scope:

Thyristor surge protective components (SPCs) are specially formulated thyristors designed to limit overvoltages and divert surge currents by clamping and switching actions. This Recommendation applies to fixed-voltage thyristor overvoltage SPCs used in surge protective devices (SPDs) and telecommunications equipment ports to provide overvoltage protection for installations during lightning surges and AC power faults, in accordance with [b-ITU-T K.11]. Telecommunications equipment port test levels and criterion are defined by [b-ITU-T K.20], [b-ITU-T K.21] and [b-ITU-T K.45], as appropriate and are supported by [b-ITU-T K.44] with test circuit details and application guidance.

This Recommendation covers fixed-voltage thyristor SPCs with a switching characteristic in the first quadrant and a switching or blocking or conducting characteristic in the third quadrant. This Recommendation contains information on:

a) terminology;

b) letter and circuit symbols;

c) essential electrical ratings and characteristics;

d) rating verification and characteristic measurement;

e) environmental tests on packaging;

f) identification and ordering information. It does not deal with:

a) mountings and their effect on thyristor performance, the test results only apply for the mounting method used for that test;

b) system signal performance such as insertion loss, see [b-ITU-T G.117];

c) mechanical dimensions;

d) RoHS requirements;

e) electrical overload;

f) quality assurance requirements, see [b-IEC 60738-1];

g) specific cases of user agreed and regional values;

h) conventional thyristors as covered by [b-IEC 60747-6];

i) gated thyristor SPCs.