Application Scenarios
Imagine a 400 kV substation where an ABB RET670 transformer protection bay suddenly logs an “Internal 5V Failure” after a routine maintenance test. The protection elements are intact, but the IED refuses to go In-Service—a classic symptom of aged electrolytic capacitors on the internal power board after 15+ years of continuous operation . Replacing the entire IED would mean re-terminating CT/VT secondaries, reloading complex protection settings, and a multi-day requalification process. Instead, the protection engineer powers down the bay, opens the cover, extracts the failed ABB 1MRK002246-BC from its chassis slot, and installs a verified replacement . On power-up, the IED passes all self-diagnostics and returns to service in under 45 minutes. This is the real value of the ABB 1MRK002246-BC—it transforms a potential bay outage and capital expense into a routine, low-cost board swap that keeps legacy protection assets operating with certified reliability.
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | ABB 1MRK002246-BC (Alt: 1MRK002246BC) |
| Manufacturer | ABB (Sweden / Switzerland) |
| Product Category | Internal Switch-Mode Power Supply Board (SMPS PCBA) |
| Input Voltage (AC variant) | 85–264 V AC (universal) or 88–300 V DC |
| Input Voltage (DC variant) | 18–36 V DC (typical 24V DC control supply) |
| Output Voltages | +5 V DC (logic), +24 V DC (I/O), ±12 V DC (comms) |
| Output Power (Typical) | 30–80 W total |
| Efficiency | ≥85–90% (high-frequency switch-mode) |
| Protection Features | Input reverse polarity, short-circuit fold-back, overcurrent, overvoltage crowbar, thermal shutdown |
| Operating Temperature | -20°C to +60°C (extended variants -40°C to +70°C) |
| Dimensions (Reference) | Approx. 140 × 60 × 20 mm to 232 × 172 × 16 mm (variant dependent) |
| Weight | Approx. 0.15–0.50 kg |
| Certifications | CE, UL, cUL |
Technical Principles and Innovative Values
Innovation Point 1: Exact Form-Factor Legacy Compatibility
The ABB 1MRK002246-BC uses the identical mechanical footprint, mounting hole pattern, and edge connector layout as the original ABB power PCB. This means technicians can replace the failed unit without adapter harnesses, drilling modifications, or re-termination of field power cables. The board is engineered for a drop-in fit inside RELION series IEDs and ABB bay control chassis, minimizing Mean Time To Repair (MTTR) to a single maintenance-window task .
Innovation Point 2: Wide-Range Universal Input with Inrush Limiting
Unlike many industrial power supplies, the ABB 1MRK002246-BC accepts an exceptionally broad input range—85–264V AC without manual voltage selection—and also supports DC battery backing at 88–300V DC on applicable variants . An integrated NTC inrush limiter protects upstream fuses and circuit breakers during power-up, making the board globally deployable and tolerant of weak or fluctuating site supplies. This flexibility is critical for substations with diesel-generator transition modes and for plants with unstable utility power.
Innovation Point 3: Low-Noise Outputs for Sensitive Protection Logic
Generic open-frame power supplies often introduce ripple and noise that can corrupt high-speed A/D converters, HSR/PRP communication modules, and microprocessors. The ABB 1MRK002246-BC is specifically tuned for low output ripple (typically <50 mV peak-to-peak) and tight regulation (±1%) on the +5V logic rail . This ensures reliable operation of critical protection algorithms and prevents subtle data corruption that could delay fault detection or cause nuisance trips.
Innovation Point 4: Comprehensive On-Board Safeguards
The board incorporates multiple protection layers—input reverse polarity protection, output short-circuit fold-back limiting, overcurrent cut-off, overvoltage crowbar, and thermal shutdown . This robust protection architecture ensures that even if an external wiring fault occurs, the ABB 1MRK002246-BC will gracefully limit power or shut down rather than sustaining catastrophic damage, preserving the host IED’s other valuable boards.
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