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Crompton is a trademark of Crompton Parkinson Ltd. And is issued by TE Connectivity under licence.

Crompton Instruments


General Information:

Shunts are separately mounted units used for extending measurement of currents beyond the available limits of self contained DC Ammeters. The large capacity type switchboard shunts is designed for permanent installation in bus bar circuits. The lower capacity type is readily mounted on insulated or non-insulated panels. Where possible, all shunts should be mounted on the grounded side of the circuit. Panel mounted shunts with insulated bases must be mounted on the grounded side of the circuit above 750 volts.

Crompton Shunts are designed for use with standard 50 or 100 millivolt panel meters, switchboard indicating or recording instruments, calibrated in terms of the amperage rating of the shunts. The millivolt drop of the shunt is adjusted at the factory to within +/- 0.25% accuracy. For continuous operation, it is recommended that shunts are not run at more than two thirds (2/3) the rated current under normal conditions of use as per AIEEE standards.


Terminal blocks on the 50 and 100 millivolt shunts rated below 750 Amperes are made of brass. Shunts rated 750 Amperes and higher have terminal blocks constructed of large cross-sectional copper to allow adequate heat dissipation and provide sufficient rigidity to properly support the unit. The resistance blades are made of manganin shunt strip, having a negligible temperature co-efficient and thermoelectric effect, therefore avoiding error due to heating. Shunts may be connected (without error) in parallel, to measure heavy currents when each shunt has a separate pair of millivolt leads connected to the instrument terminals.

Special applications:

Special shunts for applications other than standard 50 or 100 millivolt drop, can be engineered and fashioned for your particular needs. A sketch of the required shunt showing its application is necessary to provide a prototype. If you need special shunt leads, ask us for them , and we will adjust them for you.

Shunts provide an accurate DC millivolt signal, exactly proportional to the system current, to drive ammeter indicator, overload protection and control devices. This range includes industrial, switchboard, DEF-66-13, DIN, base mounted, tag end, lightweight and panel meter shunts in a variety of formats and configurations with standard and non-standard industry outputs.