Typical applications include protection of semiconductors (diodes, thyristors, triacs, etc) used in power rectifiers, UPS, converters, motor drives, soft starters, solid state relays, photovoltaic inverters, welding inverters and any application where it is necessary to protect semiconductor devices.This may be the an unspeakably stupid question for an electrical/computer engineering student to ask, but I ran across a few parts I didn't recognize (which, after some research, I found out were glass tube fuses and automotive fuses), and they made me wonder.
The lower power dissipation in class gS fuses also result in lower fuse body temperatures. When compared with class gR fuses, gS fuses have lower power dissipation due to tighter melting gate values. Short-circuit protection) for the protection of semiconductors as well as cables and all switchgear of installation. Typical applications include protection of semiconductors (diodes, thyristors, triacs, etc) used in power rectifiers, UPS, converters, motor drives (AC and DC), soft starters, solid state relays, photovoltaic inverters, welding inverters and any application where it is necessary to protect semiconductor devices. Typical applications include protection of semiconductors (diodes, thyristors, triacs, etc) used in power rectifiers, UPS, converters, motor drives (AC and DC), soft starters, solid state relays, photovoltaic inverters, welding inverters and any application where it is necessary to protect semiconductor devices.įull-range breaking capacity (overload and Only) for the protection of Power Semiconductors. Partial-range breaking capacity (short-circuit protection Similar to Slow Acting fuses, a dual element fuse features time delay characteristics, but the multi-element construction provides both high performance short circuit protection and reliable overload protection in circuits subject to temporary overloads and surge currents.
These fuses are designed to accommodate short surges caused by motor start-ups etc.
Slow acting fuses feature a built-in delay that allows temporary and harmless inrush currents to pass without opening the fuse, but the fuse will open on sustained overloads and short circuits. Slow Acting (Slow Blow, Time Delay or Motor Start Fuses) The manufacturer's time current curves are useful in determing the exact speed of a fuse for different overloads. Fast acting fuses are the most common type of fuse. Fast Acting Fuses (Fast Blow, General Purpose or General Application Fuses)įast Acting fuses are designed to protect less sensitive components and are also used to protect cabling from melting or catching fire when an overload occurs. To ensure the device is adequately protected, the I²t value of the fuse must be less than the I²t value of the device the fuse is protecting. It is very important to know the I²t value of the fuse when protecting semiconductor devices. Ultra Rapid fuses primarily provide short circuit protection for semiconductor devices such as diodes, thyristors, transistors etc.Īs they tend to operate at higher temperatures, this often restricts the use of low melting point alloys, thereby providing a limited capability to protect against low over-current conditions. Ultra Rapid Fuses (Very Fast Acting, High Speed, Super Rapid, Ultra Rapid or Semiconductor Fuses)
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