RXEF040

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PTC Resettable Fuses are an important type of circuit breaker which are used to prevent high currents from damaging electronic circuits. The RXEF040 is a small, surface-mounted resettable fuse that is designed for use in automotive applications. It provides a simple and effective way of protecting circuits from over-currents and short circuits.

The RXEF040 is composed of a glass-filled epoxy body that contains two sensitive bimetallic strips. A typical application circuit for the RXEF040 is shown in Figure 1 below. When a current passes through the PTC resettable fuse, the bimetallic strips heat up and bend. The bending causes a sudden interruption in the current path, which results in the circuit being turned off. At this point, the PTC resettable fuse has reset itself and is ready to be re-used.

The RXEF040 is an economical and reliable solution for automotive applications where short circuit protection is required. It is designed to handle up to 4 Amps of current which makes it well suited for a variety of automotive applications. The fuse also has a low voltage rating, which means that it can be used in circuits with low voltage power supplies. Additionally, the fuse is designed to be used in environments where temperature variations may occur, such as in engine compartments or trunks.

The RXEF040 works by detecting and interrupting excessive current flow in a circuit. Once the current reaches a certain threshold, the bimetallic strips heat up and bend, thus interrupting the current flow. This interruption results in the circuit being safely turned off. It is important to note that the RXEF040 is a one-time-use fuse that cannot be reset. The fuse must be replaced after it has tripped.

In summary, the RXEF040 is a small, surface-mounted PTC resettable fuse that is designed for automotive applications. It is designed to handle up to 4 Amps of current and can be used in environments with temperature variations. The fuse works by detecting excessive current flow, interrupting it, and turning off the circuit. The fuse is intended for single-use and must be replaced after it has tripped.

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