New resistor series offer superior reliability and enhanced product safety

21-04-2022 | TT Electronics | Passives

TT Electronics now offers its high surge, UL-recognised, fusible resistor family – the WHS-UL Series. Designed for inrush control applications, including power supplies, energy metering, UPS, and motor drives, its new resistors provide enhanced surge and pulse energy withstand capability.


“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,” said Brian Stephenson, engineering director, TT Electronics. “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 (UL file E234469), the series offers failsafe fusing at 120/240Vrms with a UL94-V0 flameproof coating. Available in 2W, 3W and 5W sizes and at E24 values from 10-Ohm to 100-Ohm, these resistors provide 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 30W. The series is offered in various lead preforms, including vertical radial form in tape and ZI form for SMD processing.

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