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Overview of safety devices

Overview of safety devices

The fuse device mainly includes various fuses, temperature fuses, fuse resistors and recoverable fuses. In the circuit, it mainly protects against overcurrent, overvoltage and overtemperature. Common fuses (FUSE), also known as current fuses and fuses, are one of the most commonly used one-time protection devices. They are used to automatically cut off power when electronic devices and circuits over-current for some reason, to “sacrifice” The relevant components in the self-protection circuit are protected from damage.

Since Edison invented the first plug-type fuse that encloses thin wires in the lamp holder in the 1890s, the types of fuses have become more and more widely used. Nowadays, various types of insurance devices have been widely used in various electronic devices, becoming a veritable “security guard” and “protective god” in various electronic devices and circuits.

Structure and principle

Although the commonly used insurance devices are various and varied, the basic components are different, but they work in much the same way. No matter which kind of fuse device, in order to effectively protect the short circuit and overload of the electronic device or circuit, it must be connected in series in the protected circuit in practical applications. If it is applied in the 220V AC circuit, it should usually be emphasized. Priority is connected in series at the input of the power phase line. In this way, when the circuit or electronic device is working normally, the fuse device is equivalent to a wire, and has no effect on the circuit; when the circuit or electronic device is short-circuited or overloaded, the current flowing through the fuse device will increase sharply, and the well exceeds its rated value. The working current causes the fuse (or other material) of the fuse to rapidly heat up and blow, thereby automatically cutting off the working power, effectively protecting the circuit and electronic equipment, and preventing the fault from expanding.

Since the protection of the general fuse is at the expense of “sacrifice itself”, it is a one-off device (also known as a non-recoverable fuse), so once the fuse is “blown”, the new equivalent must be replaced after the circuit fault is removed. Insurance device.

The above is the structure of the SMT processing plant to share the components of electronic products. If you need more information about the industry, please pay attention to us.

5月-28-2019

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