SH-Fm Series High Amperage Shunt Resistors
Interchangeable shunt resistor for current measurement range extension in metering and power electronics
Resistance range 0.2mΩ to 16mΩ
Rated current range 1A to 2500A
Rated voltage drop 25mV to 100mV depending on model configuration
Tolerance options ±0.5%, ±1%, and ±5%
TCR options of 50 and 100 ppm/°C
Operating ambient temperature −25°C to +40°C, relative humidity ≤80% at 35°C
Compact flat construction enabling direct panel and instrument mounting
What are the SH-Fm Series High Amperage Shunt Resistors?
The SH-Fm is a flat-format interchangeable shunt resistor designed to extend and multiply the current measurement range of ammeters and precision measurement instruments. By placing a calibrated low-resistance element in the current path and measuring the resulting millivolt-level voltage drop, the SH-Fm allows instruments with fixed input ranges to accurately monitor currents from as little as 1A up to 2500A without requiring bulky current transformers or custom sensing arrangements. The interchangeable construction means shunts can be swapped between instrument setups to reconfigure the measurement range, a feature particularly valued in calibration laboratories and multi-range panel installations.
The resistance range spans 0.2mΩ to 16mΩ, selected according to the rated current and the desired voltage output. Rated voltage drop options of 25mV, 50mV, 60mV, 75mV, and 100mV accommodate a wide variety of connected instrumentation standards. For lower current models in the 1A to 150A range, physical dimensions scale with the rated voltage and current combination, with body lengths between 45mm and 78mm and widths between 28mm and 33mm, ensuring a compact footprint even at the upper end of the lighter current variants. Models rated for 51A to 2500A are built to handle the correspondingly larger continuous dissipation, with resistance values stepping down into the sub-milliohm range.
Tolerance grades of ±0.5%, ±1%, and ±5% allow the SH-Fm to be specified at accuracy levels ranging from general-purpose panel metering through to precision instrumentation. Two TCR grades, 50 ppm/°C and 100 ppm/°C, provide flexibility to match the thermal stability requirement of the application. The operating envelope of −25°C to +40°C ambient and relative humidity up to 80% at 35°C confirms suitability for indoor industrial, transportation, and telecommunications environments where controlled but non-hermetic conditions prevail.
SH-Fm Series High Amperage Shunt Resistors Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: SH-Fm
Resistor type: Current sensing
Description: High amperage shunt
Rated Current: 1A~2500A max.
Resistance (Ω): 0.2m~16m
Tolerance (%): ±0.1, ±1, ±5
TCR (ppm/C): 50, 100
Applications of the SH-Fm Series High Amperage Shunt Resistors
Where RARA metal clad resistors are deployed in the field.
Telecommunications power equipment requiring accurate DC current monitoring of rectifier and battery systems.
Electric vehicle drivetrains and battery management systems measuring charge, discharge, and regenerative braking currents.
Aerospace power distribution panels where compact, interchangeable current sensing elements are required for weight-critical installations.
Electric vehicle charging stations monitoring cable and charger output currents for billing accuracy and protection functions.
Electroplating and electrolytic processing power supplies where large DC currents must be measured reliably over extended production runs.
Laboratory and industrial instruments and panel meters where interchangeable shunts allow a single ammeter to cover multiple current ranges.
DC power systems in data centres, substations, and distributed energy storage installations requiring continuous current supervision.
Industrial automation and process control equipment monitoring motor and actuator currents for efficiency and fault detection purposes.
Related Products of the SH-Fm Series High Amperage Shunt Resistors
Model: FL-2C100
Resistor type: Current Sensing
Description: High amperage shunt
Rated Current: 10A~100A
Supply Voltage: 75mV
Tolerance (%): ±0.5
TCR (ppm/C): 40 max.
Model: FL-2C750
Resistor type: Current Sensing
Description: High amperage shunt
Rated Current: 10A~750A
Supply Voltage: 75mV
Tolerance (%): ±0.5
TCR (ppm/C): 40 max.
Model: RSR
Resistor type: Current Sensing
Description: CE shunt
Rated Current: 10A~10,000A
Supply Voltage: 50mV, 75mV, 100mV
Tolerance (%): ±0.5, ±1, ±5
TCR (ppm/C): 30, 50, 100
Model: SH-L
Resistor type: Current sensing
Description: High amperage shunt
Rated Current: 1A~2500A
Resistance (Ω): 0.2m~16m
Tolerance (%): ±0.5, ±1, ±5
TCR (ppm/C): 50, 100
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.
