B&R 8B0W0045H000.000-1
8B0W external braking resistors can be used to dissipate braking energy with B&R drive systems. Compact design High peak load capacity Intrinsically safe IP20 protection Optimally suited for B&R drive systems Braking resistor, 450 W, 50 R, IP20, terminals
Lifecycle & replacement
No manufacturer-published lifecycle data for B&R part numbers is indexed here yet. Ask IAC to check availability and an upgrade path.
IAC stocks legacy spares and exchange units and quotes upgrade paths. Send us the nameplate details and we will confirm a compatible replacement.
Technical specifications
General information
| Certifications / CE | Yes |
| Certifications / UKCA | Yes |
| Certifications / CRA (Cyber Resilience Act) | Not applicable |
| Certifications / UL | UL E208678 Power circuit and motor-mounted apparatus - Component |
| Certifications / KC | Yes |
| RoHS-compliant | Yes |
| Cooling and mounting type | Wall mounting |
Motor holding brake connection
| Terminal connection cross section / Flexible and fine-stranded wires / With wire end sleeve | 1.5 to 10 mm² |
| Terminal connection cross section / Approbation data / UL/C-UL-US | 24 to 6 AWG |
| Terminal connection cross section / Approbation data / CSA | 22 to 6 AWG |
Braking resistor
| Continuous power depending on mounting orientation / Standing horizontally | 388 W |
| Continuous power depending on mounting orientation / Hanging vertically | 424 W |
| Variant / RB1, RB2 | Terminals with tension spring technology |
| Variant / PE | M5 threaded bolt |
| Variant / Shield connection | Yes, on the connection box via high-strength cable gland |
| Reduction of continuous power depending on ambient temperature | 7.5 W/K (starting at 40°C) |
| Ohmic resistance | 50 Ω ±10% |
| Max. operating voltage | 850 VDC |
| Insulation voltage type test | 4,000 VAC |
| Intrinsically safe | Yes (for operating voltages ≥500 VDC) |
| Terminal cable outer cross section dimension of attachment cable | 9 to 16.6 mm |
Temperature model data
| Thermal resistance between braking resistor and environment depending on mounting orientation / Standing horizontally | 1.657 K/W |
| Thermal resistance between braking resistor and environment depending on mounting orientation / Hanging vertically | 1.517 K/W |
| Thermal capacity | 30.88 Ws/K |
| Max. permissible overtemperature | 683°C |
Operating conditions
| Permissible mounting orientations / Hanging vertically / Connection box, bottom | Yes |
| Permissible mounting orientations / Hanging vertically / Connection box, top | No |
| Permissible mounting orientations / Standing horizontally | Yes |
| Degree of protection per EN 60529 / Hanging vertically / Connection box, bottom | IP21 |
| Degree of protection per EN 60529 / Hanging vertically / Connection box, top | - |
| Degree of protection per EN 60529 / Standing horizontally | IP20 |
Ambient conditions
| Temperature / Operation | -40 to 90°C |
| Relative humidity / Operation | 5 to 95% |
Mechanical properties
| Dimensions / Width | 124 mm |
| Dimensions / Height | 121 mm |
| Dimensions / Depth | 403 mm |
| Weight | 2.4 kg |
Documentation & CAD
Files hosted by B&R Industrial Automation; links open the official download page.
Datasheets
Manuals
3D CAD models
Get a quote for a replacement
Industrial Automation Co. stocks, sources, and repairs B&R parts — new, refurbished, or exchange units with warranty.
Specifications from the official B&R product catalog. Always confirm against the datasheet for your exact revision.