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Power resistors feature flameproof construction, overload handling

Posted: 12 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:TT Electronics? IRC? wirewound? power? resistor?

TT electronics IRC Wire and Film Technologies Division has developed a series of power wirewound resistors with high-temperature ceramic shells and power ratings of up to 60W, providing design engineers with high-power flameproof resistive devices capable of handling overload conditions.

Designated the PW and PWR Series, the resistors are available in both axial and radial lead configurations. According to Keith Chipman, product manager at IRC's Wire and Film Technologies Division, the PW and PWR Series resistors are specifically designed for power applications and are excellent at handling overloads. "The resistors feature high-temperature ceramic shells with inorganic fill materials to create a flameproof construction," said Chipman.

Applications for the PW and PWR Series devices include power electronics circuits as inrush, pulse, or protection resistors; voltage dividers, bleeders, current limiters, and load banks. They are specified in power supplies, motor controllers, white goods and automotive applications.

The PW Series resistors, with power ratings from 2W to 25W in axial lead configurations and 20W to 60W in radial terminal configurations, are available in resistance values ranging from 0.10 ohm to 30 kilohms at standard tolerances of 110 percent or 15percent. TCRs range from 300ppm/0C to 5,500ppm/0C.

The PWR Series resistors are radial leaded (vertical) devices with power ratings from 3W to 10W, and resistance values ranging from 0.10 ohm to 18 kilohms, with standard tolerances of 110 percent or 15 percent.

The PW/PWR Series resistors are constructed using alloy resistance wire wound on fiberglass substrates, packaged in high-temperature ceramic shells with fireproof inorganic encapsulate material. PC board standoffs are optional on the PW Series devices.

IRC can produce devices outside these specifications to meet customer requirements. Typical pricing for the PW Series resistors ranges from 15cents to 20cents in quantities of 10,000. Pricing for the PWR Series is 43 cents in quantities of 10,000. Lead time for both devices is 4 to 6 weeks.




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