What does the rating of a fuse represent?

The current rating of a fuse is a value expressed in amperes that represents the current the fuse will allow without opening. In other words, if a circuit has a normal current of 10 amperes, a 12.5-ampere fuse will provide overload protection.

What rating should a fuse be?

Working out the best fuse to use Fuses come in standard ratings of 3 A, 5 A or 13 A. The best fuse to use in this example would be the 13A fuse. The 3A and 5A fuses would blow even when the fire was working normally.

What do the letters on fuses mean?

The old military designation always starts with “F,” which stands for fuse. Next, the set of numbers (02) indicates the style. Style means the construction and dimensions (size) of the fuse. Following the style is a letter that represents the voltage rating of the fuse (G).

What are the three ratings for a fuse?

The standard voltage ratings used by fuse manufacturers for most small- dimension and midget fuses are 32, 63, 125, 250 and 600.

What are 2 amp fuses used for?

Fuses are commonly available in the following sizes: 2 Amp: Suitable for up to 480 watts (black markings) and used in low power devices like radios and shavers. 13 Amp: Suitable for up to 3000 watts (brown markings) and used in high current devices such as kettles, toasters and heaters.

Why is there a voltage rating on a fuse?

The voltage rating of a fuse is a function of its capability to open a circuit under an overcurrent condition. Specifically, the voltage rating determines the ability of the fuse to suppress the internal arcing that occurs after a fuse link melts and an arc is produced.

How do I know what amp fuse to use?

The simple calculation is watts divided by volts equals amps. After you have calculated this, it is a simple case of adding around 10% to the value and choosing the nearest fuse to match. This is a more precise method then just guessing should you require a 3, 5, or even 13 amp fuse.

What does gG mean on a fuse?

general purpose fuses
As a first approximation – “gG” are general purpose fuses (i.e. normal ones) and “aM” are “motor” fuses (i.e. ones intended to withstand the startup surges from motors or other similar equipment) – typically providing a higher rated fusewire element within a lower rated cartridge (e.g. 20M25) and often only used to …

What does GMA stand for on a fuse?

Edison general-purpose electronic glass fuses are miniature devices typically used to protect electronic circuits and components. These series of industrial low-voltage fuses, in 1/4 x 1-1/4 inch or 5×20 mm dimensions, offer a selection of features such as fast action and time delay, many in ratings up to 30A.

Does voltage rating matter on a fuse?

Is the voltage rating important? Yes, very important! The voltage rating of the selected fuse must be greater than or equal to the circuit voltage. Since fuses have such low resistance, the voltage rating becomes critical only when the fuse is trying to open.

What happens if you use a higher voltage fuse?

By putting in a higher voltage fuse, it takes more to blow that fuse, which could result in the wires getting hotter/melting/starting on fire. Unless you change the wiring, just leave the voltage of fuses alone and replace a 5v with a 5v.

What’s the voltage rating of a Class CC fuse?

These non-renewable fuses are current-limiting and intended for the protection of components sensitive to short-time overloads, non-inductive loads, and short-circuit protection of motor circuits. Current ratings range from 0A to 30A, and the voltage rating is 600VAC. Class CC fuses are available with DC ratings.

What is the current rating of a non-renewable fuse?

What does the interrupting rating on a fuse mean?

INTERRUPTING RATING:Also known as breaking capacity or short circuit rating, the interrupting rating is the maximum approved current which the fuse can safely interrupt at rated voltage. During a fault or short circuit condition, a fuse may receive an instantaneous overload current many times greater than its normal operating current.

What is the breaking capacity of a fuse?

BREAKING CAPACITY:Also known as interrupting rating or short circuit rating, this is the maximum approved current which the fuse can safely break at rated voltage. Please refer to the INTERRUPTING RATING definition of this section for additional information. CURRENT RATING:The nominal amperage value of the fuse.

What does the current rating on a fuse mean?

CURRENT RATING:The nominal amperage value of the fuse. It is established by the manufacturer as a value of current which the fuse can carry, based on a controlled set of test conditions (See RERATING section). Catalog Fuse part numbers include series identification and amperage ratings.

What should the temperature of a fuse be?

The fuses under discussion are temperature-sensitive devices whose ratings have been established in a 25ºC ambient. The fuse temperature generated by the current passing through the fuse increases or decreases with ambient temperature change.

How long does it take an E rated fuse to melt?

Interrupting ratings range from 50 to 65 kA. E-Rated fuse are UL Listed and operated per ANSI C37.46-2000. Current ratings of 100E amps or less must melt in 300 seconds at 200 to 240% of the E (ampere) rating. Fuses with current ratings over 100E amps must melt in 600 seconds at 220 to 264% of the E (ampere) rating.