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SITOP

SITOP is a product line of industrial DC power supplies and associated accessories, developed and manufactured by Siemens. The line originated as part of Siemens' industrial automation portfolio and has been refined over decades to address the power requirements of control systems, sensors, actuators, and other 24 V DC loads in factory and process environments. SITOP products are widely used in automotive, packaging, food and beverage, pharmaceutical, and heavy industries where reliable DC power is essential for continuous operation.

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About SITOP

SITOP is a product line of industrial DC power supplies and associated accessories, developed and manufactured by Siemens. The line originated as part of Siemens' industrial automation portfolio and has been refined over decades to address the power requirements of control systems, sensors, actuators, and other 24 V DC loads in factory and process environments. SITOP products are widely used in automotive, packaging, food and beverage, pharmaceutical, and heavy industries where reliable DC power is essential for continuous operation.

The SITOP portfolio includes regulated and unregulated power supplies, DC-UPS systems, redundancy modules, selectivity modules, and buffer modules. These components are designed for DIN rail mounting and are typically used in control cabinets. Power supplies are available in various input voltages (120/230 V AC, 24 V DC, and others) and output voltages (5 V, 12 V, 24 V, 48 V DC), with current ratings from 0.5 A to 40 A and higher. Many units feature adjustable output voltage, overload protection, and high efficiency. The DC-UPS systems, such as the 6EP41373AB000AY0, provide uninterrupted 24 V DC power during mains failures, with power ratings up to 600 VA and battery modules for extended backup. Selectivity modules, like those in SKUs 56JE07, 56JE08, and 56JE09, offer selective overcurrent protection for downstream loads, isolating only the faulty branch while maintaining power to critical circuits. These modules are rated for 24 V DC input and output, with output currents up to 10 A and real power ratings of 18 W.

SITOP products are engineered to meet relevant industrial standards, including IEC/EN 61204-3 for low-voltage power supplies and UL 508 listing for industrial control equipment. Many units carry CE marking and are designed for operation in ambient temperatures up to 60°C, with some models supporting extended temperature ranges. Enclosures typically provide IP20 protection, suitable for installation in control cabinets. The power supplies feature high MTBF values and are tested for shock and vibration according to IEC 60068-2-27 and IEC 60068-2-6. Redundancy modules allow parallel connection of two power supplies for increased availability, while buffer modules bridge short power interruptions. The selectivity modules use electronic current limiting to provide fast, selective disconnection of faulty branches, reducing downtime and simplifying troubleshooting.

3G Electric supplies the SITOP line as part of its industrial equipment distribution portfolio. Available SKUs include DC input UPS systems, selectivity modules, and other accessories for DC power supplies. 3G Electric supports global customers with logistics coordination, documentation, and access to technical specifications. The product range is suitable for system integrators, panel builders, and maintenance teams seeking to maintain or expand existing SITOP installations. For specific part numbers, availability, and lead times, contact 3G Electric directly.

Common Applications

  • Automotive assembly lines — SITOP DC input UPS systems maintain 24 V DC power to PLCs and safety controllers during voltage dips.
  • Process control cabinets — SITOP selectivity modules isolate faulty 24 V DC branches, preventing plant-wide shutdowns in chemical processing.
  • Material handling systems — SITOP redundancy modules with parallel power supplies ensure continuous operation of conveyor controls.
  • Food and beverage packaging — SITOP power supplies with IP20 protection and wide temperature range power sensors and actuators.
  • Pharmaceutical cleanrooms — SITOP buffer modules bridge short power interruptions to keep critical batch processes running.
  • Water treatment plants — SITOP DC-UPS systems provide backup for remote telemetry and SCADA equipment during mains failures.

Frequently asked questions

Common questions about SITOP from 3G Electric.

What is the function of a SITOP selectivity module?

A SITOP selectivity module provides selective overcurrent protection for 24 V DC load circuits. It monitors current to each downstream branch and, in the event of an overload or short circuit, disconnects only the affected branch while keeping power to the remaining loads. This prevents a single fault from shutting down the entire system. Modules are DIN rail mountable, rated for 24 V DC input and output, and typically offer output currents up to 10 A. They are used in control cabinets to improve system availability and simplify fault isolation.

What are the key specifications of the SITOP DC input UPS system 6EP41373AB000AY0?

The SITOP DC input UPS system 6EP41373AB000AY0 provides uninterrupted 24 V DC power to critical loads during mains failures. It has a 600 VA power rating and is designed for industrial automation and control applications. The unit operates with a 24 V DC input and output, and it requires a separate battery module (not included) for backup power. It features DIN rail mounting and is part of the SITOP UPS1600 series. For detailed technical data, refer to the Siemens datasheet.

Can SITOP power supplies be used in redundant configurations?

Yes, SITOP power supplies can be connected in parallel using redundancy modules to increase system availability. Redundancy modules decouple two power supplies, allowing them to share the load and provide backup if one fails. This configuration is common in applications where downtime is costly. SITOP redundancy modules are available for 24 V DC systems and are designed for DIN rail mounting. They include decoupling diodes and monitoring functions to ensure proper operation.

What is the typical efficiency of SITOP power supplies?

SITOP power supplies typically achieve efficiencies between 87% and 94%, depending on the model and load conditions. Higher efficiency reduces energy consumption and heat generation inside control cabinets. For example, the SITOP PSU100S series offers up to 91% efficiency at full load. Efficiency is a key consideration for panel builders aiming to minimize thermal management requirements. Detailed efficiency curves are provided in the technical documentation for each model.

How does 3G Electric support SITOP product procurement?

3G Electric supplies SITOP DC power supplies, UPS systems, and accessories to industrial customers worldwide. The company provides access to product specifications, part number verification, and logistics coordination for global shipments. 3G Electric can assist with identifying the correct SKU for a given application, such as selectivity modules or DC input UPS systems. For current availability, lead times, and pricing, contact 3G Electric directly with your requirements.

Does 3G Electric supply SITOP products?

Yes — 3G Electric (S) Pte. Ltd. supplies SITOP products. We stock the SITOP catalog and supply genuine factory-original products with full manufacturer warranty and technical support.