NF10AA0121MHB

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Inrush current limiters (ICL) are protective devices that limit the maximum charge current to prevent overload from electrically powered equipment such as motors, starters, transformers, and capacitors. The NF10AA0121MHB is a type of ICL designed to provide surge current protection for appliances and industrial devices.

The NF10AA0121MHB is a fast response current limiting protector that prevents system components from being damaged by excessive current and voltages. The device is designed to have two major components: a thermally controlled varistor and an identical non-thermally controlled varistor. These components provide protection against over-current, over-voltage, and short circuits. The thermal varistor will slow the response time, allowing the electrical current to reach a maximum of 10 A before cutting off. The nonthermally controlled varistor will quickly shutoff power if the current reaches a certain level, preventing any further damage. The two varistors are connected in series and the electrical current is divided by the resistance within the varistors.

Its main application is the protection of motors, transformers, starters, and capacitors against starting current overvoltage. It is also used in other situations where a gradual, accurate, and adjustable limiter is required. The NF10AA0121MHB has a self-protecting temperature spec of 125°C and a rapid response time. This allows it to limit the current to a maximum of 10A. The NF10AA0121MHB is also in compliance with IEC 61439-1.

The working principle of the NF10AA0121MHB is based on the “armour and shield” effect. It works by dividing the current into two paths: the “armoured” path, which passes through the thermally controlled varistor, and the “shield” path, which passes through the nonthermally controlled varistor. The current passing through the thermally controlled varistor is reduced as it reaches certain temperature. The nonthermally controlled varistor shuts off the power when the current reaches a certain level. This allows it to limit the maximum current and truly protect the components.

The NF10AA0121MHB provides reliable over-current and over-voltage protection for various types of electrical equipment. It is especially effective for motors, starters, transformers, and capacitors which often require protection against large load currents. By using the “armour and shield” principle, the NF10AA0121MHB not only provides protection but also ensures that the electrical equipment does not experience any sudden power-off.

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