RHEF600-2 Circuit Protection

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PTC Resettable Fuses are passive components that utilize a combination of electrical, thermal and mechanical properties to form an electrical fuse. Among them, the RHEF600-2 is a versatile PTC resettable fuse, particularly designed for the consumer and consumer-related applications. It can render its intended functions of over-current protection, over-heating protection, inrush current protection and ESD protection, in a variety of configurations.

The RHEF600-2 uses a polymeric Positive Temperature Coefficient (PTC) element that functions as a current-limiting device. When operating current is none to low, the PTC is non-conducting, providing disable the circuit. At higher operating currents the PTC is driven to its tempering limit, forcing the element to go into an overload condition that causes it to degenerate into a resistive or semi-conductive state. This limits the current in the event of an over-current condition, providing the desired protection from fire, excessive power, and electrical shock.

The working principle of the RHEF600-2 is quite simple yet efficient. This PTC resettable fuse features a non-linear or increased impedance behavior during sustained current which is greater than the rated current. This behavior helps to limit the load current and functions as a fuse that can ‘‘blow’’ in case of an over-current condition. Once the current is stopped, the resistor returns back to its non-conductive state, ready to be used again.

One of the key advantages of the RHEF600-2 is its wide application field. This PTC resettable fuse is primarily used in applications that require reliable protection from over-current, over-heating, inrush current and ESD protection. Such applications involve but are not limited to AC-DC converters, AC and DC line protection, HVAC, RCD, gas detectors, ventilation systems, household appliances, computer and peripherals, telecom equipment, and numerous others.

In some applications, RHEF600-2 can also be utilized to provide back-up protection for a circuit as well as for end-user safety. For instance, it can be used in serious applications such as medical life-support equipment to protect from inrush currents, thus ensuring that no patient is exposed to an unsafe voltage. Furthermore, this PTC resettable fuse can be used to protect Human Machine Interfaces (HMIs), providing end-user safety since it does not need to be replaced after activation.

In conclusion, the RHEF600-2 is a reliable PTC resettable fuse perfectly suitable for applications that require over-current, over-heating, inrush current, or ESD protection. It offers a simple yet efficient working principle and a wide application field that includes medical life-support equipment and Human Machine Interfaces (HMIs).

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