CITEL BB series surge arresters are ceramic gas discharge tubes designed to protect telecommunication and data transmission equipment against transient caused by industrial over-voltages and lightnings. It is basically a 2-electrode GDT built in compliance with international standards.
It is not radioactive and is used as connection blocks, holders and in PCB mounting. They come in numerous varieties to suit different customer need. The Nominal discharge current 15 x 8/20 µs impulses is 10kA and maximal discharge current is 25kA. It offers Insulation resistance of >10 GOhms.