What are the different types of AC fuses?
- By:Estonian B2b
AC fuses are used in electrical circuits to protect against overcurrent conditions, which could potentially damage equipment or cause electrical hazards. There are several different types of AC fuses available, each designed for specific applications and current ratings. Here are some common types of AC fuses:
1. Cartridge Fuses:
Cartridge fuses are cylindrical fuses with metal end caps. They are available in various sizes and current ratings. Cartridge fuses can be classified into two types: ferrule-type fuses and knife-blade fuses. Ferrule-type fuses have a metal cap on each end, while knife-blade fuses have flat metal blades for connection. These fuses are typically used in industrial and residential applications.
2. Blade Fuses:
Blade fuses, also known as automotive fuses, are widely used in vehicles to protect the electrical circuits. They have a plastic body with two metal blades for connection. Blade fuses come in different current ratings and are color-coded for easy identification. They are commonly found in cars, trucks, motorcycles, and other automotive applications.
3. Resettable Fuses:
Resettable fuses, also known as polymeric positive temperature coefficient (PPTC) fuses or thermal cutoffs, are designed to automatically reset after a fault condition is cleared. These fuses use a thermally sensitive polymer material that exhibits a high resistance when normal operating current flows through it. If the current exceeds a certain threshold, the polymer heats up and its resistance increases, limiting the current flow. Once the fault is removed and the polymer cools down, the resistance returns to its low state. Resettable fuses are often used in electronic devices, computer power supplies, and telecommunications equipment.
4. SMD Fuses:
Surface Mount Device (SMD) fuses are small-sized fuses designed for surface mount technology (SMT) applications on printed circuit boards (PCBs). They are soldered directly onto the PCB, eliminating the need for through-hole mounting. SMD fuses are commonly used in electronics, including consumer electronics, telecommunications devices, and automotive electronics.
5. High Voltage Fuses:
High voltage fuses are designed for applications with high voltage levels, such as utility power distribution systems and electrical substations. These fuses are capable of interrupting high fault currents and are built to withstand high voltage levels. High voltage fuses can be of various types, including expulsion fuses, current-limiting fuses, and power fuses.
6. Semiconductor Fuses:
Semiconductor fuses, also known as semiconductor protection fuses, are specifically designed to protect semiconductor devices, such as diodes, thyristors, and insulated gate bipolar transistors (IGBTs). These fuses have precise current and voltage ratings to protect the sensitive semiconductor components from overcurrent and short-circuit conditions.
These are some of the commonly used types of AC fuses. The selection of the appropriate fuse type depends on factors such as the application, voltage rating, current rating, response time, and required protection level. It is important to consult the relevant standards and guidelines, and consider the specific requirements of the circuit when choosing a fuse.