Description
The ABB 1MRK002239-BB is an internal Power Supply / Power Board (switching regulator PCB) used as the primary DC power conversion stage inside selected ABB protection relays (670 series IEDs), bay control units, and certain ACS medium-voltage drive control cabinets. It accepts a wide-range AC/DC auxiliary voltage (typically 88–264 V AC or 110–250 V DC) and generates regulated low-voltage DC rails (+5 V, +12 V, +24 V as required by the host) to power the CPU, I/O boards, display, and communication modules within the enclosure.
Application Scenarios
A 230 kV substation’s REB670 bus differential relay unexpectedly displayed “Low Volt – Shutdown” and went offline during a weekend storm when auxiliary AC momentarily dipped. On-site diagnosis revealed the internal ABB 1MRK002239-BB power board had suffered a failed primary-side capacitor bank — the unit could no longer sustain output under load. The protection team replaced the board with a pre-tested spare 1MRK002239-BB, reseated the connectors, and restored auxiliary power. The relay passed self-test, the firmware booted normally, and the downloaded configuration was already resident in the CPU board’s non-volatile memory — full protection was back online in under 15 minutes. The site’s protection engineer later noted: “We’ve standardized on keeping a 1MRK002239-BB in the spare-parts cabinet for every 670-series panel. It’s a five-minute swap that brings a completely dead relay back to life — far cheaper and faster than replacing the whole IED.”
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1MRK002239-BB |
| Alt./Ref. Code | 1MRK002239 (variant suffix may differ by host unit rev.) |
| Manufacturer | ABB (Protection & Automation — Internal Power Supply PCB) |
| Product Category | Internal Switching Power Supply Board / Power Regulation PCB |
| Input Voltage | 88–264 V AC (47–63 Hz) / 110–300 V DC (wide-range universal input) |
| Output Rails | Typically +5 V DC (main logic), +24 V DC (internal / ext. aux), ±12 V DC (optional, version-dep.) |
| Output Current | 3–8 A on +5 V DC (depending on host load); 0.5–2 A on auxiliary rails |
| Rated Power | ~30–60 W total (host-equipment dependent) |
| Efficiency | ≥ 80% typical at full load |
| Protections | Input fuse, OVP (over-voltage), OCP (over-current), SCP (short-circuit), thermal shutdown |
| Isolation | Input-to-output ≥ 3 kV AC; output-to-chassis ≥ 1.5 kV AC (reinforced insulation) |
| Operating Temp. | -25 °C to +70 °C (-13 °F to +158 °F), convection cooled |
| Indicators | Power OK LED (green) on board face (where fitted) |
| Mounting | Internal PCB mount — captive screws + multi-pin header/edge connector to backplane |
| Dimensions (approx.) | 130 × 90 × 30 mm (L × W × H), varies slightly by host equipment |
| Compliance | EN 50178, IEC 60950-1, CE, UL recognized (as component of host assembly) |
Technical Principles and Innovative Values
The ABB 1MRK002239-BB is engineered for high-reliability operation in substation and industrial environments:
- Innovation Point 1 — Universal AC/DC Wide-Range Input: The board’s flyback/forward topology accepts both AC mains (88–264 V) and DC station battery (110–250 V DC) without manual selection or jumpers. This simplifies sparing across sites with different auxiliary supplies and ensures continued operation during DC float variations or AC-brownout conditions.
- Innovation Point 2 — Tightly Regulated Multi-Rail Output with Sequencing: The 1MRK002239-BB provides independently regulated +5 V (for CPU/logic), +24 V (for internal relays, LEDs, optional external auxiliary), and where required ±12 V (for communication transceivers). Soft-start and power-good signaling prevent the host CPU from booting until all rails are within tolerance.
- Innovation Point 3 — Reinforced Isolation & Surge Withstand: Input-to-output isolation ≥ 3 kV AC and input surge suppression are designed to withstand typical substation transient environments (switching surges, lightning-induced spikes on station service). This protects downstream sensitive electronics — the CPU and I/O boards — from damage that would otherwise propagate from the auxiliary supply.
- Innovation Point 4 — Built-In Self-Monitoring & LED Diagnostics: A green Power-Good LED provides immediate visual confirmation of correct operation during panel walkthroughs or after replacement. The board continuously monitors its own output voltages; if an over-voltage or over-current condition is detected, it latches off or auto-recovers depending on fault type, reporting the condition via absence of the “POK” signal on the backplane.
