Resistor enables fusing 'without a bang'
Designed for electric appliances, energy meters, and power supplies, the Vishay Draloric AC05..CS is a 5W axial silicone cemented, fusible wirewound safety resistor. It is claimed by Vishay to be the industry's first resistor designed to ensure safe and silent fusing operation during overload conditions, while offering surge voltage withstanding capability up to 6kV (1.2 µs / 50 µs).
The resistor combines a fusing time of < 45 s for a 100W overload, with a special non-flammable silicone cement coating for immediate interruption without flame and explosion when AC mains voltage (230 VAC) is applied. The resistor provides a power rating of 5W at an ambient temperature of 40°C, and 4.5W at 70°C. The RoHS-compliant device offers resistance from 10Ω to 100Ω, resistance tolerance of ± 5 %, and TCR of ± 200 ppm/K.
UL1412 safety approval for the AC05..CS has been initiated and is expected by February 2014. In addition to fusing "without a bang," the safety resistor acts as an inrush current limiting resistor during normal operation. The device's specially developed non-flammable silicone cement lacquer coating allows designers to meet safety requirements more easily, while eliminating the need to utilize additional fuses in series with the input resistor.
The safety resistor is available now, with lead times of eight to 10 weeks.
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