MF-SM185/33-2

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PTC Resettable Fuses use a PTC thermistor to protect sensitive circuitry from current overloads. This technology works by detecting an excessive current load on the circuit and then cutting off the power to that circuit until the fault condition has been cleared and the circuit reset. MF-SM185/33-2 is a barrel type PTC resettable fuse developed by MF-Semiconductor for use in industrial and household electrical applications. The fuse is a single-element, small diameter, polymeric positive temperature (PTC) thermal device that provides reliable overcurrent protection.

Features & Benefits

• Low insertion force design for easier installation
• High current interruption capability
• Small size and high capacity
• Temperature range between −40 °C to 105 °C
• Faster Resettable response time
• Over current protection with automatic reset
• Large load power reset cooperativity

Applications

• Automotive Fuse
• DC/DC Converters
• Cellular Phones
• Power Supplies
• Radar/Sonar Systems
• Battery & SuperCap Chargers
• Air Conditioners
• Ventilators
• LED Drivers
• Large Household Appliances

Working Principle

The MF-SM185/33-2 working principle is based on the PTC Resettable Fuse technology, which senses the current level and then initiates a self-reset process in case of an overcurrent event. In terms of operation, the MF-SM185/33-2 will begin by providing normal current flow until a certain overcurrent limit is detected. Once this limit has been reached it will short circuit and bring the current flow to zero, thus protecting the device connected to it from any potential harm from the overcurrent condition.

Once the overcurrent has been cleared, the MF-SM185/33-2 will automatically attempt a self-reset, in which the PTC component will gradually reform its original shape. This process can take up to two seconds depending on the conditions, after which the MF-SM185/33-2 will provide a continuous current flow again until it is subjected to another overload.

Conclusion

MF-SM185/33-2 is an innovative PTC Resettable Fuse designed specifically for industrial and household electrical applications that need reliable overcurrent protection. The fuse utilizes a special thermistor material that responds quickly to detect and stop an overcurrent event and then self-resets itself to provide a continuous current flow again. It is a great solution for a wide range of applications due to its small size, high capacity, and fast response time.

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