ABB DSMB-02C Power Unit 3BSE018172R1 | 24V DC Power Source

Description

Application Scenarios

Inside the main control cabinet of a water treatment facility, dozens of critical components—from the processor of an AC 800M controller to the racks of S800 I/O modules and network switches—all require clean, stable 24V DC power. A voltage dip or ripple here could cause a processor to reset or an input module to misread a signal, leading to a process upset. The ABB DSMB-02C​ is deployed as the dependable heart of this power distribution system. Its robust design ensures a constant, well-regulated 24V DC output despite fluctuations in the incoming AC mains. For the system integrator, its compact DIN-rail mounting saves valuable panel space. For the plant maintenance team, its high mean time between failures (MTBF) and diagnostic LED provide confidence in system uptime. The DSMB-02C​ reliably powers the “nervous system” of the automation, addressing the fundamental need for unwavering power quality in industrial control.

Key Parameters

Technical Principles and Innovative Values

The ABB DSMB-02C​ embodies a focus on robustness, power quality, and integration simplicity, translating unstable mains power into the pristine DC power that modern electronics demand.

Innovation Point 1: Wide-Range Input with High Immunity.​ The module accepts an exceptionally wide input voltage range (e.g., 85-264V AC). This means the same power supply can be deployed globally without hardware changes and will provide stable output even during significant “brownouts” or overvoltage events on the plant floor. Combined with high immunity to line-borne transients and electrical noise, it ensures the sensitive control electronics it powers are shielded from the harsh reality of industrial power networks, directly preventing nuisance faults and resets.

Innovation Point 2: Optimized Thermal Management for Longevity.​ Designed for fanless operation (convection cooling), the DSMB-02C​ eliminates a common point of failure—the cooling fan. Its high-efficiency design minimizes heat generation, and its casing is engineered for optimal heat dissipation. This results in a lower operating temperature, which dramatically extends the lifespan of internal components like electrolytic capacitors, directly addressing the core pain point of unexpected power supply failure in hard-to-access control panels.

Innovation Point 3: Modular and Service-Optimized Design.​ The compact, DIN-rail form factor allows for easy, flexible installation in crowded control cabinets. Its design facilitates the implementation of redundant (N+1) power supply systems. A second DSMB-02C​ can be easily paralleled with diode isolation to create a simple but highly reliable redundant power scheme, ensuring that a single power supply failure does not lead to a system shutdown. This modularity provides a cost-effective path to increased system availability.

Application Cases and Industry Value

Case Study: Eliminating Nuisance Trips in a Packaging Line Control Panel

A food and beverage packaging line was experiencing intermittent, unexplained stoppages. The line’s PLC and distributed I/O would occasionally reset, causing a 15-minute line clearance and product loss. After extensive troubleshooting, the issue was traced to voltage sags on the plant’s AC mains, which the existing generic power supplies could not handle, causing their output to drop out briefly.

The solution was to replace the main 24V DC power supplies in the control panels with ABB DSMB-02C​ modules. Their wide input range and robust hold-up time ensured the DC output remained stable during these sags. Furthermore, their high noise immunity eliminated interference from the large servo drives on the line. After the upgrade, the nuisance resets ceased entirely. The plant engineer calculated that the investment in the DSMB-02C​ power supplies was recovered within a month by avoiding production losses, highlighting how a reliable power foundation is critical to overall equipment effectiveness (OEE).

Related Product Combination Solutions

The DSMB-02C​ is a core building block in a reliable control system power infrastructure, often paired with:

Redundancy Module / Diode Block (e.g., DSRD-01):​ A module that allows two or more DSMB-02C​ units to be connected in parallel to form a redundant power system, providing automatic switchover if one fails.

System Power Distribution Units:​ DIN-rail mounted fuse blocks or electronic circuit breakers (e.g., ABB System Pro M​ breakers) used to create protected branch circuits from the DSMB-02C​ output to various loads (PLC, I/O, relays).

DC/DC Converter Modules:​ Used to step down the 24V DC from the DSMB-02C​ to other required voltages (e.g., 5V, 12V) for specific devices.

Uninterruptible Power Supply (UPS):​ A larger system UPS placed beforethe DSMB-02C​ to provide extended backup power during complete AC mains failures, with the DSMB-02C​ providing the final conditioning.

DIN-Rail Enclosures / Mounting Plates:​ Organized hardware for neatly mounting multiple DSMB-02C​ units and related components.

ABB S800 I/O System:​ A primary “customer” for the clean 24V DC power provided by the DSMB-02C, powering the communication interfaces and I/O modules.

Installation, Maintenance, and Full-Cycle Support

Installation is straightforward: mount the module on a DIN rail, connect the AC input (L, N, PE) with proper fusing as per local electrical code, and connect the DC output (+V, 0V) to the distribution system. It is critical to ensure correct torque on screw terminals and proper wire sizing. For reliability, implementing a redundant pair with a diode module is a recommended best practice.

Maintenance is minimal due to the fanless design. Primary tasks include ensuring adequate ventilation around the module, periodically checking for dust buildup, and monitoring the status LED. In a redundant setup, a failure of one unit will be indicated by its LED, and it can be replaced live without interrupting the controlled process. We provide comprehensive support for the DSMB-02C, from assisting with system power design and load calculations to supplying guaranteed authentic modules. We can also provide redundancy kits and advise on best practices for creating a fault-tolerant power system for your critical automation infrastructure.

Build your control system on a foundation of reliable power. Contact us for the genuine ABB DSMB-02C power supply and our expert application support.