The Siemens 6EP1931-2EC21 is a SITOP DC UPS module designed to provide uninterrupted 24 V DC power for critical industrial loads. It operates in conjunction with a SITOP power supply and a maintenance-free battery module to bridge mains failures, ensuring that control systems, industrial PCs, and critical sensors remain powered without interruption.
Item No :
6EP1931-2EC21Order(MOQ) :
1Payment :
EXWProduct Origin :
GermanyShipping Port :
Wuhan, Hubei, ChinaLead Time :
3-5 daysWeight :
0.4kgOverview
6EP1931-2EC21 SIMATIC PLC Module
New in stock
Origin from Germany
Payment Method: TT.Western Union
Shipping Method: DHL\UPS\Fedex\EMS\Others
More Brands
| Part Number | Description | Key Difference |
|---|---|---|
| 6EP1931-2EC21 | DC UPS Module, 24V/15A, without interface (this item) | Standard module |
| 6EP1931-2EC31 | DC UPS Module, 24V/15A, with serial interface | RS232 communication for PC monitoring |
| 6EP1931-2EC42 | DC UPS Module, 24V/15A, with USB interface | USB communication |
| 6AG1931-2EC21-2AA0 | SIPLUS variant, conformal coating, -25 to +60°C | Extended temperature/harsh environment |
| SITOP Battery Modules | 1.2 Ah to 12 Ah lead-gel | Required for buffer operation |
| SITOP Power Supply | 24 V DC power supply | Provides normal-mode input power |
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.
1 × Siemens 6EP1931-2EC21 SITOP DC UPS Module
Note: Battery module, power supply, and connecting cables are sold separately.
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
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.
Siemens 6FX3002-5CL11-1AF0 is a pre-assembled MOTION-CONNECT 300 power cable designed for use with SIMOTICS S-1FL6 servo motors and SINAMICS V70/V90 servo drives.
Siemens 6SL3210-5FE11-0UF0 is a SINAMICS V90 servo converter designed for use with SIMOTICS S-1FL6 servo motors. It features a PROFINET communication interface and is suitable for a wide range of motion control tasks.
Siemens 6ES7960-1AA06-0XA0 is a synchronization module (Version 6) designed for the SIMATIC S7-400H fault-tolerant control system. It is used to couple the two central processing units (CPUs) in the redundant setup via fiber-optic patch cables up to 10 meters in length.
Siemens 6EP1332-5BA10 is a SITOP PSU100C power supply module with an input of 120–230 V AC (110–300 V DC) and an output of 24 V DC / 4 A. It belongs to the compact SITOP power supply family, designed for industrial automation applications requiring a reliable 24 V DC power source.
C79451-A3468-B521 is a Siemens spare part, specifically the SO₂ receiver chamber (detector) for the ULTRAMAT 23 gas analyzer.
Siemens C79451-A3468-B206 is the infrared source (also referred to as an IR radiator or projector) designed as a replacement component for the ULTRAMAT 23 series gas analyzers. It serves as the radiation emitter for the infrared measurement channels used to detect gases such as CO, CO₂, NO, SO₂, and CH₄.
C79451-A3494-B16 is a Siemens spare part, specifically an LCD module used in the ULTRAMAT 23 gas analyzer series.
C79451-A3494-D501 is a Siemens spare part, specifically a motherboard (base plate) with firmware for the ULTRAMAT 23 gas analyzer.
Scan to Wechat :
Scan to WhatsApp :
