Passives

COTS resistors feature 2500W high power rating

17th June 2015
Mick Elliott

An expanded range of precision foil current sense resistors offering five new SHR series devices are now available in the UK from Charcroft Electronics. Offered in a wide range of anodised aluminum package sizes, the Powertron made-in-Germany SHR 4-8065, SHR 4-80110, SHR 4-80216, SHR 4-80320, and SHR 4-80370 combine a low TCR of ±2ppm/K with extremely high power ratings to 2500W.

Offering load stability to 0.1% for up to 1,000 hours, the RoHS-compliant SHR 4-8065, SHR 4-80110, SHR 4-80216, SHR 4-80320, and SHR 4-80370 provide highly accurate and reliable current sensing in industrial power supplies, digital multimeters, current control systems, medical equipment, solar and wind inverters, and AC/DC converters, as well as systems such as battery chargers and test equipment for electric cars.

The resistors released today offer a wide range of power ratings — from 24W in free air to 2500W when mounted on a heatsink — with low resistance values from 0.005 Ω to 300Ω and tight tolerances to ±0.1%.

The devices feature maximum currents to 60A (with higher values and currents available upon request), very low inductance of <50nh, thermal EMF of <1 µV/°C, and a temperature range of -40°C to +130°C.

"The choice of a precision resistor can have far-reaching effects on system performance," said Kai Karstensen, managing director of Powertron. "It's a decision that often requires a high level of expertise and support, and Charcroft has a long history in the EU electronics industry of providing just that. They are the perfect partner for projects that demand stability, reliability, and precision."

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