Product Description:

The 15.56.080-4008 is a braking resistor element produced by KEB as part of the BR Braking Resistors series. Designed for integration with frequency inverters and other DC-bus drives, the unit converts excess kinetic energy from a decelerating motor into heat so the drive’s DC link voltage remains within safe limits. By providing a controlled path for regenerated current, the component prevents over-voltage trips in conveyors, hoists, and other automated machinery that experience frequent speed changes.

Electrical performance is anchored by a resistance of 56 Ohm, a value that determines the magnitude of current that flows when the resistor is switched across the DC link. Because thermal loading rises with duty cycle, KEB lists three continuous dissipation figures: at 25 % duty the device handles 3700 W, at 40 % duty it withstands 5500 W, and with only a 6 % duty window the rating is 1200 W. These intervals allow designers to match braking profiles to the thermal mass of the element without exceeding its surface temperature limit. For very short events such as emergency stops, the assembly tolerates a momentary absorption of 10.3 kW, giving additional headroom when a large inertial load must be arrested quickly.

Compatibility with inverter families up to 400 V DC is ensured by the internal insulation spacing and creepage distances. Connection is made through terminals PA and PB, simplifying parallel wiring with the drive’s bus bars while maintaining low loop inductance. An External mounting style keeps the heat-generating body outside the enclosure, which reduces cabinet temperature and preserves electronics lifespan. The design is validated by KEB to operate within the duty-based power limits outlined above, allowing system integrators to finalize braking modules without additional thermal testing.