Thin UL-approved Power Resistors For Space-saving Designs

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power resistor
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Ultra-low profile high power resistors from TT Electronics are UL recognized

For circuit designers who need to design UL approved systems containing power resistors in highly compact enclosed assemblies with heatsink-based thermal management, TT Electronics’ WDBR-UL series provides a far lower volume solution than competing encased wirewound products and a faster route to safety certification, the company says.

With nine values from 12R to 150R in five size options, the WDBR-UL series’ creepage, clearances and power ratings have been assessed in accordance with the requirements of UL508, easing the compliance burden for UL approved end users.

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Typical applications include motor drive inverters, dynamic braking, inrush current limiting, snubber circuits, electronic assembly heater elements, and over-voltage protection in wind turbines.

“Versatile, the UL approved resistors are available in nine values from 12R to 150R in five size options and their ultra-low profile design offers a ‘stand height’ thickness of less than 2mm – very desirable for use in modern, compact designs where traditional, bulky wirewound solutions would be unsuitable”, the company noted in the announcement.

The power resistors claim to offer high isolation from a heatsink even after failsafe overload fusing and feature a very low inductance design.

They are available in continuous power ratings up to 1.4kW with up to 7kW continuous peak power dissipation, and they are able to handle single overload power levels up to 13kW.

Offering ease of fitment, they are single fixing heatsink mountable resistors and offer a choice of flying lead or solder terminations.

The resistors’ non-flammable, innovative construction comprises a high integrity dielectric layer that is applied to a machined stainless steel substrate.

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The thick-film conductor and resistor patterns are printed and fired, then protected with a high-temperature overglaze. The termination pads are tinned with solder and the optional leads are soldered on.

WDBR-UL Series power resistors features:

  • Ultra low profile thick-film on steel
  • Up to 7kW peak power
  • Single fixing heatsink mountable
  • Ideal for dynamic braking, inrush limit and snubber circuits
  • Choice of flying lead or solder terminations
  • Low inductance design
  • High isolation, even after failsafe overload fusing
  • RoHS compliant, non-flammable construction
  • UL508 certified – UL file E238661

For the WDBR-UL datasheet, click here. For more information click here. 

 

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