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What is the difference between type 1 & type 2 SF circuit breaker.

The type 1 & type 2 SF circuit breaker has the below differences
 
- Poles are different (you can see upper insert T1 with one hole and T2 with two hole)
- Pressure of SF6 gas is different.
 
For SF1 Type 1: Means the pressure inside poles is 0,5 bar which means the capacity of SF CB if applicable for max. 630A.
 
For SF1 Type 2: The pressure is 2 bar which means the capacity of SF CB is max. 1250A.
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