Braking Resistors — Dissipating VFD Braking Energy
A braking resistor converts the motor kinetic energy into heat during deceleration or speed reduction. Without it, the DC bus voltage of the variable frequency drive rises to alarm level, triggering an OV (overvoltage) fault and emergency stop. Resistors are essential for lifting mechanisms, centrifuges, woodworking machines, and any system with frequent or intensive braking.
How to Select a Braking Resistor
Two key parameters: resistance (Ohm) and dissipation power (kW). Resistance must match the minimum value specified in the VFD manual. Power depends on the load kinetic energy and braking cycle frequency: for standard braking — 10-20% of VFD power, for intensive braking — 50-100%.
| Model | Dissipation Power | Resistance | Application |
|---|---|---|---|
| Bosch Rexroth R912004613 | 50 kW | 3.7 Ohm | Industrial lines, VFD 110 kW |
| Bosch Rexroth R912001651 | 12.5 kW | 22 Ohm | Lifting mechanisms, VFD 55 kW |
| Bosch Rexroth R912001655 | 1.56 kW | 70 Ohm | Conveyors, lifts, VFD 7.5 kW |
| Bosch Rexroth R912001653 | 1.04 kW | 90 Ohm | Machine tools, VFD 5.5 kW |
| Bosch Rexroth R912004564 | 0.1 kW | 190 Ohm | Small mechanisms, VFD 0.75 kW |
Braking Resistor Manufacturers
Our catalog features Bosch Rexroth braking resistors — from 0.1 to 80 kW dissipation power, for EFC3600, FE and FV series variable frequency drives. Aluminum housings with efficient heat dissipation, resistance range from 3.2 to 2,000 Ohm.
Related Categories
- Braking modules — external braking transistors (choppers) for VFDs without built-in module
- EMC filters — electromagnetic compatibility filters for VFDs
- All options — complete VFD accessories catalog
- Variable frequency drives — main equipment for which resistors are selected
Warranty and Delivery
Braking resistors come with official manufacturer warranty. Delivery across Ukraine — Kyiv, Kharkiv, Odesa, Dnipro, Lviv, and other cities.
