ABB SD834 3BSC610067R1 24V DC 20A Power Supply Module

Product Overview

The ABB SD834 (Part Number: 3BSC610067R1) is a highly efficient, industrial-grade switch-mode power supply designed to deliver stabilized 24 V d.c. power to critical process automation systems. Engineered for high-reliability environments such as SELV (Safety Extra-Low Voltage) and PELV (Protected Extra-Low Voltage) applications, this robust 480W power module provides a nominal output current of 20 A. It supports a broad mains input voltage range, features automatic load sharing for parallel operation, and includes a built-in supervision relay to continuously monitor output status and system health.

Key Advantages

• Outstanding Conversion Efficiency: Features a high energy-efficiency rating of up to 92.4% / 93.9%, minimizing thermal dissipation inside control cabinets and extending component lifespans.
• Robust Overload & Short Circuit Recovery: Utilizing an intelligent "Hiccup" protection mode (2s on, 17s off) for secondary short circuits, the module automatically recovers without requiring manual intervention or system resets.
• Superior Power Hold-Up Capabilities: Engineered with premium internal storage capacitors to sustain output voltage during temporary mains sagging, providing critical hold-up times (e.g., up to 100 ms typical at 230 V / 10 A).
• Flexible Input Compatibility: Operates reliably under wide AC and DC supply fluctuations (85-276 V a.c. / 88-187 V d.c.), making it ideal for worldwide power grids and industrial battery backup systems.

Technical Specifications

Quick Installation Tips

• DIN Rail Mounting & Clearances: Mount the module vertically on a standard 35 mm DIN rail. To ensure proper natural convection cooling, maintain a minimum airflow clearance of 40 mm above and below the device, and 15 mm on each side.
• Input Fuse Protection: While the unit features internal protection, installing a recommended external input fuse (rated between 10-20 A) on the supply line is highly recommended to protect downstream hardware and cable runs.
• Parallel Operation & Load Sharing: When connecting multiple SD834 units in parallel to increase capacity or create redundancy, make sure to adjust all output voltages to match exactly before tying the outputs together to ensure balanced load sharing.

Technical FAQs

Q1: What does "Hiccup Mode" mean when a secondary short circuit occurs?

A1: Under short-circuit conditions, the SD834 switches into a protective pulsing state (2 seconds on, 17 seconds off). This cycle repeats indefinitely without overheating or burning out the supply, and normal 24V power automatically resumes as soon as the short circuit is cleared.

Q2: Why is the hold-up time crucial, and how long can the SD834 maintain power?

A2: Hold-up time is the duration the power supply can maintain a regulated output during a brief input voltage dip. Depending on the load, the SD834 typical hold-up time ranges from 100 ms (at 230V AC input and 10A load) down to 32 ms (at 120V AC input and 20A full load), preventing controllers from rebooting during momentary grid fluctuations.

Q3: Can this module be used in both SELV and PELV electrical systems?

A3: Yes. The SD834 is fully compliant with safety requirements for Safety Extra-Low Voltage (SELV) and Protected Extra-Low Voltage (PELV) architectures, providing secure galvanic separation between high mains input voltages and low-voltage field electronics.