Description:
The ABB 1MRK000157-MBR00 (also referenced as 1MRK000157-MBr00) is an internal switch-mode power supply circuit board / PCB module used within ABB protection relays, control cubicles, and substation automation equipment such as RELION-series bay controllers and REC / RET rack assemblies. It converts a wide-range AC mains input (85–264 V AC) or DC into a tightly regulated 24 V DC output (typically 6.5 A / 156 W), providing stable auxiliary power to relay logic, binary I/O modules, communication interfaces, and HMI panels housed inside the same enclosure.
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/control 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 circuit board—unscrewing the old PCB from its standoffs, transferring the input/output flying 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 key pain point solved: a form-fit internal PSU replacement that restores voltage margin and ride-through capability without needing to re-wire the entire panel or replace the costly relay/IED main unit.
Parameter:
| 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), also accepts 100–300 V DC (model-dependent) |
| 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 (helps ride through brief mains interruptions) |
| Protections | Overvoltage (OVP), Undervoltage, Overcurrent (OCP), Short-Circuit, Overtemperature – auto-recovery |
| Indicators | DC OK LED (green) / Fault indicator (where fitted) |
| Mounting | Chassis-mount via PCB standoff screws / M3 fixings; flying-lead or terminal-block connection |
| Operating Temp. | -25 °C to +60 °C (derating above 50–55 °C per revision) |
| Dimensions (Ref.) | Approx. 100 × 35 × 40 mm (L × W × H) – bare PCB with heatsink where applicable |
| Certifications | CE, UL, cUL, RoHS (per ABB datasheet for host equipment) |
Technical Principles and Innovative Values:
The 1MRK000157-MBR00 is a purpose-designed internal PSU PCB, not a general-purpose DIN-rail unit. It is optimized for the confined spaces and EMC requirements of protection-relay and control-device housings.
- Innovation Point 1: Wide-Range AC/DC Input with Active PFC for Substation Environments. The 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 cause a comms dropout. The 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 60255-21shock/vibration and IEC 61000-4-11voltage dip immunity.
- Innovation Point 3: Form-Fit PCB Replacement Minimizes MTTR. Because the 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).
