Features: Single-pole SPD Iimp = 100kA Imax = 160kA High Energy GDT Compact Housing Product summary: The PROTUBE BS is an over voltage surge protective device and has been developed to protect against partial direct and indirect lightning discharges and is intended to provide protection in zones 0A - 1 as per IEC 62305.It consists of an encapsulated air gap device (GDT), and is used as a galvanic separation between the N-PE conductors in a 1+1 or 3 1 power distribution system (TT networks).