General about IEC:
The International Electrotechnical Commission (IEC) is an international standards organization that prepares and publishes international standards for all electrical, electronic, and related technologies – collectively known as "electrotechnology". IEC standards cover a vast range of technologies from power generation, transmission, and distribution to home appliances and office equipment, semiconductors, fiber optics, batteries, solar energy,
nanotechnology, and marine energy as well as many others. The IEC also manages four] global conformity assessment systems that certify whether equipment, systems, or components conform to its international standards Switchgear IEC standards:
IEC Standards play a very important role in familiarizing and testing different switchgear. Standards are an important source for understanding, testing, and educating a variety of switchgear.
About IEC 62271-100:
This standard is part 100 of IEC 62271 published about switchgear. This standard is mostly used for medium-voltage and high-voltage circuit breakers. This part of IEC 62271 specifies circuit breakers designed for indoor or outdoor installation and for operation at frequencies of 50 Hz and 60 Hz on systems having voltages above 1000 V., It is only applicable to three-pole circuit breakers for use in three-phase systems and single-pole circuit breakers for use in single-phase systems. Note: Although primarily dedicated to three-phase systems, this standard can also be applied to single-phase or two phase systems.
IEC62271-100 is only applicable to three-pole circuit-breakers for use in three-phase systems and single-pole circuit breakers for use in single-phase systems. Two-pole circuit-breakers for use in single-phase systems and applications at frequencies lower than 50 Hz are subject to agreement between manufacturer and user.
This standard is also applicable to the operating devices of circuit-breakers and to their auxiliary equipment. However, a circuit-breaker with a closing mechanism for dependent manual operation is not covered by this standard, as a rated short-circuit making-current cannot be specified, and such dependent manual operation may be objectionable because of safety considerations.
Rules for high voltage circuit-breakers with an intentional non-simultaneity between the poles are under consideration; circuit-breakers providing single-pole auto-reclosing are within the scope of this standard.