Description
The 3BHB006449R0002 (commercial designation MPS10/5-230/24/48) is an ABB industrial switch-mode power module engineered to deliver stabilized 24 V DC and 48 V DC rails from a single wide-range AC input. Designed for DIN-rail mounting in ABB Unitrol excitation panels, Advant/800xA DCS racks, and Symphony Plus enclosures, it consolidates what traditionally required two separate supplies into one convection-cooled, short-circuit-protected unit.
Application Scenarios
At a 350 MW coal-fired unit in Northern China, the Unitrol 1020 excitation cubicle originally carried two independent PSUs — one 24 V rail for the controller logic and relay coils, one 48 V rail for the field-bus repeaters and a small batch of 48 V annular-position sensors on the exciter fan skid. During a summer overhaul where the cubicle door was swapped for a louvered version to improve airflow, the maintenance team decided to reclaim panel width. They replaced both singles with a single 3BHB006449R0002 mounted on the top DIN rail. The dual-output nature meant 24 V and 48 V shared the 250 W envelope (roughly 120 W on 24 V for logic/relays + 100 W on 48 V for bus repeaters and sensors — well within the shared budget), and the 3BHB006449R0002‘s 85–264 V AC wide-input shrugged off the occasional 30 V sags when the plant’s auxiliary transformer switched taps. Two years post-retrofit, the excitation panel has logged zero PSU-related alarms, and the panel builder gained a free 72 mm width that was later filled by a spare I/O slice — a rare “win-win” in a retrofit.
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 3BHB006449R0002 (MPS10/5-230/24/48) |
| Manufacturer | ABB |
| Product Category | Switch-Mode Power Module (Dual Output) |
| Input Voltage | 85–264 V AC, 50/60 Hz (wide-range) |
| Output 1 | 24 V DC, up to 10.4 A (within shared budget) |
| Output 2 | 48 V DC, up to 5.2 A (within shared budget) |
| Total Output Power | 250 W (shared between both rails) |
| Efficiency | > 90 % (typical) |
| Cooling | Natural convection, fanless |
| Mounting | Standard 35 mm DIN rail |
| Operating Temp. | -10 °C to +60 °C |
| Protection Class | IP20 (cabinet install) |
| Dimensions (approx.) | 215 × 115 × 50 mm |
Technical Principles and Innovative Values
- Innovation Point 1: Shared-Budget Dual Rail in One Housing. Most DCS panels need 24 V for logic and 48 V for specific buses or legacy telephone-style annunciator loops. The 3BHB006449R0002 delivers both from a single AC feed — 24 V up to ~10 A and 48 V up to ~5 A, with the 250 W ceiling shared. That “shared budget” design lets engineers allocate power where the panel actually needs it, rather than sizing two fixed single-rail units.
- Innovation Point 2: Wide-Input + Galvanic Isolation for Generator Aux Buses. The 3BHB006449R0002 accepts anything from 85 V to 264 V AC single-phase — meaning it survives on diesel-gen aux buses that sag to 90 V during motor-start transients, and on 230 V mains during brownouts. Both outputs are galvanically isolated from the input and from each other, so a 48 V side short won’t collapse the 24 V logic rail feeding the controller CPU.
- Innovation Point 3: Fanless Industrial Grade for Vibration Zones. Many 250 W supplies rely on a 40 mm ball-bearing fan that dies inside a vibrating MCC or excitation cubicle within 3–5 years. The 3BHB006449R0002 is convection-only with potted magnetics and industrial-grade capacitors, rated -10 to +60 °C. In a Unitrol cubicle bolted to a generator pedestal, that fanless build is the difference between “fit-and-forget” and “replace PSU on every major outage.”
