PTCCL11H611DBE

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PTC Resettable Fuses

PTC (positive temperature coefficient) resettable fuses are devices used to protect electrical circuits against overcurrents, preventing any dangerous or damaging scenarios that could result from excessive electrical current. The electrical components themselves are constructed with multiple layers of PTC and a thermistor material, functioning as a two-way switch which reacts quickly to current flow within electronic circuits.

PTCCL11H611DBE application field and working principle

The PTCCL11H611DBE is a low-resistance PTC resettable fuse used to protect low-frequency circuits and devices from over-current. It uses a constructed tube-shaped element that consists of a thermistor dielectric material and several layers of PTC element. The device itself can be configured with different levels of rated current, making it suitable for various switches and relays. The simplest application of the PTCCL11H611DBE involves setting the minimum and maximum trips to protect the circuit from going above its rated current limit.

The PTCCL11H611DBE works by responding to a sudden increase in the current passing through the PTC element, which in turn triggers the other elements in the fuse to heat up and expand. The expanding elements form an impedance that slows the passage of current through the circuit, ultimately protecting it from damage or destruction. When the over-current passes the limit which is pre-set by the circuit, the temperature of the PTC element increases greatly, resulting in the automatic shut off of the circuit. Once the current has dropped back down to the rated value, the PTC element cools down and returns to its original, low-resistance state, allowing the current to resume to normal.

The PTCCL11H611DBE is designed for use in circuits powered by low-frequency alternating current (AC) and direct current (DC). Its main application fields include small switchgear and control gear, including switches, relieves, transformers, batteries, and bypass circuits. The device is easy to install, requires no maintenance, and is more reliable and flexible than traditional resettable fuses.

The combination of PTC thermistor elements and several layers of PTC enables the PTCCL11H611DBE to continuously monitor for sudden changes in the circuit current. It acts as a two-way switch, protecting the circuit during over-currents while also resetting when the current returns to a safe range. This also eliminates the risk of any dangerous scenarios following a sudden power surge or shut down.

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