Wirewound resistors are flameproof

TT Electronics has launched the WHS-UL high surge, UL-recognised, fusible resistor family. Developed for inrush control applications, such as power supplies, UPS, energy metering and motor drives, the resistors offer enhanced surge and pulse energy withstand capability.

TT Electronics’ engineering director, Brian Stephenson, said: “With TT’s new WHS-UL series, designers will find it possible to meet a range of surge requirements—either with a larger safety margin or in a smaller body size—due to its specially-designed, high-energy windings. At the same time, we are supporting our customers in the rapid achievement of their EMC and safety testing goals with this safety agency-accredited product.”

A UL1412-recognised fusible resistor, the WHS-UL provides failsafe fusing at 120/240Vrms with a UL94-V0 flameproof coating. Available in two, three and 5W sizes and at E24 values from 10 to 100ohms, these resistors offer up to 30J of surge energy capacity and up to 7kV peak 1.2/50µs performance. They also guarantee safe fusing in fault condition overloads from as low as 30W.