RSN Series – Riedon™ DC Ammeter Shunts / Busbar Shunts by Bourns

Shunt FAQs (continued)

Question: Do you offer customization services for your

shunts?

Answer: Absolutely! We have helped design and have

manufactured a number of application specific models for use

in everything from electric vehicles to aerospace. We welcome

both customer specific drawings as well as modifications to our

standard shunts.

Question: What are the recommended wiring guidelines for

your current sensing shunts?

Answer: Shunts should be wired into the circuit to be monitored

in the ground or return line as close as practical to the power

source. This will limit the voltage differential between the

terminals of the shunt and ground, thus providing a degree of

safety against electrical shock. In addition, placing the shunt

near the power source will ensure that all of the loads are

accounted for.

Question: Is ±0.25 % the best tolerance you offer for your

shunts?

Answer: ±0.25 % is our standard tolerance, however, a large

portion of our shunts are available with tolerances as tight as

±0.1 %. Please send us an inquiry and we will confirm availability

of the tighter tolerance.

Question: What is the TCR (temperature coefficient of

resistance) of your shunts?

Answer: Our shunts utilize a manganin resistive element

that features a very stable TCR of 15 ppm to 20 ppm in a

temperature range of 30 °C to 60 °C.

Question: How do I help to limit the temperature rise of a

shunt?

Answer: Above 100 amps, a vast majority of the heat generated

by a shunt is dissipated into the current carrying bus bars

or wires. In addition, it will help to mount the shunt in such a

way that the resistive elements are vertical. Finally, it can be

beneficial to have adequate air flow around the shunt to help

remove excess heat.

Question: Do you offer crosses to Empro Shunts?

Answer: Yes, we have direct replacements for the following

Empro series: HA, MLA, MLB, MLC, Type A, Type B, and Type

E. We may be able to offer other alternatives of Empro Shunts

as well, please send us an inquiry.

Question: Do you offer crosses to Canadian Shunts?

Answer: Yes, we have direct replacements for the following

Canadian Shunt series: Type A, Type C, Type G, Type H, Type

LA, Type LB, Type LC, and Type V. These Canadian Shunts can

be customized to your specific needs to offer other alternatives

as well, please send us an inquiry.

Question: What resistance material do you use for your

shunts?

Answer: We utilize a material called Manganin. Manganin

is a precision resistance alloy, with moderate resistivity, low

temperature coefficient of resistance and low thermal EMF

versus Copper. With high stability of electrical resistance,

good working properties and very good weldability, Manganin

is specially dedicated to precision resistors, electrical shunts

which control and measure the current through devices such as

electricity meters or DC ammeters.

Specifications are subject to change without notice.

Users should verify actual device performance in their specific applications.

The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.