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. This part of IEC 61643 ?C deals with GDTs having two or three electrodes; ?C does not deal with mountings and their effect on GDT characteristics. Characteristics given apply solely to GDTs mounted in the ways described for the tests; ?C does not deal with mechanical dimensions; ?C does not deal with quality assurance requirements; ?C may not be sufficient for GDTs used on high-frequency or multi-channel systems; ?C does not deal with electrostatic voltages; ?C does not deal with GDTs connected in series with voltage-dependent resistors in order to limit follow-on currents in electrical power systems; ?C does not deal with hybrid or composite GDT devices.
IEC 61643-311:2001 history
2013IEC 61643-311:2013 Components for low-voltage surge protective devices - Part 311: Performance requirements and test circuits for gas discharge tubes (GDT)
2001IEC 61643-311:2001 Components for Low-Voltage Surge Protective Devices - Part 311: Specification for Gas Discharge Tubes (GDT) (Edition 1.0)