SITOP

SITOP power supplies generally accept a wide-range AC input of 85 to 264 V AC (single-phase) or 320 to 575 V AC (three-phase), depending on the model. Many units also support DC input, such as 24 V DC for DC/DC converters. The exact range varies by series; for example, the SITOP PSU100L series operates on 120/230 V AC auto-selecting, while the SITOP PSU8200 series handles 3-phase inputs. Always verify the datasheet for the specific part number.

SITOP selectivity modules, such as the 6EP44387FB003DX0, are installed downstream of a 24 V DC power supply to provide selective overload protection. They monitor the current on each output channel and trip individual channels if an overload or short circuit occurs, while leaving other channels operational. This prevents a single fault from shutting down the entire DC bus, which is critical for maintaining power to essential loads like PLCs or safety systems. The modules typically have a rated output current of 10 A per channel and are DIN-rail mounted.

A SITOP UPS module (e.g., 6EP41373AB000AY0) provides uninterrupted power by switching to an internal battery or capacitor bank when the input voltage fails, offering buffering times from seconds to minutes. It includes a charging circuit and outputs a regulated 24 V DC. A buffer module, in contrast, uses capacitors to bridge short voltage dips (typically up to a few seconds) without a battery, making it suitable for ride-through during brief interruptions. UPS modules are used for longer outages, while buffer modules are for transient protection.

Some SITOP power supply models are certified for use in hazardous locations, such as those with ATEX or IECEx approvals for Zone 2 or Class I Division 2 environments. For example, the SITOP PSU8600 series includes variants with Ex certification. However, standard SITOP units are designed for general industrial environments (IP20) and are not intrinsically safe. Check the specific model's certification markings and datasheet for hazardous area suitability before installation.

SITOP power supplies typically achieve efficiency ratings between 85% and 95%, depending on the series and load conditions. For instance, the SITOP PSU100L series has an efficiency of approximately 88% at nominal load, while the SITOP PSU8200 series can reach up to 95% due to its three-phase design and advanced switching topology. Efficiency is measured at full load and nominal input voltage; partial loads may yield slightly lower values. These figures are published in the technical datasheets.

To select a SITOP UPS module, determine the required output voltage (typically 24 V DC), total load current (in amperes), and desired backup time. The UPS module's power rating (in VA or W) must exceed the load's power consumption. For example, a 600 VA module like the 6EP41373AB000AY0 can support a 24 V DC load up to 25 A for a short duration, but actual backup time depends on the connected battery or capacitor module. Also consider input voltage compatibility (e.g., 24 V DC input) and DIN-rail mounting requirements. Consult the SITOP UPS selection guide for detailed sizing.