Boron
Member
- Joined
- Nov 22, 2023
- Messages
- 140
Ive seen a lot of hype about dc high current circuit breakers and the controversy over polarised (with internal arc deflecting permanent magnet) and the non polarised version which uses the load current to power a shunt coil to produce the magnetic field to repel the arc into the quench chamber - see pix
This type shows that it has an over-current trip to break the circuit (like an mcb)
What puzzles me is whether this load current passing through the trip coil is sufficient to make a magnetic repelling field strong enough when the breaker is manually tripped at say 10,20,50% of full load trip current?
Ive seen vids where a sustained arc flash can be created at contact point with a 5mm separation at 24V and 10A
Does anyone know?, do they manually break a live circuit at low load currents safely without damage?
There is a type of rotary isolating switch as well which claim internal arc suppression and appear to be the only approved type for PV ccts in OZ https://www.zjbenydc.com/Content/upload/pdf/202017379/1000V-DC-Isolator-BYH-32-Datasheet.pdf?rnd=713
Note there are a lot of fake utter dangerous junk versions on Ebay Alix. Why Govs allow these to be sold is criminally negligent IMHO
I havent got hold of a zjbeny one ( must import from OZ to UK? not available from PRC to personal customers ). Would cost me ca £100. So I dont know whats inside.
I also havent got copies of their certifications to AS6097 - very shy about this ???????????
This type shows that it has an over-current trip to break the circuit (like an mcb)
What puzzles me is whether this load current passing through the trip coil is sufficient to make a magnetic repelling field strong enough when the breaker is manually tripped at say 10,20,50% of full load trip current?
Ive seen vids where a sustained arc flash can be created at contact point with a 5mm separation at 24V and 10A
Does anyone know?, do they manually break a live circuit at low load currents safely without damage?
There is a type of rotary isolating switch as well which claim internal arc suppression and appear to be the only approved type for PV ccts in OZ https://www.zjbenydc.com/Content/upload/pdf/202017379/1000V-DC-Isolator-BYH-32-Datasheet.pdf?rnd=713
Note there are a lot of fake utter dangerous junk versions on Ebay Alix. Why Govs allow these to be sold is criminally negligent IMHO
I havent got hold of a zjbeny one ( must import from OZ to UK? not available from PRC to personal customers ). Would cost me ca £100. So I dont know whats inside.
I also havent got copies of their certifications to AS6097 - very shy about this ???????????
Attachments
Last edited: