Application Scenarios
In a 220kV substation in Central China, the protection relay panels experienced intermittent “power supply fault” alarms that caused nuisance tripping of feeder breakers during lightning storms. After diagnosing the issue as voltage instability from an aging power module, the maintenance team replaced the unit with a ABB 1MRK002238-DA SR91C830. The wide input voltage range (85–264V AC) absorbed the voltage sags without disruption, and the stable 24V DC output restored relay communication integrity. The substation has since operated without a single power-related protection dropout—a testament to the module’s role in safeguarding critical grid infrastructure.
The ABB 1MRK002238-DA is equally vital in gas-fired power plants, where it powers ABB Relion 615 series protection devices, and in industrial manufacturing facilities, where it supplies stable 24V DC to PLC racks, sensors, and solenoid valves. Its compact form factor (90×51×50mm) allows dense panel mounting, while its high efficiency (up to 98%) minimizes cabinet heat buildup—a key advantage in high-density control rooms.
Technical Parameters
| Parameter | Value / Description |
|---|---|
| Product Model | ABB 1MRK002238-DA (also designated SR91C830) |
| Manufacturer | ABB |
| Product Category | Industrial Power Supply Module (Switching Mode) |
| Input Voltage Range | 85 – 264 V AC (50/60 Hz) or 110 – 250 V DC |
| Nominal Output Voltage | 24 V DC |
| Output Current | 4 A (typical) – up to 5A on some variants |
| Output Power | ~96 W – 120 W (variant-dependent) |
| Efficiency | ≥95% – up to 98% (reduces heat generation) |
| Protection Features | Overcurrent, overvoltage, short-circuit, and thermal protection with self-recovery |
| Protection Class | IP20 (cabinet installation) |
| Operating Temperature | -10°C to +55°C (typical); some variants -25°C to +70°C |
| Dimensions (W×H×D) | Approx. 90 × 51 × 50 mm |
| Weight | Approx. 0.2 – 0.25 kg |
| Mounting | Panel or DIN rail mount (included variants) |
| Certifications | CE, UL, CSA |
Technical Principles and Innovative Values
Innovation Point 1: Universal Wide-Range Input for Global Deployment
The ABB 1MRK002238-DA accepts 85–264V AC and 110–250V DC, enabling seamless integration into sites with 110V AC, 220V AC, or substation battery bank voltages (110V DC, 220V DC). This eliminates the need for separate voltage-specific power supplies, reducing spare parts inventory and simplifying system design. In the event of an AC mains failure, the module can automatically switch to DC battery backup without interruption—a critical feature for emergency protection systems.
Innovation Point 2: High-Efficiency Energy Conversion (≥95%)
With efficiency ratings reaching up to 98%, the ABB 1MRK002238-DA converts over 95% of input power into usable DC output, minimizing energy loss and heat generation. This directly translates to lower cabinet cooling requirements, extended component lifespan, and reduced operational energy costs—a measurable advantage over older linear regulators.
Innovation Point 3: Comprehensive Protection with Self-Recovery
The module features built-in overcurrent, overvoltage, short-circuit, and overtemperature protection with automatic recovery. If the output is shorted, the module enters current-limiting mode and automatically resumes normal operation once the fault clears—preventing cascading failures without manual intervention.
Innovation Point 4: Compact Footprint for High-Density Cabinets
Measuring just 90×51×50mm and weighing 0.2kg, the ABB 1MRK002238-DA allows dense installation in space-constrained control cabinets without sacrificing output capacity. This density advantage is particularly valuable in retrofit scenarios where cabinet real estate is at a premium.
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