BS EN 61643-311:2001

This standard BS EN 61643-311:2001 Low voltage surge protective devices is classified in these ICS categories:

• 33.040.99 Other equipment for telecommunication systems
• 31.100 Electronic tubes
• 33.040.30 Switching and signalling systems
• 29.120.50 Fuses and other overcurrent protection devices

Gas discharge tubes (GDTs) are used for applications up to 1 000 V a.c. or 1 500 V d.c. in communication or signalling circuits. They are defined as a gap, or series of gaps, in an enclosed discharge medium other than air. They are designed to protect apparatus or personnel, or both, from high transient voltages. This standard does not specify requirements applicable to complete surge protective devices, nor does it specify total requirements for GDTs employed within electronic devices, where precise coordination between GDT performance and surge protective device withstand capability is highly critical.