Application Scenarios

In a modern packaging machine’s control cabinet, a new vision inspection system and several IO-Link sensors are being added, requiring additional clean 24V DC power. The main system power supply is already at capacity. The machine builder selects the ABB SW 32-24 D 35 U​ for its compact size, allowing it to fit in the limited remaining DIN rail space. Its wide 85-264V AC input range means it can be installed without modification in plants worldwide. The module powers the new devices reliably, and its built-in overload and short-circuit protection ensures that a fault in a single sensor does not take down the entire machine’s control logic, demonstrating its role as a robust, space-saving power backbone for expanding automation systems.

 

Parameter

Main Parameters	Value/Description
Product Model​	SW 32-24 D 35 U​
Manufacturer​	ABB
Product Category​	DIN Rail Switching Power Supply
Input Voltage​	85 – 264 V AC (47 – 63 Hz) / 120 – 370 V DC
Output Voltage​	24 V DC
Rated Output Current​	1.5 A
Rated Output Power​	36 W
Efficiency​	Typically >85% (High efficiency reduces heat generation)
Protections​	Short-circuit, Overload, Overvoltage
Housing​	Plastic, compact design
Mounting​	Standard 35 mm DIN Rail (EN 60715)
Operating Temperature​	-25°C to +70°C (with derating above 50°C)
Safety Standards​	CE, UL, cUL, RCM (Compliant with major international standards)

 

 

Technical Principles and Innovative Values

• Innovation Point 1: Universal Wide-Range Input:​ The core design innovation of the ABB SW 32-24 D 35 U​ is its truly universal input voltage range (85-264V AC). This is achieved through advanced switch-mode power supply (SMPS) topology with active power factor correction (PFC) or a similar wide-range design. This eliminates the need for manual voltage selection switches or stocking different models for 120V and 230V regions. A machine built in Europe with this power supply can be shipped and commissioned in North America or Asia without any hardware changes, drastically simplifying global machine design and spare parts logistics.
• Innovation Point 2: Compact Power Density with Robust Protection:​ Despite its small footprint, the SW 32-24 D 35 U​ delivers a reliable 36W of power. It integrates comprehensive protection circuitry that provides both safety and reliability. The output is protected against short-circuits and sustained overloads, with automatic recovery once the fault is cleared. This self-protecting design prevents catastrophic failure and minimizes downtime, as it often resets without requiring a physical component replacement.
• Innovation Point 3: Enhanced Reliability for Industrial Environments:​ The module is engineered for the harsh conditions of an industrial control cabinet. Its ability to operate at temperatures up to 70°C (with appropriate derating) and its high immunity to input voltage fluctuations and surges ensure stable performance where cheaper commercial-grade power supplies would fail. This focus on industrial-grade components and design translates directly into higher mean time between failures (MTBF) for the entire control system.

 

Application Cases and Industry Value

Case Study: Water Treatment Plant Distributed I/O Cabinet Upgrade.​ A municipal water treatment plant was upgrading its legacy control system to a distributed architecture, placing remote I/O panels near the filter beds and chemical dosing stations. These outdoor panels required a local, reliable 24V DC source for the I/O modules and instruments. The ABB SW 32-24 D 35 U​ was selected for its proven reliability, wide temperature range, and compliance with industrial standards. Dozens of these units were installed. Over five years of operation, through summer heat and winter cold, not a single SW 32-24 D 35 U​ unit failed. The plant’s electrical supervisor noted, “The ABB SW 32-24 D 35 U​ power supplies are the unsung heroes of our upgrade. They just work. Their reliability in non-conditioned outdoor cabinets has been exceptional, eliminating a common point of failure and reducing our maintenance rounds significantly.”