ASMD185F-2 Circuit Protection

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PTC resettable fuses, a type of passive electronic component, are also known as polymeric positive temperature coefficient (PPTC) devices or polyfuses. These resettable fuses are characterized in that the device will open once its rated current is exceeded, and no reset operation is necessary. PTC resettable fuses provide an automatic and reliable overcurrent protection. Used in applications since the mid 1980s, PTC resettable fuses have been increasingly popular due to their compact size, low cost, and excellent performance.

ASMD185F-2 is a type of PTC resettable fuse manufactured by EPCOS/TDK. This device provides very low resistance and increased current protection against overcurrents in consumer and industrial electronic circuitry. As rated 140VAC/200VDC, the ASMD185F-2 is a self-resetting, solid-state fuse with a very low quenching current of 1mA at 70°C and a maximum current consistent with its I2t rating. As a result, the ASMD185F-2 provides protection of both consumer and industrial electronic circuits against damage caused by brief overcurrents.

The primary application field for the ASMD185F-2 is in consumer and industrial circuits, such as those used in charging power supplies, power supplies, automotive electrical systems, motor controllers, personal computers, distributed power supplies, small servo motors, and home and office appliances. The ASMD185F-2 is also suitable for protecting connected LED modules in industrial electrical equipment, where a high I2t value is required. In addition, ASMD185F-2 is also widely used in detecting electrical arcs and other current fault in various industries.

In terms of working principle, the ASMD185F-2 acts as an overcurrent detection device. When the current reaching the fuse exceeds the rated value, the temperature of the fuse element increases. Once the operating temperature is reached, the device switches from a low-resistance to a high-resistance state, thus restricting the current flow. This state will automatically reset once the current drops below the resettable level. In addition, the ASMD185F-2 also has a time-delay function which ensures that the device remains in a high-resistance state even after the overcurrent has subsided, thus preventing a momentary overload following on from the overcurrent condition. When the temperature falls below the operating point the device automatically returns to its low-resistance state.

In conclusion, ASMD185F-2 is a type of PTC resettable fuses designed to provide an automatic and reliable overcurrent protection. As rated 140VAC/200VDC, this fuse has a very low quenching current of 1mA at 70°C, and can be used in consumer and industrial applications, including charging power supplies, power supplies, automotive electrical systems, motor controllers, personal computers, distributed power supplies, small servo motors, and home and office appliances. The ASMD185F-2 acts as an overcurrent detection device, and it switches from a low-resistance to a high-resistance state, thus restricting the current flow when the current reaching the fuse exceeds the rated value. This state will automatically reset once the current drops below the resettable level.

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