BST Construction
The BST is an encapsulated pyrotechnic device that is similar to an airbag in operation. The BST contains an ignitor capsule and discharge tube that is mounted in front of the high amperage B+ cable. The B+ cable contains a tapered press fit contact that mounts behind the gas discharge tube.
During activation, the tapered B+ cable contact is forced away from the battery post and held away by spring tabs within the capsule.