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TT Electronics WDBR-UL Series Ultra-Low-Profile Power Resistors

TT Electronics WDBR-UL Ultra-Low-Profile Power Resistors are perfect for dynamic braking, inrush limit, and snubber circuits. These resistors can handle up to 7kW of peak power, featuring a design with low inductance and high isolation, even after failsafe overload fusing. Their construction is RoHS-compliant and non-flammable, with a robust dielectric layer applied to a precision-machined stainless steel substrate. Thick-film conductor and resistor patterns are printed, fired, and shielded with a high-temperature overglaze. The termination pads come with tinned solder and the option for terminals or soldered-on leads. TT Electronics WDBR-UL Ultra-Low-Profile Power Resistors are suitable for single-fixing heatsink mounting, with the WDBR-UL series boasting UL 508 certification.

Features

5 size options
Low inductance
Overload power up to 13kW
Rated power up to 1.4kW
Range 12R to 150R
Robust thick-film on steel construction
UL508 certified - UL file E238661

Applications

Dynamic braking
Electronic assembly heater element
Inrush current limiting
Motor drive inverters
Over-voltage protection in wind turbines
Snubber

Technical Specifications

Parameters	Values
Resistance tolerance	10%
TCR	< +600 ppm/°C
Maximum element temperature	450°C
Ambient temperature range	-55°C to +200°C
Dielectric withstand	2500V (dc/ac peak)