Current Sensing Resistors

An industry-leading array of shunt and low-resistance components across 8 sub-categories — from AEC-Q200 automotive chip shunts and milliohm precision types to high-amperage panel shunts rated up to 12,000A for utility and industrial power metering.

±0.05%
Tightest Tolerance

A current sensing resistor — also called a shunt resistor — is a precision low-resistance component inserted in series with a load to measure current flow. By measuring the small voltage drop across the shunt using Ohm's Law (V = I × R), the current through the circuit can be accurately determined without interrupting the load path. The fundamental requirements for a good current sense resistor are very low resistance (to minimize power loss and voltage drop), tight tolerance (for measurement accuracy), and low TCR (so the resistance — and therefore the measurement — stays stable as the component heats up under load).

RARA offers an industry-leading 8 sub-categories of current sensing resistors: AEC-Q200 automotive-qualified shunts, low resistance metal alloy and metal foil types, chip SMD current sense resistors, precision four-terminal Kelvin-connected types, through hole variants, high power shunts up to 250W, power metering shunts, and high amperage panel shunts rated up to 12,000A.

At the precision end, RARA's HPS, UHPS, and PSS high-power precision shunts achieve ±0.05% tolerance and TCR as low as 3 ppm/°C — critical for accurate energy metering and battery coulomb counting in EV systems. At the high-amperage end, the RSR and SH-T panel shunts handle up to 12,000A at 50–100mV drop for utility metering and industrial current measurement.

With eight current sensing sub-categories, RARA offers the broadest range of current sensing resistors available from a single ISO-certified supplier — from AEC-Q200 chip shunts to 12,000A panel shunts.