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Live Tank Circuit Breakers Buyer's Guide - Section LTB family· PDF fileGas pressure inside the Auto-Puffer™ volume continues to increase and a certain pressure it is high enough to force the Auto-Puffer™ valve to the closed position. All SF 6 gas required for interruption is now trapped in the fixed Auto-Puffer™ volume and any further increase in gas pressure in that volume is due solely to heating from the arc.

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