GMA-3A

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The GMA-3A is a time-delay AC and DC fuse designed for protection against overload or short-circuits on photovoltaic (PV) systems, electric combiners, feeders, and branch circuits in solar power systems. This fuse is part of the GMA range of products from Eaton, a multinational power management company. GMA-3A fuses are UL listed for 600v applications and have a range of current ratings from 10 amps to 20 amps.

The key feature of GMA-3A fuses is their adjustable time-delay. This allows the user to select the fuse\'s reaction time in the event of an overload or short-circuit to protect the system from damage. The time-delay of the fuse can be adjusted by rotating the knob on the top of the fuse body. The fuse has three settings: 5 minutes, 10 minutes, and 30 minutes.

In addition to adjustable time-delay, GMA-3A fuses have several other important safety features. The fuse body is constructed from high-quality ceramic that is resistant to high temperature and vibration. This protects the fuse elements and minimizes arcing during fault conditions. Furthermore, the fuse employs an arc extinguishing mechanism that reduces arcing and safely clears a fault within a few milliseconds.

The working principle of GMA-3A fuses is simple. When an electrical current exceeds the rated value or a short-circuit occurs, the fuse element is heated and molten material is expelled. This opens the circuit and protects the system from damage. When the fault is cleared, the melted material cools and re-solidifies, creating an air gap within the fuse element. This restores normal circuit operation and allows the system to continue functioning without interruption.

As mentioned earlier, GMA-3A fuses are used for protection in PV systems, electric combiners, feeders, and branch circuits. They are also used in industrial, off-grid applications such as stand-alone solar pumped storage systems, industrial process systems, and marine/offshore systems. These fuses are UL listed and have been tested to meet a variety of international standards.

GMA-3A fuses offer reliable and adjustable protection for solar power systems and other applications. With their adjustable time-delay and other safety features, they provide reliable circuit protection and help prevent damage and downtime.

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