A slow blow fuse, also known as a time-delay fuse, is designed to withstand temporary surges in current without blowing. It has a heat-sensitive element that heats up slowly, allowing it to tolerate short bursts of higher current, such as those caused by motor startups or inrush currents. Once the current exceeds a certain threshold for an extended period, the element heats up sufficiently to melt and break the circuit, thus protecting the electrical system from sustained overloads. This feature makes slow blow fuses ideal for applications with intermittent high current demands.
It depends on the precise type of slow blow fuse, but in general terms a fuse with a slow blow characteristic will take longer to operate (blow) at high overload currents than one with a normal characteristic. For low overload currents it will operate in about the same time as a normal fuse.
If the fuse is labelled F it is fast-blow or T OR S it is slow-blow, the letter should be on the metal cap on the ends of the fuse.
The fast blow fuse will generally only have a straight wire between the terminals, while the slow blow version will have part of that wire coiled up as a spring.
another name could be "dual-element fuse" as these are the slow-blow type.
The time it takes for a fuse to blow, either "fast blow" or "slow blow" is determined by the design of the fuse and is described in a table or graph provided by the manufacturer. In general, the higher the applied overload current, the faster the fuse will blow. Fast blow fuses can open in milliseconds, slow blow fuses can open in several seconds. The fuse used depends entirely on the application and what kind of circuit it is protecting.
slow
Slow burning fuse usually to alot time to evacuate an area
Any piece of machinery that is designed to use a fast blow fuse should only use a fast blow fuse. For safety reasons this could save your life instead of taking it.
Cotton candy machines typically use a slow blow fuse. This type of fuse can handle brief surges in current, which are common during the machine's startup, without blowing. A fast blow fuse, on the other hand, would be more likely to trip under these conditions, potentially interrupting the operation of the machine.
A low break capacity fuse typically refers to its ability to interrupt a circuit at lower fault currents, but it does not directly indicate whether it is fast or slow blow. Fast-blow fuses are designed to react quickly to overcurrents, while slow-blow fuses can tolerate temporary surges without blowing. The break capacity and the blow speed are separate characteristics, so a low break capacity fuse can be either fast or slow blow depending on its design.
To change a slow blow fuse in a male plug, first ensure the power is turned off and unplug the device. Use a screwdriver to remove the cover of the plug, then carefully extract the old fuse. Replace it with a new slow blow fuse of the same rating, ensuring it fits securely. Finally, reassemble the plug cover and plug the device back in to test its functionality.
It should be a 1.25 amp (1250ma) "slow-blow" fuse.