Electronics Safety Forum: Discuss Fuse Types, Symbols & Applications (B10, C10, K10)

I have met with "S" type fuses labeled npS261 B10, or S261 K16 etc. I don't know what the symbols B, K, C, G and maybe some others mean. I request information.

Hi
These letters indicate the characteristics of a given fuse B - fast blow fuse C - slow blow fuse etc.
It is simply for a variety of uses
For example, D or E type fuses are used for the engine because they have a heavy start. There are special boards for this
and the numbers after the letter indicate the rated current.
that is:
S191 B10
Single glass fuse with a current of 10 Amps
S193 C10
Tripple time fuse 10 amps

greetings
GM

Is it possible to ask for a link to the page with these markings? Thanks in advance.

Buddy, get a catalog of any manufacturer, e.g. Fael, and there for each range of fuses are presented the switching characteristics, i.e. In / t

The most common stores and wholesalers include: ETI, FAEL. So: http://www.legrand.pl/ http://www.etipolam.com.pl/index1.htm
The characteristics are selected depending on the protected circuit.
Installations - B, C motors, D transformers, Rectifier systems A.
There is no name fast, slow, because how to call eg S 303 d32 - very, very slow?
Additionally:
S30x - Rated short-circuit capacity 6000 A.
S31x - Rated short-circuit capacity 10,000 A.
S32x - Miniature circuit breakers with high short-circuit capacity of 25,000 A.
the third digit on the circuit breaker (x) indicates the number of modules: 1,2,3,4.
At the end of the markings - the current value.
The matter of selection is therefore based on the foundations of an electric vocational school, supported by a catalog, for example of the companies listed above.

explain that a colleague of the basics of power engineering and fuse characteristics. The type B fuse can withstand a momentary increase in current exceeding a maximum of 5 times the rated value of the cut-off current, c: 10 times, d: 20 times, etc. Of course, this is not a very accurate value because the cut-off current depends on many factors, e.g. ambient temperature etc. The time of switching off each fuse must not exceed 0.2 sec (for voltage 230v and increased humidity) so that the short-circuit current does not exceed the safe voltage - in this case 50V
example: the B16 type fuse can withstand a temporary current of up to 80A, and in the event of an excessive current of approx. 1.45, the switch-off current should operate after approx. 1 hour

G.Matras wrote:

Hi
These letters indicate the characteristics of a given fuse B - fast blow fuse C - slow blow fuse etc.
It is simply for a variety of uses
For example, type D or E fuses are used for the engine because they have a heavy start.
greetings
GM

And since when is E for engines? Unfortunately, it is not the alphabet and the degree of delay that does not increase with the letter.
E is faster than B and is used to protect electronic circuits. Although this type of overcapacity is very rare.
I personally saw this type of "eski" maybe twice in my life.
The engines are B (light starting and low power), C - most and D - heavy starting.
C is also often used in switchgear protection.