Description

The ABB S-073N (Order No.: 3BHB009884R0021) is a high-performance, 24 VDC / 20 A (480 W) industrial power supply engineered for mission-critical applications within ABB’s automation ecosystem, including the AC 800M programmable logic controller (PLC), System 800xA distributed control system (DCS), and legacy Symphony Plus platforms.

Designed for continuous 24/7 operation in demanding industrial settings, the S-073N delivers stable, low-noise DC power to CPUs, remote I/O stations, communication modules (e.g., CI854), and operator interfaces. Its fanless, convection-cooled design, wide input voltage range, and integrated DC-OK relay signal make it ideal for environments where reliability, safety, and diagnostic visibility are non-negotiable—such as refineries, power plants, and water infrastructure.

Application Scenarios

At a large LNG terminal in Australia, an AC 800M-based safety system began experiencing intermittent reboots during summer peak loads. Investigation revealed that the existing third-party 15A power supply was overheating and entering thermal shutdown under sustained 18A demand from expanded I/O racks. The engineering team replaced it with the ABB S-073N 3BHB009884R0021. leveraging its 20A continuous rating, superior thermal design, and 85–264 VAC input tolerance. The DC-OK relay was wired into the plant’s alarm system, enabling real-time monitoring of power health. Since installation, the control system has operated without a single power-related fault over 22 months—proving that in critical infrastructure, power capacity isn’t just about watts; it’s about resilience.

Technical Principles and Innovative Values

Innovation Point 1: True System Integration – The S-073N is validated by ABB for electromagnetic compatibility (EMC) and thermal performance within AC 800M cabinets, ensuring no interference with sensitive analog or communication signals—unlike generic PSUs that may pass basic CE but fail in dense control panels.

Innovation Point 2: Predictive Diagnostics via DC-OK – The built-in relay provides a dry contact that closes only when output voltage is stable. This enables integration into System 800xA alarms, SCADA systems, or safety interlocks—turning power status into actionable operational intelligence.

Innovation Point 3: Fanless Reliability in Dusty/Humid Areas – With no moving parts, the S-073N resists failure in environments where fans clog (e.g., cement plants) or corrode (e.g., coastal facilities), supporting ABB’s “fit-and-forget” philosophy for critical infrastructure.

Innovation Point 4: Redundancy-Ready Architecture – The S-073N can be paralleled with an identical unit using an optional diode redundancy module (e.g., ABB TD540 or third-party equivalent) to create N+1 redundant power—essential for SIL2/SIL3 or continuous-process applications.

Application Cases and Industry Value

A European district energy provider deployed S-073N units across 18 substation control rooms to power AC 800M-based heat exchanger controllers. Previously, summer temperatures caused generic supplies to derate or shut down. The S-073N’s extended thermal range and efficient design eliminated outages. Maintenance teams now use the DC-OK signal to trigger automated work orders in Maximo—reducing mean time to repair (MTTR) by 70%.

In a North American semiconductor fab, the S-073N powers ultra-cleanroom exhaust control systems where particulate generation from fans is prohibited. Its silent, fanless operation met ISO Class 5 requirements while delivering stable power to fast-response damper actuators.

Related Product Combination Solutions

ABB TD540: Diode redundancy module – enables parallel operation of two S-073N units

ABB AC 800M PM866: Redundant CPU – powered by S-073N in high-availability systems

ABB CI854: Communication interface – requires clean 24V from S-073N for Profibus stability

ABB TU851/TU854: Terminal units – distribute S-073N power to I/O modules (e.g., AI810. DO820)

ABB System 800xA: DCS platform – ingests DC-OK status for asset health dashboards

ABB 3BHB009883R0021: S-072N – lower-current variant (10A) for smaller I/O groups

Phoenix Contact QUINT4-PS/1AC/24DC/20: Competitor alternative – but lacks native ABB validation

ABB Ability™ Asset Performance Management: Cloud service – can trend power health data for predictive maintenance

Installation, Maintenance, and Full-Cycle Support

Installation: Mount the S-073N on a standard 35 mm DIN rail in the control cabinet. Connect AC input (L/N/PE) and 24VDC output to the distribution bus. Wire the DC-OK relay contacts to a PLC digital input or alarm panel for monitoring. Torque terminals to 0.8–1.0 Nm.

Maintenance: No routine service required. Periodically verify output voltage under load and ensure ventilation clearance (min. 20 mm on sides). In redundant setups, test failover annually by disconnecting one supply.

We supply only 100% genuine ABB S-073N 3BHB009884R0021 units, each tested for output stability, protection response, and DC-OK functionality. Our support includes lifecycle status updates, obsolescence planning, and rapid exchange programs. With global inventory and deep expertise in ABB automation architecture, we ensure your power foundation remains unshakable.