Siemens 6EP1331-1SH01 SITOP Power Supply

Product Overview

The Siemens 6EP1331-1SH01 is a compact, single-phase SITOP power supply module engineered to convert AC line voltage into a stable 24 V DC output for industrial control applications. As part of the Siemens SITOP family, this DIN rail-mounted power supply is specifically designed to provide reliable power to PLC systems (such as SIMATIC S7-200, S7-300, and LOGO!), sensors, actuators, and other 24 V DC loads in automation cabinets . The Siemens 6EP1331-1SH01 features a wide input voltage range of 85–264 V AC, making it suitable for global deployment across diverse power grids .

Rated for an output current of 1.3 A at 24 V DC, the Siemens 6EP1331-1SH01 delivers a nominal output power of 31.2 W. Its robust design includes built-in short-circuit and overload protection to safeguard downstream equipment, while the high efficiency exceeding 80% minimizes energy loss and heat generation within the control cabinet . The Siemens 6EP1331-1SH01 is characterized by its compact form factor (72 mm width) and IP20 protection rating, making it an ideal space-saving solution for small switch cabinets and distributed I/O installations. Due to its popularity and the product lifecycle, the Siemens 6EP1331-1SH01 has been phased out and is being superseded by newer models such as the 6EP1331-5BA10 or 6EP1333-2BA01, though it remains a highly sought-after spare for legacy system maintenance .

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	6EP1331-1SH01
Manufacturer	Siemens
Product Type	DIN Rail Power Supply (SITOP Series)
Input Voltage (AC)	85 – 264 V AC (120/230 V AC nominal)
Input Frequency	47 – 63 Hz
Output Voltage	24 V DC (adjustable ±3%, approx. 22.2 – 25.8 V DC)
Output Current	1.3 A
Output Power	31.2 W
Efficiency (typical)	≥ 80%
AC Hold-up Time (187 V input)	> 40 ms
Inrush Current (25 °C)	15 A
Ripple & Noise	< 50 mV pp (typical)
Protection Functions	Short-circuit protection, overload protection, over-temperature shutdown
Mounting	35 mm DIN rail (EN 60715)
Dimensions (W × H × D)	72 × 90 × 55 mm
Weight	Approx. 0.2 – 0.45 kg (variant dependent)
Protection Class	IP20
Certifications	CE, UL, CSA, cRUus

Main Features and Advantages

Compact and Efficient Design: The Siemens 6EP1331-1SH01 stands out with its remarkably narrow 72 mm housing, which significantly reduces the required footprint in crowded control panels. This compact design is combined with high efficiency exceeding 80%, ensuring that the Siemens 6EP1331-1SH01 operates with minimal heat generation. As a result, it supports natural convection cooling, eliminating the need for additional cooling fans and reducing cabinet maintenance requirements .

Superior Input Flexibility and Robustness: Engineered for global deployment, the Siemens 6EP1331-1SH01 features a wide-range input capability (85–264 V AC). This allows the module to be used in regions with unstable power grids without reconfiguration. The hardware is further protected by a robust hold-up time of over 40 ms, which bridges brief power interruptions and prevents system resets, a critical feature for maintaining process continuity . The integrated inrush current limiting (15 A) also protects upstream circuit breakers from nuisance tripping during power-up .

Comprehensive Load Protection: The Siemens 6EP1331-1SH01 provides built-in electronic protection against short-circuits and overloads. In the event of a fault, the module enters a protective mode (typically “Hiccup” or current limiting) and automatically restores output once the fault condition is cleared. This “self-protection” function ensures that the Siemens 6EP1331-1SH01 acts as a reliable guardian for sensitive downstream electronics such as CPUs, input/output modules, and sensors, preventing catastrophic failures .

Simplified Integration and Diagnostics: Designed for the standard 35 mm DIN rail, the Siemens 6EP1331-1SH01 offers “plug-and-play” mechanical installation that is both fast and tool-free. A green status LED on the front panel provides immediate visual confirmation of a healthy 24 V DC output. The Siemens 6EP1331-1SH01 is a standard component of the SITOP family and is perfectly compatible with Siemens automation systems, ensuring seamless integration without the need for complex parameterization .