Riedon is expanding its extensive line of high-power wirewound resistors, with a new series of rugged metal-clad braking resistors that deliver high levels of performance and a reduction in the need for heatsinking.

The devices target a range of industrial and other commercial applications including motor drives, power conversion systems, HVAC systems and battery charging and monitoring applications.

Encased in aluminum, the new BR series offers power ratings from 60 to 500W and is available in three different mechanical constructions. Highly durable and rugged components, they provide improved heat transfer and short-circuit performance. They are also significantly less sensitive to heatsink requirements than a comparable TO-packaged device of a similar power rating, many of which may require a cold plate to operate at the same rated power.

The BR series’ high level of performance is largely due to the use of ceramic cores rather than fiberglass: ceramic delivers benefits over fiberglass in efficiency by dealing with heat more effectively with overload and current surge events. Although ceramic is traditionally a more expensive solution, the new series is highly competitive, thereby delivering an excellent performance/price option for industrial power designers and engineers.

Available in flat (BR) or tall (BRT) series versions, other features include: a resistance range from 0.1O to 1kO; tolerances of 1%, 5% and 10%, making the series suitable for a range of applications; a withstand voltage of 2500V AC; good long-term stability with a TCR of less than ±260ppm maximum; quick-connect terminations; and an operating temperature range from –55 to +200°C.

In addition, the BRS series is now available, which is an ultra-slim 12mm-high profile variant that offers power ratings from 100 to 500 watts and a resistance range from 1O to 5kO.


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