High precision current sense resistors help upgrade systems

13th October 2016

Alice Matthews

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VPG Foil Resistors has announced that its Powertron brand has expanded its S-Line of precision Bulk Metal Foil current sense resistors with the new SHLR series. For industrial and energy applications, the SHLR 4-2321, SHLR 4-3825, and SHLR 4-3825H are the industry's first such devices to combine low resistance down to 0.001Ω, TCR to ±2ppm/K, and high power ratings up to 50W.

Offering load stability to 0.1% for up to 2,000 hours, the resistors released today provide highly accurate and reliable current measurement in industrial instrumentation and battery management systems, as well as smart energy grids and solar and wind inverters. For these applications, the devices feature a wide range of power ratings — from 3W in free air to 50W when mounted on a heatsink — and resistance values from 0.001Ω to 0.005Ω with tight tolerances to ±0.1%.

The SHLR series achieves its very low TCR in the standard working range of 20 to 60°C thanks to bulk metal foil technology based on CuMnSn metal foil. Its nearly flat TCR curve will help engineers to design more precise equipment or to upgrade existing systems.

SHLR series resistors feature maximum currents to 150A, very low inductance, thermal EMF of <1 μV/K, thermal resistance down to 1.6K/W, and an operating temperature range of -40°C to 130°C. Offered in anodised aluminium packages, the devices are RoHS-compliant and lead (Pb) free.

Part number		SHLR 4-2321	SHLR 4-3825	SHLR 4-3825H
Resistance range (Ω)		0.001 to 0.005
Power rating (W)	Free air 70 °C	3	3	5
Power rating (W)	With heatsink	40	50	50
Thermal resistance (K/W)		2.0	1.6	1.6
Voltage proof (VDC)		300	500	500