This document provides guidance upon the design, construction, specification and testing of circuit-breakers with intentional non-simultaneous pole operation which are excluded from the scope of IEC 62271-100. In all other respects the scope of this document is identical to that of IEC 62271-100. This document provides supplementary information and guidance for this type of circuit-breaker and is intended to be used in conjunction with IEC 62271-100. Intentional non-simultaneous pole operation may be implemented by mechanical or electrical means and both methods are within the scope of this document. Where the implementation is by purely electrical means for example for independent pole operated circuit-breakers, adequate precautions should be taken in the application to prevent operation outside the proven capability of the circuit-breaker. Circuit-breakers with intentional non-simultaneous pole operation are mainly used for the implementation of controlled switching and this document primarily addresses the requirements of circuit-breakers for such applications. More detailed information regarding the use of controlled switching can be found in CIGRE Technical Brochures 262 [1]2, 263 [2] and 264 [3]. Requirements for associated protection and/or control facilities are not covered unless these form an integral part of the circuit-breaker. This document considers two basic system configurations for achieving non-simultaneous operation: - A circuit-breaker intended for non-simultaneous operation which is supplied and tested independent from any particular controller. - A circuit-breaker intended for non-simultaneous operation with a dedicated controller (which may be integrated into the circuit-breaker) and necessary sensors and auxiliary equipment which form part of the tested equipment. The basic requirements in each case are identical however the interpretation of the test results depends upon whether the intended controller is included in the test programme. Further details on this aspect are incorporated into clause 6 of this document. For the purposes of this document, it has been assumed that there is no significant interaction between the effects of the various parameters (for example ambient temperature, control voltage etc) which are considered to affect the mechanical performance of the circuit-breaker. This has not been proven for all combinations however service experience with controlled switching suggests this assumption is valid in practice for most commonly used drive technologies. Annex F provides some examples in support of this assumption.