Description
The 1MRK002246-BC is an internal Switch-Mode Power Supply Board (PCBA) manufactured by ABB, designed to convert wide-range AC mains or DC input into regulated low-voltage DC outputs (typically +5 V DC, +24 V DC, and auxiliary voltages) for the internal electronics of ABB protection relays (REF/RET/REL series), bay controllers, and DCS extension chassis. It mounts inside the IED or control unit backplane and provides clean, isolated power to CPUs, I/O boards, communication cards, and display units.
Application Scenarios
Imagine a 400 kV substation where an ABB RET670 transformer-protection bay suddenly logs an “Internal 5V Failure” and refuses to go In-Service after a breaker maintenance test. The protection elements and I/O boards are intact—only the internal power supply PCB has failed due to aged electrolytic capacitors after 20 years of continuous operation. Replacing the entire IED would mean re-terminating CT/VT secondaries, reloading settings, and a multi-day requalification. Instead, the protection engineer powers down the bay, removes the cover, extracts the failed 1MRK002246-BC from its backplane slot / chassis mount, installs a verified replacement matching the BC revision, and restores power. The IED passes all self-tests, the protection scheme re-arms, and the bay returns to service in under 45 minutes. The 1MRK002246-BC directly solves the legacy-spares crisis for utilities and process plants extending the certified life of proven ABB protection and automation assets—turning a potential bay outage and capital expense into a routine board-level swap.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1MRK002246-BC (Alt. Ref: 1MRK002246BC) |
| Manufacturer | ABB |
| Product Category | Internal Switch-Mode Power Supply Circuit Board (SMPS PCBA) |
| Associated Equipment | ABB REF615, RET670, REL560/670, REX610 IED chassis; Advant/DCS extension control units |
| Input Voltage | 85–264 V AC (Universal Wide Range) or 88–300 V DC (depending on IED chassis variant) |
| Output Voltages | +5 V DC (logic), +24 V DC (internal aux / I/O excitation), ±12 V DC (optional comms) |
| Output Power (Typical) | 30–80 W total (variant-dependent; matches host IED power budget) |
| Efficiency | ≥ 85–90 % (High-frequency switch-mode topology) |
| Isolation / Safety | Reinforced insulation Primary ↔ Secondary; meets IEC 60950-1 / EN 61010-1 |
| Protection Features | Input inrush limiting, short-circuit protection (fold-back), overload, overvoltage crowbar |
| PCB Construction | Industrial-grade FR-4 multilayer with through-hole power components, heat-sinked MOSFETs |
| Cooling | Convection cooled via chassis airflow; thermal shutdown protection |
| Operating Temp. | -20 °C to +60 °C (extended-range versions -40 °C to +70 °C) |
| Mounting | Chassis-slot edge connector and/or screw-fastened into IED / control unit power bay |
| Indicators | Optional on-board LED for “DC OK” / Output Healthy (present on later revisions) |
| Weight (Approx.) | 0.35–0.50 kg |
Technical Principles and Innovative Values
- Innovation Point 1 — Wide-Range Universal AC/DC Input with Inrush Limiting: The 1MRK002246-BC accepts 85–264 V AC without manual voltage selection and also supports DC battery backing (88–300 V DC on applicable variants). A built-in NTC inrush limiter protects upstream fuses during power-up, making the same board usable globally and tolerant of weak or fluctuating site supplies—critical for substations with diesel-generator transition modes.
- Innovation Point 2 — Low-Noise Regulated Outputs for Sensitive IED Logic: Unlike generic open-frame supplies, the 1MRK002246-BC is tuned for low output ripple (<50 mV p-p typical) and tight regulation (±1 %) on the 5 V logic rail, ensuring reliable operation of high-speed A/D converters, CPUs, and HSR/PRP communication modules in the same chassis—preventing subtle data corruption that noisy supplies can cause.
- Innovation Point 3 — Exact Form-Factor & Connector Match for Direct Swap: The board uses the identical mechanical footprint, mounting holes, and backplane/mating connector layout as the original ABB-supplied power PCB. Technicians remove the failed unit and install the 1MRK002246-BC without adapter harnesses, drilling, or re-termination of field power—minimizing MTTR to a single maintenance-window task.
