Siemens Sitop DC UPS Module, 24VDC, 6A Part number 6EP1931-2DC21

Product Overview

The Siemens 6EP1931-2DC21 is the Siemens SITOP DC UPS module 24 V/6 A — an uninterruptible-power supply module designed to provide 24 V DC backup power in the event of supply interruption. It ensures continuous operation of control systems, PLCs or automation components by automatically switching to battery backup when input voltage drops below defined threshold.

Key Features

• DC UPS module, output 24 V DC / 6 A for backup power
• Suitable for DIN-rail mounting — compact width (approx. 50 mm)
• Battery-buffered supply: ensures uninterrupted DC output during mains supply failure
• Automatic switchover to battery when supply voltage falls below adjustable threshold
• Short-circuit protected output for safe operation
• Stable 24 V output under normal and buffering operation
• Efficient conversion — approx. 95 % efficiency at rated load
• Compatible with Siemens battery modules for extended backup time
• Provides reliable power back-up for PLCs, control cabinets, automation modules, safety circuits or critical devices

Technical Specifications

• Article Number: 6EP1931-2DC21
• Product Type: SITOP DC UPS 24 V / 6 A (UPS module without interface)
• Input Supply Voltage: 24 V DC (nominal) — acceptable range 22 … 29 V DC depending on buffer-threshold settings
• Nominal Output Voltage: 24 V DC (in normal and battery-buffered operation)
• Rated Output Current: 6 A (continuous)
• Output Power (nominal): Approx. 144 W at full load
• Output Characteristic: Short-circuit protected, stable output during supply interruption
• Efficiency: Approx. 95% at rated load
• Mounting: DIN-rail mounting, width approx. 50 mm
• Backup Function: Automatic switchover to battery/buffer when input voltage drops below threshold — ensures uninterrupted 24 V supply
• Application Scope: Backup power for PLCs, automation modules, control cabinets, safety circuits, communication devices, remote monitoring or other critical loads requiring 24 V DC reliability
• Type of Energy Storage: External battery module (SITOP battery module) required — provides buffering energy when mains fails

Compliance & Integration

• Part of Siemens SITOP DC UPS module family — designed for industrial 24 V DC automation power systems
• Intended for global industrial and automation applications requiring uninterrupted 24 V DC supply during mains disturbances
• Short-circuit protected output and DIN-rail form factor make it suitable for control cabinets and switchgear panels

Applications

The 6EP1931-2DC21 is used wherever continuous 24 V DC supply is critical — for PLC systems, remote I/O racks, safety systems, communications, data logging, machine controllers or any automation equipment that must remain operational during supply interruptions. It is especially suited for small to medium control panels, machine control stations or distributed automation setups requiring UPS-class reliability in a compact form.