What does fuse HRC mean and what do fuse parameters mean?

Fuse HRC: Current limiting fuse, also known as HRC fule, high rupturing capacity fuse.

A current-limiting fuse is a type of high-voltage fuse. The current limiting fuse is divided into resistance current limiting and arc reactance conversion current limiting. A current-limiting fuse is a fuse that can safely cut off all possible currents within its rated and current-limiting ranges.

It limits the fusing time at the rated voltage to a period equal to or less than the first mainstream wave or symmetrical current wave, while limiting the passing current to less than the peak current.

Hardness (HRC) - is the ability of a material to resist penetration by foreign objects.

The most common way to test the hardness of steel is to file the edge of the workpiece with a file, and the hardness is determined by the depth of the scratch marks on its surface. This method is called the file method, and this method is less scientific.

The hardness tester is extremely accurate and is a common method for testing hardness in modern times.

The most commonly used test method is the Rockwell hardness testRockwell hardness testing machine uses the depth of the diamond into the metal to determine the hardness of the metal, the greater the depth of the punch, the smaller the hardness.

Rockwell hardness, which was proposed by Rockwell in 1921, is the hardness value of a metal material measured using a Rockwell hardness tester. The value has no unit, only the code "HR" is indicated, and its measurement method is to press the steel ball or diamond indenter vertically into the surface of the material to be tested under the specified applied load, resulting in a dent, according to the depth of the dent after the load is released, the Rockwell hardness can be calculated by using the Rockwell hardness calculation formula hr=(k-h) c. The Rockwell hardness value is displayed on the dial of the hardness tester and can be read directly.

In the above formula, k is a constant, k= when the diamond indenter, and k= when the steel ball indenter is quenched; h is the indentation depth of the specimen after the main load is removed; c is also a constant, and in general c=. It can be seen from this that the shallower the indentation, the greater the HR value and the higher the hardness of the material. Generally, the code names HRA, HRB, HRC are used to represent the hardness of the material, in which HRA indicates that the test load is tested by a diamond cone indenter with a top angle of 120 degrees; HRB indicates that the test load is tested using a quenched steel ball with a diameter; HRC indicates that the test load is tested using a diamond cone head with a top angle of 120 degrees.

For the hardness of the knife making material, the knife making world generally uses HRC to express the hardness of the blade, such as HRC60, which means that the indentation depth of the test material is when the test load is the use of a diamond cone indenter with a top angle of 120 degrees.

The depth at which the diamond has penetrated into the metal, indicating the correct number from the pointer, is called the Rockwell number.

Generally, the edge hardness of a good knife should be above 50hrc and below 60hrc.

In short, the higher the hardness, the higher the wear resistance, but the greater the brittleness. The maximum hardness is not more than 60hrc

A fuse is an electronic component used to protect the circuit, which can disconnect the stuffy circuit when the circuit is overcurrent or overloaded, and prevent safety accidents such as circuit damage or fire. Here are some common meanings of fuse parameters:

Rated Current: The maximum current that the fuse can withstand, usually measured in amps (A).

Breaking Capacity: The maximum current that the fuse is able to cut off, usually measured in amperes (a).

Operating temperature: The temperature range at which the fuse can operate normally.

Blow speed: The speed at which the fuse disconnects the circuit, which is usually divided into fast fuse and slow fuse.

Fuse material: The material of the fuse fuse is usually glass fiber, ceramic, copper and other materials.

Rated Voltage: The maximum voltage that the fuse can withstand in volts (V).

Fuse Model: The model and specification of the fuse, usually identified on the fuse housing.

Different combinations of these parameters can meet the protection needs of different circuits. When selecting a fuse, the type and specification of the fuse should be determined according to the rated current, rated voltage, working environment and other factors of the circuit.