B&R X20MM4455
4x outputs (H bridge) with PWM control and 24 to 48 VDC ±25% supply 6 A nominal current (10 A max. current) 15 Hz to 50 kHz frequency, 16-bit PWM resolution, 15-bit + sign, minimum 10 ns Configurable dither 12 inputs 5 V, configurable for AB and ABR incremental encoders 2x 5 V encoder supply with up to 200 mA Source connection of digital inputs for encoder's open collector outputs 1-wire connections The PMW motor bridge module is used to control 4 DC motors with a nominal voltage of 24 to 48 VDC ±25% at a nominal current up to 6 A.
Lifecycle & replacement
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Technical specifications
Short description
| I/O module | 4-channel PWM motor bridge, 4 ABR incremental encoders |
General information
| Diagnostics / Module run/error | Yes, using LED status indicator and software |
| Diagnostics / Output | Yes, using LED status indicator and software |
| Diagnostics / Encoder power supply | Yes, using LED status indicator and software |
| Diagnostics / I/O power supply | Yes, using software |
| Power consumption / External I/O 50 kHz / 24 VDC | 3.3 W / channel |
| Power consumption / External I/O 50 kHz / 48 VDC | 4.7 W / channel |
| Power consumption / External I/O 50 kHz / 60 VDC | 5.4 W / channel |
| Power consumption / External I/O 10 kHz / 24 VDC | 2.1 W / channel |
| Power consumption / External I/O 10 kHz / 48 VDC | 2.4 W / channel |
| Power consumption / External I/O 10 kHz / 60 VDC | 2.6 W / channel |
| Power consumption / External I/O 5 kHz / 24 VDC | 2 W / channel |
| Power consumption / External I/O 5 kHz / 48 VDC | 2.1 W / channel |
| Power consumption / External I/O 5 kHz / 60 VDC | 2.2 W / channel |
| Power consumption / Bus | 0.01 W |
| Power consumption / Internal I/O | 2.4 W |
| Certifications / CE | Yes |
| Certifications / UKCA | Yes |
| Certifications / CRA (Cyber Resilience Act) | In preparation |
| Certifications / ATEX | Zone 2, II 3G Ex nA nC IIA T5 Gc IP20, Ta (see X20 user's manual) FTZÚ 09 ATEX 0083X |
| Certifications / UL | cURus E225616 Power conversion equipment |
| B&R ID code | 0xE8A4 |
| Status indicators | I/O function per channel, operating state, module status |
| Additional power dissipation caused by actuators (resistive) [W] | - |
Encoder power supply
| Quantity | 2 |
| Output voltage | 5 VDC |
| Output current | Max. 200 mA each |
| Short-circuit proof, overload protection | Yes |
Digital inputs
| Input filter / Hardware | <1 µs |
| Input filter / Software | - |
| Switching threshold / Low | <2 V |
| Switching threshold / High | >3 V |
| Quantity | 12 |
| Nominal voltage | 5 VDC, asymmetrical (single-ended) |
| Input circuit | Source |
| Connection type | 1-wire connections |
| Input resistance | Typ. 2.7 kΩ |
| Additional functions | 4x ABR incremental encoder |
| Insulation voltage between channel and bus | 500 Veff |
ABR incremental encoder
| Quantity | 4 |
| Encoder inputs | 5 VDC, asymmetrical (single-ended) |
| Counter size | 16-bit |
| Input frequency | Max. 100 kHz |
| Evaluation | 4x |
| Signal form | Square wave pulse |
PWM output
| Actuator power supply / Supply | External |
| Actuator power supply / Fuse | Required line fuse: Max. 32 A slow-blow (see "Overcurrent protection") |
| PWM pulse width / PWM mode | 15 bits plus sign ≥10 ns |
| PWM pulse width / Current mode | 15 bits plus sign ≥10 ns |
| Quantity | 4 |
| Nominal voltage | 24 to 48 VDC ±25% |
| Nominal current | 6 A |
| Maximum current | 10 A (2 s) |
| PWM frequency | 15 Hz to 50 kHz |
| Output protection | Thermal shutdown in the event of overcurrent or short circuit |
| Variant | H bridge |
| Configurable dither | Amplitude, frequency |
| Period duration resolution | 16-bit, min. 20 μs |
| Phase shift PWM1, 2, 3, 4 | 90° each |
| DC bus capacitance | 680 μF |
| Insulation voltage between channel and bus | 500 Veff |
Electrical properties
| Electrical isolation | Channel isolated from bus Channel not isolated from channel |
Operating conditions
| Mounting orientation / Horizontal | Yes |
| Installation elevation above sea level / 0 to 2000 m | No limitation |
| Installation elevation above sea level / >2000 m | Reduction of ambient temperature by 0.5°C per 100 m |
| Degree of protection per EN 60529 | IP20 |
Ambient conditions
| Temperature / Operation / Horizontal mounting orientation | 0 to 50°C |
| Temperature / Operation / Vertical mounting orientation | Not permitted |
| Temperature / Derating | - |
| Temperature / Storage | -25 to 70°C |
| Temperature / Transport | -25 to 70°C |
| Relative humidity / Operation | 5 to 95%, non-condensing |
| Relative humidity / Storage | 5 to 95%, non-condensing |
| Relative humidity / Transport | 5 to 95%, non-condensing |
Mechanical properties
| Note | Order 2x terminal block X20TB12 separately. Order 1x terminal block 0TB3103-7020 separately. |
| Pitch | 87.5⁺⁰.² mm |
Documentation & CAD
Files hosted by B&R Industrial Automation; links open the official download page.
Datasheets
Manuals
3D CAD models
ECAD / EPLAN
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.