@MattiFin sadly you have shown that you are under-informed on the matter. DC systems have used blade switches since 1920+. You can see evidence of this in railway electric traction switchboards (600Vdc 1000A), Electroplating, early telephone exchanges, UPS etc.
However, and this is where your ignorance shows, Electrical power distribution and switch rooms requires operators to be specially trained, equipped full body flash suits, gloves, head googles when operating manual switch gear. There are YT vids to educate you.
On a more domestic note, the vid you showed, deliberately abused circuit breaking for clicks and drama. In reality you wear gloves to protect your hands from flash burns, wear googles to protect your eyes from UV and sparks. Its a moments operation in msecs to pull down a knife switch and the distance of separation immediately quenches the arc flash. For 12V there is no arc flash very minimal risk in auto systems. For 24V you can stick weld but the flash with quench easily within <5mm. 48 volt systems need much larger distances (I estimate 8x ) so proposition is that 50mm is a safe guideline - which I hope to demonstrate in a vid when I get all apparatus together.
Note - dc stick welding is generally ca 20V at work piece (once the arc is struck and in the CC region but starts at ca 60V to strike the arc) and 100-200 A dc. So gloves and face protection is essential but its no great drama.
Ill informed amateurs dont realise a 48V panel system pushes out full current on a sunny day and improper specified breakers may fail to cut the load in a roof fire for example (see vids of mcbs failing including a very popular one in OZ until recently banned
Here is a Vid showing positive support for hypothesis that a large knife switch will work well.
Notice the system is 48v (4 panels) in full sunlight. The arc flash is produced and sustained BUT when the distance is ca 2" it quenches. BTW you can blow the flame out or remove its heat (needed to maintain ionisation temp of ca 6000c by a simple plant mister filled with water.)
I propose also that an immediate arc fire remedy in ELV systems can use a simple plant mist bottle (as well as cable cutters)
However, and this is where your ignorance shows, Electrical power distribution and switch rooms requires operators to be specially trained, equipped full body flash suits, gloves, head googles when operating manual switch gear. There are YT vids to educate you.
On a more domestic note, the vid you showed, deliberately abused circuit breaking for clicks and drama. In reality you wear gloves to protect your hands from flash burns, wear googles to protect your eyes from UV and sparks. Its a moments operation in msecs to pull down a knife switch and the distance of separation immediately quenches the arc flash. For 12V there is no arc flash very minimal risk in auto systems. For 24V you can stick weld but the flash with quench easily within <5mm. 48 volt systems need much larger distances (I estimate 8x ) so proposition is that 50mm is a safe guideline - which I hope to demonstrate in a vid when I get all apparatus together.
Note - dc stick welding is generally ca 20V at work piece (once the arc is struck and in the CC region but starts at ca 60V to strike the arc) and 100-200 A dc. So gloves and face protection is essential but its no great drama.
Ill informed amateurs dont realise a 48V panel system pushes out full current on a sunny day and improper specified breakers may fail to cut the load in a roof fire for example (see vids of mcbs failing including a very popular one in OZ until recently banned
Here is a Vid showing positive support for hypothesis that a large knife switch will work well.
I propose also that an immediate arc fire remedy in ELV systems can use a simple plant mist bottle (as well as cable cutters)