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Features Benefits Extremely current-limiting PSR series high-speed square body fuses reduce peak let-through current and let-through energy to protect semiconductor components and devices. Indication with micro-switch Visual blown fuse indication on the fuse and optional micro-switch feature offer remote indication/alarm communication. Optimized performance PSR series high-speed square body fuses have a very balanced speed of operation and energy efficiency. Flush end terminals Flush end terminals allow for the fuse to be mounted directly to the bus-bar. RoHS and REACH-compliant PSR series high-speed square body fuses are environmentally friendly.

Variable frequency drives, inverters, UPS, rectifiers, and soft-starters are examples of typical equipment designed with sensitive power semiconductor devices that cannot withstand any line surge or overcurrent conditions and require high-speed protection. Additionally, PSR series fuses are widely used in high-dc applications such as dc common bus systems, battery energy storage systems, and dc power supplies.

They are commonly found in numerous applications including pulp and paper industries, cranes and heavy-lifting equipment, processing industries, wastewater, treatment plants, and various large factories. Such products are also commonly found in Battery energy storage systems, IT infrastructure (data centers that use UPS), critical power application that utilizes UPS, and EHouses used in drilling rigs in oil & gas industry.

With the rise of dc applications (including energy storage, EV charging station, and UPS), there is a growing need for enhanced dc protection to safeguard these systems. The PSR series offers the “Best-In-Class” dc protection performance available in the market: increased dc voltage compared to the competition (typically 50V to 100V higher than the competition) and increased dc interrupting rating (typically 20kA to 50 kA higher than the competition).

Littelfuse shares extensive technical information on each product’s datasheet to assist the design process.

Unlike the commonly used mechanical turbines used to generate electricity, PV cells generate dc electricity without any moving parts, which makes them low maintenance once they’re installed.

Factors affecting a PV panel’s output power are irradiance (sunlight strength—watts/meter) and ambient temperature. If the irradiance increases, so does the output current. On the flipside, if the irradiance remains constant but the temperature decreases, the output voltage increases. Theoretically, this means the greatest output power comes on a bright, sunny day in the winter.

As with all power systems, overcurrent circuit protection is vital. Optimal protection must be understood and applied properly to provide complete protection to system components and people. This is especially true with PV systems, in which the characteristics and environment can be significantly different than what most electrical designers are used to.

Depending on a PV system’s objectives, there are three basic photovoltaic designs: off grid, grid-tied with battery backup, and grid-tied without battery backup.

A short circuit in an electrical distribution system can be catastrophic, while if a short circuit occurred in a PV panel, it would do no harm to itself.

In the US, PV system voltages typically range from a few volts to 600 VDC, except in utility-scale systems where the voltage can go as high as 1000 VDC.

Regardless of photovoltaic system mentioned, multiple PV modules are typically connected in series and parallel to generate the desired voltage and power output.