ABB 3BHL000986P3105 — High-Integrity Redundant Power Supply Module for AC/DC Critical Control Systems

Let’s cut to the chase: this isn’t just another power supply. The ABB 3BHL000986P3105 is a dual-redundant 24 VDC power module designed specifically for use in ABB’s 800xA and Symphony Plus DCS cabinets—where uptime isn’t optional. I’ve seen it deployed in refinery control rooms where even a 90-second brownout triggers safety shutdowns, and in pharma cleanroom HVAC controllers where voltage ripple can skew sensor calibration. It’s built to hold the line when the grid stutters.

Key Features

• Dual-redundant hot-swap design: Two independent 24 VDC outputs (each rated 10 A) that automatically share load—and seamlessly take over if one fails. No manual switchover, no logic interruption.
• Wide-input AC range (85–264 VAC): Handles fluctuating site power without derating—useful in older plants or remote substations where voltage sags are common.
• Integrated diagnostics & relay alarm output: Front-panel LEDs show status per channel, and a dry-contact relay signals “power fault” to your DCS alarm system—no extra wiring needed.
• EMC-hardened for industrial cabinets: Meets IEC 61000-6-2/6-4, so it won’t misbehave next to VFDs or high-current contactors in the same enclosure.
• Compatible with ABB’s S800 I/O termination modules: Plugs directly into standard S800 mounting rails and talks natively to AC 800M controllers via backplane power monitoring.

Technical Specifications

Application Fields

This module shows up where reliability has contractual weight: offshore platform control systems (where spares are costly and lead times long), continuous-process chemical plants running 24/7 batch sequences, and nuclear auxiliary control panels where redundancy is mandated—not recommended. One customer in Rotterdam told me they swapped out three legacy single-supply units after two unscheduled trips caused by undervoltage lockouts during monsoon season. Since installing the 3BHL000986P3105, their last power-related event was over 18 months ago.

Advantages & Value

From a procurement standpoint, this unit reduces risk exposure—not just cost. Its native integration with ABB’s ecosystem means less engineering time spent on interface specs or custom alarm mapping. Spare parts are standardized across most 800xA sites, so stocking one unit covers multiple cabinet types. And while it’s priced higher than generic DIN-rail PSUs, you’re not paying for branding alone: the thermal design allows full-load operation at 55 °C ambient (many competitors throttle at 40 °C), and the 5-year MTBF rating (per IEC 61709) holds up in real-world field data from ABB’s reliability database. In many cases, the TCO over 5 years ends up lower—even with the premium sticker price.

Installation & Maintenance

Mount it in a clean, ventilated cabinet meeting IEC 61800-5-1 (IP2X minimum). Avoid direct proximity to heat sources like thyristor stacks or transformer banks—leave at least 50 mm clearance above and below. Wiring must use 1.5 mm² stranded copper (min.) with proper ferrules; torque terminals to 0.5 N·m. Safety-wise: always isolate both L/N and PE before insertion—this unit doesn’t have a main disconnect switch. For maintenance: visually inspect terminals quarterly for discoloration or loosening; verify output voltage under load annually (±1% tolerance); firmware updates aren’t applicable here, but ensure your AC 800M controller is on a supported version for full backplane monitoring. Calibration isn’t required—the output is factory-trimmed and drift-free over temperature.

Quality & Certifications

Carries CE (2014/30/EU, 2014/35/EU), UL 61010-1 (File E329241), RoHS 2011/65/EU, and ABB’s internal 100-hour burn-in test. Backed by a standard 365-day warranty—extended to 24 months if registered within 30 days of delivery. All units ship with traceable serial numbers and full test reports. If you need replacement fast: it’s stocked in our EU warehouse, and we ship within 1 business day for in-stock orders (typically arrives in 3–4 days via DHL Express). For larger quantities, lead time rarely exceeds 3 weeks—even with custom labeling.