An elbow arrester is a type of surge arrester, likely used in electrical power systems, designed to protect equipment from voltage surges. In the event of a failure, the design ensures it fires out as one piece to prevent individual components from ejecting through the sidewall.
The provided reference material suggests a focus on safety and adherence to industry standards like IEEE 386. The primary function seems to be to protect equipment by diverting excess voltage, while the specific design minimizes potential hazards associated with failure, containing the explosive force in a single, directed ejection.