power analyzers, current clamp meters, and laboratory current sources requiring Kelvin-connected sense paths
Calibration equipment — resistance and current standards where long-term stability and tight TCR are essential
Battery test systems — accurate charge and discharge current measurement in formation cycling and capacity testing jigs
Industrial power conversion circuits — current monitoring in DC-DC converters, rectifiers, and regulated power supplies
Precision power sources — closed-loop current regulation and output current sensing feedback
Energy metering — sub-milliohm current sensing in billing-grade electricity meters requiring stable long-term accuracy
Motor drive and servo systems — phase current measurement for torque control and overload protection
Hybrid and electric vehicle powertrain electronics — battery management and traction current sensing
Fuel cell and hydrogen energy systems — stack current monitoring and output current measurement
Research and development laboratories — general-purpose precision current sensing across a wide resistance and power range
Related Products of the AH Series Four-Terminal Precision Shunt Resistors
Model: RMF
Resistor type: Precision
Description: High power 4 terminal
Power Rating: 10W
Resistance (Ω): 0.5~200
Tolerance (%): ±0.1~±5
TCR (ppm/C): 5, 10, 15, 20, 30
Model: PCR4T
Resistor type: Current sensing
Description: Through Hole
Power Rating: 3W
Resistance (Ω): 1m-10m
Tolerance (%): ±0.5, ±1, ±5
TCR (ppm/C): 30
Model: HPCR4T
Resistor type: Current sensing
Description: Through Hole
Rated Current: 35-65A
Resistance (Ω): 0.5m-4m
Tolerance (%): ±0.5, ±1
TCR (ppm/C): 30
Model: PBV, PBH
Resistor type: Current sensing
Description: Four terminal precision
Power Rating: 3W, 10W
Resistance (Ω): 0.5m~100m
Tolerance (%): ±0.5, ±1, ±5
TCR (ppm/C): 30, 50
Why Choose RARA Current Sensing Resistors
What sets RARA apart for engineers and procurement managers in industrial and automotive markets.
01
8 Sub-Categories
No other single supplier covers AEC-Q200 chip shunts, milliohm precision types, four-terminal Kelvin shunts, power metering, and 12,000A panel shunts under one ISO-certified roof.
02
Extreme Precision
HPS, UHPS, and PSS precision shunts deliver ±0.05% tolerance and 3 ppm/°C TCR — meeting the accuracy demands of EV battery coulomb counting, precision power analyzers, and billing-grade energy metering.
03
Automotive Qualified
Multiple AEC-Q200 certified models (BCS, LRA, ECS, BWR, TCS, PCBS) with IATF 16949 manufacturing certification — covering EV battery management, motor control, and charging applications.
04
Global Track Record
Trusted by Tesla, GM Korea, Proterra, Siemens, Rockwell, and Schneider Electric — deployed in EV powertrains, industrial drives, and utility metering systems across six continents.
