scope:

This standard applies to air-break switches, air-break disconnectors, air-break switch-disconnectors and fuse-combination units to be used in distribution circuits and motor circuits the rated voltage of which does not exceed 1 000 V a.c. or 1 200 V d.c.

Notes 1. - Depending on its design, a switch (or disconnector) can be referred to as "rotary switch (disconnector)", "cam-operated switch (disconnector)", "knife-switch (disconnector)", etc.

2.- If they are not manually operated, switches and disconnectors may have to comply with additional requirements.

Any fuses incorporated shall conform to the requirements laid down in the relevant IEC fuse standards.

This standard does not apply to equipment coming within the scope of IEC Publication 157-1: Circuit-breakers, IEC Publication 158-1: Contactors, IEC Publication 292-1: Motor Starters, and IEC Publication 337-1: Control Switches; however, when switches and fuse-combination units coming into the scope of this standard are normally used to start, accelerate and/or stop a motor, they shall also comply with the additional requirements given in Appendix C.

This standard does not include the additional requirements necessary for electrical apparatus for explosive gas atmospheres.

Notes 3. - In this standard, the word "switch" also applies to the apparatus referred to in French as "commutateurs", intended to modify the conections between several circuits, and inter alia to substitute on part of a circuit for another.

4. - As a general rule, in the rest of this standard, switches, disconnectors, switch-disconnectors and fuse-combination units will be referred to as "equipment".