ECNR35

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The ECNR35 fuse is a quick-acting non-renewable fuse, specifically designed for photovoltaic (PV) applications. It is one of the most popular of the Renewable Fuse Series from the U.S. National Electrical Manufacturers Association (NEMA). This type of fuse can protect a PV system from overcurrents, which can occur due to accidental wiring connections, short circuits, or lightning strikes. Depending on the application, the ECNR35 fuse can be used as a primary overcurrent protection device or secondary overcurrent protection device.

The ECNR35 fuse is designed with a single action characteristics; meaning that when an overcurrent occurs, the fuse will respond almost instantly. It has an operating time of 0.25 seconds or less. This feature makes the ECNR35 fuse a reliable and safe choice for PV systems. It also ensures that the system is adequately protected from short circuit and overcurrent events.

The working principle of the ECNR35 fuse is based on the Joule’s Law. This law states that the heat produced in a wire is proportional to the square of the current passed through it. When an electrical current is applied to the fuse, it increases the temperature of the wire. This temperature increase eventually causes the wire to break, allowing the current to pass through and be diverted to ground.

The ECNR35 fuse is designed with a watertight construction that ensures safety and superb performance in wet and damp environments. It is also designed with an anti-lock feature that prevents the fuse from operating beyond its defined temperature rating. This prevents the fuse from becoming locked in the closed position, which can ultimately lead to arcing and potentially hazardous conditions. In regard to dimensions, the ECNR35 is slightly larger than its standard counterpart, the ECNR15.

The ECNR35 is an ideal choice for use in high-power, high-voltage PV applications where superior safety and protection is of paramount importance. It is particularly suitable for high-voltage fused disconnects, switch-disconnects, arc-fault circuit interrupters, and transfer switches. The ECNR35 fuse is also capable of providing reliable overcurrent protection in other electrical systems, especially those that are exposed to high temperatures or rugged environments.

In conclusion, the ECNR35 fuse is an effective and reliable safety device designed to protect PV systems from overcurrents and short circuit events. It offers a wide range of features and benefits, including a rapid response time, watertight construction, anti-lock feature, and a high current rating. The ECNR35 is a popular choice in high-power, high-voltage applications, specifically for fused disconnects, switch-disconnects, arc-fault circuit interrupters, and transfer switches.

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