Safe Braking Resistors

Safe brake resistors for electrical drive technology must meet specific requirements. High pulse loading capacity with controlled surface temperatures and a coherent safety concept under persistent overloads are required.

We have achieved optimum results with our wire-wound resistors to manage this balancing act. In compliance with the relevant standards, sub-components were selected and mounted in rugged, anodized aluminum housings using specific constructive measures.

Results speak for themselves: Low-inductance resistors that are particularly pulse resistant, with a specific safety concept to guarantee long life.

PTC denotes Positive Temperature Coefficient with special characteristics. The characteristics of a PTC resistor cause its resistance to exponentially increase from a defined temperature until it reaches high resistance. This property is used to provide advantages in various applications; in our equipment it is used as a brake resistor with the focus on the intrinsic safety of the components. When an integrated PTC is overloaded, the inverter signals an overvoltage on the DC link that can be compensated by an additional external resistor. Regarding the design the temperature and voltage dependencies of the PTC resistor must be taken into account.