Product Description:

The 18.BR.226-6203 braking resistor is produced by KEB as part of the BR Braking Resistors series. This component is installed across the DC link of a drive controller to convert regenerative motor energy into heat and prevent overvoltage when an axis decelerates. By providing a stable resistance path, the unit helps maintain bus stability in conveyors, hoists, and other inverter-controlled machinery. It is especially useful on applications with frequent stopping, reversing, or lowering loads that return energy to the inverter.

The resistor has a continuous rating of 1700 W, meaning it can dissipate that power continuously when airflow and mounting guidelines are followed. For short dynamic stops, it can handle a peak load of 34 kW with a duty cycle of 5 % within a 120-second window, allowing aggressive braking without excessive temperature rise. Its resistance is 20 Ω, which sets the current drawn from a 400 V DC link and influences the available braking effect. Matching the resistor value to the DC link helps keep braking current within the intended operating range of the chopper circuit. An aluminum profile 119.5 mm high carries heat away from the element, and fixing slots sized Ø6.5 × 10 mm help speed installation on a cabinet back panel.

The enclosure has a protection rating of IP20, which helps prevent finger contact while still allowing natural convection. A thermostatic NC contact responds at 240 °C; when that threshold is reached, the contact opens to interrupt the brake chopper circuit or signal a fault. This arrangement provides a simple overtemperature signal for the control circuit without requiring a separate sensor. The contact can switch up to 250 VAC at 3 A or 30 VDC at 3 A, which suits common control relays. The overall length is 625 mm and the overall height is 270 mm, allowing horizontal mounting above drives when clearance is maintained.