RS Components adds Isabellenhütte precision power resistors

High-end current-sense devices optimise power use on PCBs
in EV and automotive applications

LONDON, UK, 11 February 2020 – RS Components (RS) (, the trading brand of Electrocomponents plc (LSE: ECM), a global multi-channel provider of industrial and electronic products and solutions, has introduced the Isabellenhütte portfolio of high-precision, low-ohmic current-sense resistors. Produced using two different proprietary manufacturing technologies known as ISA-Plan and ISA-Weld, Isabellenhütte’s current-sense resistors meet stringent criteria with regard to thermoelectric voltage, long-term stability and inductance that allow electronics designers to optimise power use on PCBs more efficiently than otherwise possible.

Isabellenhütte is one of the world’s leading suppliers of high-quality low-ohmic power resistors. RS is the first high-service-level distributor to offer Isabellenhütte products, including over 200 SMD power resistor specifications.

Isabellenhütte power resistors are widely used in automotive ( such as battery management in electric, hybrid and conventional vehicles, ABS (anti-lock braking systems), ASR (anti-slip regulation), cruise control, power steering, fuel injection and traction control systems. They are also found in power supplies, as shunts for energy meters and IGBT (insulated-gate bipolar transistor) power modules, and in various industrial, telecommunications and consumer applications.

In ISA-Plan devices, highly precise resistor elements are etched onto a homogenous film of one of Isabellenhütte’s resistance alloys — either Manganin or Zeranin — which exhibit a very low temperature coefficient of resistance (TCR). They are electrically insulated, mounted on a metal substrate with good thermal conductivity, and packaged as small SMDs. The resistor material is thermoelectrically well matched to copper, reducing thermoelectric voltage to virtually zero. Heat conduction into the substrate permits excellent pulse power ratings. ISA-Plan resistors are available with resistance values from 1mΩ to 4.7Ω, tolerances of 0.5%, 1% or 5%, power ratings from 0.5W to 7W, and TCR down to 20ppm/°C.

ISA-Weld power resistors consist of an electron-beam-welded composite of copper and a resistance alloy: Manganin, Zeranin, Noventin, ISAOHM or Aluchrom. These materials are flexible enough to be adapted to a range of geometries and applications and offer uniform current density and heat distribution within the resistor. ISA-Weld resistors offer resistance values from 0.1mΩ to 6.8mΩ, tolerances of 1% or 5%, power ratings up to 15W, and TCR down to 20ppm/°C.

The Isabellenhütte portfolio of high-precision, low-ohmic current-sense resistors is shipping now from RS in the EMEA and Asia Pacific regions.


About RS Components
RS Components is a trading brand of Electrocomponents plc. We offer more than 500,000 industrial and electronic products, sourced from over 2,500 leading suppliers, and provide a wide range of value-added services to over one million customers. With operations in 32 countries, we ship more than 50,000 parcels a day.

We support customers across the product life cycle, whether via innovation and technical support at the design phase, improving time to market and productivity at the build phase, or reducing purchasing costs and optimising inventory in the maintenance phase. We offer our customers tailored product and service propositions that are essential for the successful operation of their businesses and help them save time and money.

Electrocomponents is listed on the London Stock Exchange and in the last financial year ended 31 March 2019 reported revenue of £1.88 billion. Electrocomponents has seven operating brands: RS Components, Allied Electronics & Automation, RS PRO, OKdo, DesignSpark, IESA and Monition.

For more information on RS, please visit the website at

Editorial Contact:
Aakriti Kaushik
PR Manager – Northern Europe
RS Components
+44 (0) 7795 400651

PR Agency Contact:
Janice Fenton
Account Director
Publitek Technology PR
+44 (0) 1225 470000

Further information is available via these links:
Twitter: @RSComponents; @designsparkRS

RS Components
Electrocomponents plc

Manganin, Zeranin, Noventin, ISAOHM, ISA-Weld and ISA-Plan are protected trademarks of Isabellenhütte