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Vishay unveils neutral ground resistors for industrial power systems

Posted: 30 Jan 2015     Print Version  Bookmark and Share

Keywords:Neutral ground resistors  industrial power system  Milwaukee Resistors NGR series 

Vishay Intertechnology, a manufacturer of discrete semiconductors and passive electronic components, introduces a new series of neutral ground resistors for industrial power systems. Using the company's GRE1 grid resistors mounted in weather-proof IP23-rated enclosures, Milwaukee Resistors NGR series devices combine line-neutral and system voltages with temperature performance of +760°C.

The NGR series resistors are designed to provide ground fault, over-voltage and short circuit protection for generators and transformers in wye (star) configurations without exceeding the temperature limitations outlined by IEEE-32. The devices offer line-neutral voltage from 1.39kV to 8kV, system voltage from 2.4kV to 13.8kV, and current ratings from 100A to 1000A. Resistance for the resistors ranges from 1.39Ω to 80Ω with tolerance of ±10 per cent.


The RoHS-compliant resistors offer a tied live design to eliminate floating voltages in the assembly and lifting eyes for safe and easy installations. Featuring a stainless steel element, ceramic insulators, and multiple taps, the NGR series provides reliability with a welded construction. Additionally, the devices' open design allows for maximum cooling efficiency. The units are offered in modular or custom designs.

Production quantities of the NGR series are available now, with lead times starting at five to six weeks.

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