PTCCL07H321DBE

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PTC resettable fuses are devices that are commonly used in automotive and automotive-related industries. They contain a semiconductor element with a ceramic enclosure, and offer protection against overcurrents, short circuits, and voltage spikes. The PTC resettable fuse, model PTCCL07H321DBE, is a PTC fuse with a unique structure that contains an electrothermal bimetallic element. This element is designed to trip at a certain overcurrent threshold and then reset itself after the current is removed.

The PTCCL07H321DBE is specifically designed for vehicle fuse boxes. It is a drive-activated, resettable fuse with a voltage rating of 12V and a current rating of 32A. This fuse is applicable to both 6mm x 32mm and 6mm x 25mm box sizes. It has a nominal hold current of 21A and a trip current of 0.06A to 5A. Its trip time corresponds to 0.34 seconds at 5A and 144 seconds at 0.3A. The PTCCL07H321DBE’s maximum interrupt current is 1,500A.

The PTCCL07H321DBE offers long over-current protection. Its component magnetic heating bimetallic structure contributes towards its high current stability. Its non-ohmic type wiring ensures that it can be used in different wiring types, maximising its application flexibility. Its working principle is based on an electrothermal bimetallic element, which can be divided into five stages, each marked by a sustained change in resistance.

In the first stage, no current flows and the bimetal remains in the cold contact position. This position guarantees high contact reliability. When the current reaches a certain critical level, the bimetal heats up, leading to the resistance between the contacts increasing and the current dropping. In the second stage, the current further decreases, and the bimetal is in the thermal contact position. In the third stage, the non-ohmic contact forms a current flow. In the fourth stage, the current flow remains steady. In the fifth and last stage, the current reaches a critical level and the bimetal is heated even further, causing it to trip and break the circuit.

The PTCCL07H321DBE is commonly used in automotive circuits, power control systems, automotive fuse boxes, battery packs, and energy management systems. It can be used to control and prevent overcurrents, short circuiting, and voltage spikes, and is especially suitable for 12V vehicles with a maximum current rating of 32A. This resettable fuse offers the same protection as a regular fuse, with the added benefit of requiring no replacement once it trips.

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