Siemens SITOP PSU8600 Buffer Module 6EP1961-3BA21, 24 V DC, 100 W, 200 ms, Capacitor-Based, DIN Rail

With a buffer time of 200 ms at full 100 W load, the Siemens 6EP1961-3BA21 buffer module bridges micro-outages and ensures uninterrupted 24 V DC power for your SITOP PSU8600 system. Its capacitor-based energy storage delivers 20 J of backup energy without maintenance, making it ideal for critical automation processes.

Overview

Engineered for seamless integration with the Siemens SITOP PSU8600 power supply system, this buffer module maintains output voltage during brief power interruptions. It stores energy in high-capacity electrolytic capacitors, providing a reliable and wear-free alternative to battery-based solutions. The module mounts directly onto a DIN rail and communicates status via integrated LEDs for operation, buffer readiness, and fault conditions.

What stands out

• Ultra-fast response: buffers for 200 ms at 100 W, extending to 10 s at 10 W.
• Maintenance-free: capacitor technology eliminates battery replacement and reduces downtime.
• Integrated communication: status and diagnostics available through PSU8600 via PROFINET or EtherNet/IP.
• Wide temperature range: operates from -25 °C to +70 °C, suitable for harsh environments.
• High efficiency: >99% energy conversion, minimizing heat generation.
• Global certifications: CE, cULus, ATEX, IECEx, and marine approvals (DNV GL, ABS, NK, RINA, LR, BV).

Technical details

• Input voltage: 24 V DC (from SITOP PSU8600)
• Output voltage: 24 V DC
• Buffer power: 100 W
• Buffer time at 100 W: 200 ms
• Buffer time at 10 W: 10 s
• Energy storage: 20 J
• Max input current: 4.5 A
• Max output current: 4.5 A
• Efficiency: >99%
• Mounting: DIN rail
• Degree of protection: IP20
• Operating temperature: -25 °C to +70 °C
• Status indicators: LEDs for operation, buffer ready, fault
• Compatibility: Siemens SITOP PSU8600 power supply system

Our verdict

The Siemens 6EP1961-3BA21 buffer module is a compact, reliable safeguard for your 24 V DC automation power. Its capacitor-based design ensures long service life and zero maintenance, while the 200 ms hold-up time covers most power glitches. For engineers seeking a robust, certified solution that integrates seamlessly with PSU8600, this module is an excellent choice.