Buy Current Shunt Resistors

These current shunt resistors feature industry standard Manganin metal resistance elements for temperature stability. They provide four-wire "Kelvin" connections for accurate measurement of the shunt's voltage drop.

Learn more about current shunts...

See product specifications below. Please contact us regarding quantity orders for current shunts with other current and voltage ratings.

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B Series

500 Amp max. rated with 100 mV output.

model number: CSB500-100

3.25" L x 1.75" W x 1.75" H. Weighs 11 oz. Full mechanical dimensions (popup).

Has 3/8" dia. bolt power terminals. 0.205" diameter mounting holes.

    

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A Series

100 Amp max. rated with 100 mV output.

model number: CSA100-100

2.00" L x 1.25" W x 1.68" H. Weighs 3 oz. Full mechanical dimensions (popup).

Has 1/4" dia. bolt power terminals. 0.205" diameter mounting holes.

    

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Current Shunt Resistor Specifications

All our current shunts are calibrated to ± 0.25% accuracy at room temperature (20 °C, 68 °F).

Temperature drift of the measured voltage is typically 0.002% per °C (1.8°F).

They are manufactured to meet GSA federal CID-A-A-55524 specifications which supersedes military specification: MILS161B.

Note that for continuous operation in room temperature freely circulating air, the shunt should be operated at only 66% (2/3) of the "rated current". E.g. a 500 Amp shunt is good for 333 Amps continuously.

You should keep the shunt's operating temperature below 145°C to prevent permanent change to its resistance. 90 °C (194° F) on the resistive strips is a good operating maximum to stay withing specification.

Shunts have a phenolic base with two holes for mounting screws. Terminal blocks are solid brass.

The large bolts are for the high-current carrying ohmic) connection. These are where you connect your current carrying wires. The small screws are for the shunt voltage (kelvin) measurement connection. These wires carry very small current and are used to measure the voltage drop across the shunt. Very small voltages are involved, so you don't want any unecessary IR drop effecting your readings. This is why the kelvin connections are usually placed closer to the shunt element than the ohmic connections.