B&R 8WSB43.ee012jjKop0
Synchronous motor 8WSB43 with direct gearbox mounting, SSI encoder, single-turn, gear ratio = 12.25, keyed shaft end, IP66/67, nominal speed: 4900 rpm, fixed attachment cable 0.5 m with hybrid connector
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 | cURus E235396 Servo and stepper motors - Component |
Motor
| Nominal speed nN [rpm] | 4900 |
| Number of pole pairs | 4 |
| Nominal torque Mn [Nm] | 0.204 |
| Nominal current IN [A] | 2.5 |
| Stall torque M0 [Nm] | 0.253 |
| Stall current I0 [A] | 3.1 |
| Maximum torque Mmax [Nm] | 0.65 |
| Maximum current Imax [A] | 8.4 |
| Maximum speed nmax [rpm] | 6980 |
| Torque constant KT [Nm/A] | 0.095 |
| Voltage constant KE [V/1000 rpm] | 6.07 |
| Stator resistance R2ph [Ω] | 0.72 |
| Stator inductance L2ph [mH] | 1.34 |
| Electrical time constant tel [ms] | 1.87 |
| Thermal time constant ttherm [min] | 11.3 |
| Moment of inertia J [kgcm²] | 0.049 |
| Weight without brake m [kg] | 0.64 |
Gearbox
| Number of gear stages | 2 |
| Gear ratio i | 12.25 |
| Max. drive speed n1max [rpm] | 8000 |
| Max. backlash Jt [arcmin] | 35 |
| Torsional rigidity Ct21 [Nm/arcmin] | 0.4 |
| Efficiency at full load ŋ [%] | 90 |
| Weight m [kg] | 0.31 |
Recommendations
| ACOPOSmicro 80VD100Px.xxxx-01 | C03X, C033 |
Documentation & CAD
Files hosted by B&R Industrial Automation; links open the official download page.
Manuals
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.