Siemens 6EP1931-2EC21 SITOP DC UPS Module

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Important: A SITOP battery module and a SITOP power supply are required for the DC UPS system to function. The UPS module alone does not provide backup power.

What's Included

• 1 × Siemens 6EP1931-2EC21 SITOP DC UPS Module

Note: Battery module, power supply, and connecting cables are sold separately.

Why Buy From Us?

• In Stock – Ready to ship immediately

• Genuine Siemens Product – Factory original SITOP component

• Warranty Included – Purchase with confidence

• Technical Support – SITOP DC UPS configuration assistance available

Frequently Asked Questions (FAQ)

Q1: What is the Siemens 6EP1931-2EC21?

It is a SITOP DC UPS module rated for 24 V DC / 15 A. It works with a SITOP power supply and a battery module to provide uninterrupted power for critical 24 V DC loads during mains failures.

Q2: Does this module include a battery?

No. The battery module is not included and must be ordered separately. A SITOP battery module (1.2 Ah to 12 Ah) is required for buffer operation.

Q3: What is the difference between 6EP1931-2EC21 and 6EP1931-2EC31?

The 2EC21 (this item) has no communication interface. The 2EC31 includes a serial interface (RS232) for PC-based monitoring and remote shutdown signaling.

Q4: What is the input voltage range?

The input voltage range is 22–29 V DC, with a nominal value of 24 V DC.

Q5: What is the output current rating?

The nominal output current is 15 A in both normal and buffer mode, with a peak current of 15.7 A.

Q6: How is the buffer threshold adjusted?

The cut-in threshold is adjusted via DIP switches on the front of the housing, from 22.0 to 25.5 V DC in 0.5 V steps. The default is 22.5 V DC.

Q7: What are the LED indicators?

• Green LED: Normal operation (input voltage above threshold)

• Yellow LED: Buffer mode (battery supplying load)

• Green LED (Bat>85%): Battery charge greater than 85%

• Red LED (Alarm): Battery needs replacement or battery voltage low

Q8: Does this module provide galvanic isolation?

No. According to the Siemens data sheet, there is no galvanic isolation between input and output.

Q9: What is the operating temperature range?

The standard module operates from 0 to +60 °C. For extended temperature range (-25 to +60 °C) with conformal coating, the SIPLUS variant 6AG1931-2EC21-2AA0 is available.

Q10: Is this product still in production?

It is classified as PM300: Active Product with a phase-out date of 01.10.2026. It remains available through standard channels until that date.

Q11: What should I verify before ordering?

Always verify the exact part number (6EP1931-2EC21 for the version without interface), confirm that you have a compatible SITOP battery module and power supply, and determine whether you need the serial interface version (6EP1931-2EC31) for PC monitoring or remote shutdown capability.