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Nie, dziękuję Przekieruj mnie tamAkrzy74 wrote:There are special overcurrent circuit breakers marked DC for DC circuits.
E.g. FAZ-C25/1-DC by MOELLER
niutat wrote:Which the more. When circuit breakers designed for higher voltage are used in installations with lower voltage, we can expect higher overvoltages during the breaking time.Łukasz-O wrote:Looking just at the quick in the Legrand catalog, the S 300 series is also suitable for DC.
Especially since it's only 24V.
niutat wrote:Exactly what you wrote. Fast arc extinction results in more overvoltage. In practice, the overvoltage value expressed in [V] will be the same as in the 230V network, but the lower voltage installation does not always provide for this.As for the AC circuits, it is obviously easier to extinguish the arc with a lower voltage (although colleague WojcikW has some new theories) ...
niutat wrote:And I'm not going to.You still haven't convinced me...
Quote:I'm more interested in whether, for example, such a single "Eska" B10
will work at DC 10A, are the current characteristics the same then?
Ryszard49 wrote:
I was testing with 10B and 40V DC. With a load of 20A, the fuse did not work, I ended the test because I had no way to increase the load in the circuit. It worked when it was short-circuited.
Ryszard49 wrote:
I was testing with 10B and 40V DC. With a load of 20A, the fuse did not work, I ended the test because I had no way to increase the load in the circuit. When short circuited, it worked.
Aleksander_01 wrote:Gentlemen, after all, the fuse does not see the voltage, the phase shift only sees the current (effective) value. As for the voltage - the manufacturer guarantees certain extinction of the arc up to the value of this voltage.
Aleksander_01 wrote:Nonsense.
And more conclusions - calmly and without fear, overcurrent fuses, e.g. S191 B10, can be mounted to DC installations up to the voltage value given on the fuse. After all, that's what it was made for.
niutat wrote:As for switching off the DC current, of course, there are bigger problems with it, especially if the load is inductive (tables, couplings, etc.). for comparison, I will give data from the TSM-2 contactor for 220V AC max. switched off power is 7.5kW but for DC it is only 3.5kW. As for the characteristics, in my opinion, with direct current, the protection will work at a lower current value.
Aleksander_01 wrote:Aleksander_01 saw something, but he doesn't know what, anyway identical on the 230V AC and 24V DC side. I don't know why Aleksander_01 doesn't read earlier posts and then jumps out like Filip from hemp - what he didn't see while working in the industry. If he saw the fuse-links, the manufacturer specifies that they can work in a DC installation (for DC, the maximum operating voltage is usually lower than for AC). If he saw installation switches, it was written that ordinary eSek operation up to 24V DC voltage is allowed. In general, ordinary eSek cannot be used in DC installations, however, in some low-power sources, the sources will work properly and such application in practice cannot be ruled out. If ordinary eSki could be used in DC installations, the manufacturer would not fail to write it. There would also be no need to produce eSek DC.Working in the industry, I had contact with modern machines of German and French production (machine production year 2000 to 2002), and in these machines on the primary side (230, 400 V) identical fuses were used as on the secondary side (24 VDC).
But we know that countries such as Germany or France are total backwardness and do not know about the variable characteristics of fuses, I also learned from WojcikW today. Of course, the fuse distinguishes the phase shift (I wonder what else it can do).
As many fuses as there are types of electricity.
chudy0283 wrote:
However, here the breaking capacity is lower for DC current, in contrast to electromagnetic circuit breakers
Please explain more.
TL;DR: For low-power 24 V DC control loops, DC-rated miniature circuit breakers with 6 kA breaking capacity clear faults up to three times faster, yet “ordinary 230 V ‘eski’ only cleared a dead-short at 20 A” [Elektroda, Ryszard49, post #6337952] Why it matters: Selecting the wrong breaker can leave 24 V supplies unprotected, weld contacts, and void CE marking for machines.
• Legrand S302-D: 24 V DC max, 6 kA breaking capacity, curve D [Elektroda, HeSz, post #6338649] • Eaton FAZ-DC series: 60 V DC (1-pole) or 220 V DC (2-pole), 15 kA at 60 V [Eaton, 2022 Cat.]. • Schneider C60H-DC: 250 V DC (1-pole), 10 kA breaking capacity [Schneider, 2023 Cat.]. • AC MCB trip delay rises ≈100 % on DC due to absent zero-crossing [Elektroda, Anonymous, post #6340517] • B10 test: 20 A at 40 V DC produced no trip for several minutes [Elektroda, Ryszard49, post #6337952]
