Application Scenarios
Imagine a 132 kV substation where the ABB protection relay panel begins experiencing random LCD dimming and occasional binary-input module resets during monsoon-season voltage sags. The site technician opens the relay cabinet, checks the internal power distribution, and identifies the culprit: the original 15-year-old internal PSU board shows bulging capacitors and a measured output of only 22.1 V DC under load. The technician replaces it with a genuine ABB 1MRK000157-MBR00—unscrewing the old PCB from its standoffs, transferring the input/output leads to the new board’s screw terminals, and seating it in the same mounting positions . On power-up the green DC-OK LED illuminates; output stabilizes at 24.0 V DC even during the next recorded mains dip to 92 V AC. The protection system’s self-diagnostics clear, and the spurious resets vanish .
The core pain point solved by the ABB 1MRK000157-MBR00 is the restoration of voltage margin and ride-through capability without needing to re-wire the entire panel or replace the costly relay/IED main unit . For maintenance teams managing aging ABB protection infrastructure, this board represents a critical spare that can transform a potential multi-hour panel rework into a 15-minute board swap.
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1MRK000157-MBR00 (Alt: 1MRK000157-MBr00) |
| Manufacturer | ABB (Sweden/Switzerland) |
| Product Category | Internal Switch-Mode Power Supply Circuit Board / PSU PCB Module |
| Input Voltage | 85–264 V AC (47–63 Hz) / 100–300 V DC (wide-range) |
| Output Voltage | 24 V DC ±1% (adjustable via trim pot on some revisions) |
| Rated Output Current | 6.5 A continuous (approx. 156 W @ 24 V DC) |
| Efficiency | ≥ 92% (typical 94% at full load) |
| Hold-Up Time | ≥ 20 ms @ full load (bridges brief mains interruptions) |
| Protections | Overvoltage (OVP), Undervoltage, Overcurrent (OCP), Short-Circuit, Overtemperature – auto-recovery |
| Status Indicators | DC OK LED (green) / Fault indicator |
| Operating Temperature | -25°C to +60°C (derating above 50–55°C per revision) |
| Storage Temperature | -40°C to +85°C |
| Mounting Method | Chassis-mount via PCB standoff screws; flying-lead or terminal-block connection |
| Dimensions (Reference) | Approx. 100 × 35 × 40 mm (bare PCB with heatsink) |
| Weight | Approx. 0.26–0.50 kg (variant-dependent) |
| Certifications | CE, UL, cUL, RoHS |
Parameter annotations: The ≥20 ms hold-up time is critical for protection systems—even a 5 ms loss of 24V DC auxiliary can cause a relay to reboot and lose its trip log . The board’s ability to tolerate severely fluctuating plant supplies from 85 V AC during system faults up to 264 V AC, and also accept DC station battery voltage (110–220 V DC), eliminates the need for region-specific PSU variants . IP20 protection rating indicates installation inside a protected control cabinet .
Technical Principles and Innovative Values
Innovation Point 1: Wide-Range AC/DC Input with Active PFC for Substation Environments
The ABB 1MRK000157-MBR00 tolerates severely fluctuating plant supplies—from 85 V AC during system faults up to 264 V AC—and also accepts DC station battery voltage (110–220 V DC in many configurations via the wide DC range) . This universal-input design eliminates the need for region-specific PSU variants and ensures compatibility with both AC-mains-fed and DC-battery-backed control schemes common in HV substations .
Innovation Point 2: ≥20 ms Hold-Up Time to Prevent Nuisance Resets on Mains Sag
In protection and control systems, even a 5 ms loss of 24 V DC auxiliary can cause a relay to reboot and lose its trip log or suffer communications dropout . The ABB 1MRK000157-MBR00 is specified with a hold-up time that bridges typical short-duration voltage dips, keeping downstream electronics alive through minor supply transients—a critical feature for compliance with IEC 60255-21 shock/vibration and IEC 61000-4-11 voltage dip immunity .
Innovation Point 3: Comprehensive Multi-Layer Protection Architecture
The board integrates overvoltage, undervoltage, overcurrent, short-circuit, and overtemperature protection with auto-recovery capability . Compared to generic power supplies that may lack coordinated protection, the ABB 1MRK000157-MBR00 ensures that downstream relays, binary I/O modules, and communication interfaces are safeguarded from electrical faults that could otherwise cascade into system-wide failures .
Innovation Point 4: Form-Fit PCB Replacement Minimizes MTTR
Because the ABB 1MRK000157-MBR00 is dimensionally and electrically identical to the original factory-fitted board in ABB cubicles, replacement requires no panel modification, no new cutouts, and no re-termination of field wiring beyond moving the input/output leads to the new terminal block . For maintenance teams holding this as a critical spare, mean-time-to-repair on a failed internal PSU drops from hours (panel rework) to under 15 minutes (board swap + functional check) . This differentiates it from off-the-shelf DIN-rail supplies that would require extensive cabinet modification and re-wiring.
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