3 pole would be for 3 phase, 4 pole would be 3 phase & neutral
circuit breakers are connected in series manner in the circuit.
A vacuum breaker uses a vacuum to extinguish the arc when interrupting a circuit, while a SF6 gas circuit breaker uses sulfur hexafluoride gas. SF6 gas circuit breakers can handle higher voltages and currents compared to vacuum breakers. SF6 gas circuit breakers are also more environmentally harmful due to the greenhouse gas SF6, while vacuum breakers are considered more eco-friendly.
SION Vacuum Circuit-Breaker
SF6 circuit breaker
what is the difference between miniature circuit breaker and fuse
"Air" and "Vacuum" describe how the breaker extinguishes the arcing current. An Air breaker opens far enough that the dielectric strenght of air is enough to extinguish the arc. A vacuum breaker's contacts are in a vacuum. Oil breakers use oil. SF6 breakers use SF6 gas to extinguish the arc.
The breaker panel.
The breaker panel.
Tandem breakers, often called split breakers or double breakers, provide two separate circuits in the space of a regular sized breaker opening. Every circuit breaker panel has a limited number of circuit openings available. The problem is that when the openings are all used up and you still need to add another circuit, what do you do? You could change the electrical panel or double up circuits on a breaker, but this could place too much load on a particular circuit. So what then? The answer that many have found is a tandem breaker. This type breaker is the same size as any other breaker, but it has its difference. This breaker sports two smaller breakers built into one regular sized breaker. Each has its own breaker switch and the breaker snaps in just like a regular breaker. With this simple innovation, you can add a circuit and protect the circuit on its own dedicated line.
Draw-out and fixed-air circuit breakers are both types of circuit breakers used in electrical systems. The main difference between them is how they are installed and removed from the system. A draw-out circuit breaker can be easily removed from its housing for maintenance or replacement without disrupting the electrical connections. On the other hand, a fixed-air circuit breaker is permanently installed in the system and cannot be easily removed without disconnecting the electrical connections. Draw-out circuit breakers are commonly used in critical applications where downtime must be minimized, while fixed-air circuit breakers are more suitable for applications where frequent removal is not necessary.
The electrical terminology for this type of breaker is a tandem breaker. It is where two breakers circuits can be in the same one breaker slot in a distribution panel. On this type of breaker there will be two output for a circuit value of what ever the breaker is rated for.
Most automotive circuit breakers reset themselves after they cool off. Some bigger trucks use circuit breakers that are reset manually. They have a button you push in to reset the breaker after it has cooled off.