A high surge, UL-recognized, fusible resistor family has been developed by TT Electronics for inrush control applications, such as power supplies, uninterruptible power supplies, energy metering and motor drives. The WHS-UL resistor series offers enhanced surge and pulse energy withstand capability.
A UL1412-recognized fusible resistor (UL file E234469), the WHS-UL provides failsafe fusing at 120/240 V rms with a UL94-V0 flameproof coating. Available in 2 W, 3 W and 5 W sizes and at E24 values from 10 to 100
Source: TT Electronics ohms, these resistors offer up to 30 J of surge energy capacity and as much as 7 kV peak 1.2/50 µs performance. They also guarantee safe fusing in fault condition overloads from as low as 30 W. The WHS-UL is available in a wide range of lead preforms, including vertical radial form in tape and ZI form for SMD processing.
“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.”
