60947-4-3-1999 Low-Voltage Switchgear and Controlgear Part 4-3: Contactors and Motor-Starters - AC Semiconductor Controllers and Contactors for Non-Motor Loads (Edition 1.0)
Appareillage A Basse Tension - Partie 4-3: Contracteurs Et Demarreurs De Moteurs - Gradateurs Et Contacteurs A Semiconducteurs Pour Charges@ Autres Que Des Moteurs@ A Courant Alternatif (Edition 1.0)
Low-Voltage Switchgear and Controlgear Part 4-3: Contactors and Motor-Starters - AC Semiconductor Controllers and Contactors for Non-Motor Loads (Edition 1.0) 是非强制性国家标准，您可以免费下载前三页
This part of IEC 60947 applies to a.c. semiconductor non-motor load controllers and contactors intended for performing electrical operations by changing the state of a.c. electric circuits between the ON-state and the OFF-state. Typical applications are given in table 2. As controllers@ they may be used to reduce the amplitude of the r.m.s. a.c. voltage on the load terminals from that of the applied voltage - either continuously or for a specified period of time. The half-wave period of the a.c. wave form remains unchanged from that of the applied voltage. They may include a series mechanical switching device and are intended to be connected to circuits@ the rated voltage of which does not exceed 1 O00 V a.c. The semiconductor controllers and contactors dealt with in this standard are not normally intended to interrupt short-circuit currents. Therefore@ suitable short-circuit protection (see 8.2.5) should form part of the installation but not necessarily of the controller itself.?In this context@ this standard gives requirements for semiconductor controllers and contactors associated with separate short-circuit protective devices. This standard does not apply to - continuous operation of a.c. motors; - low-voltage a.c. semiconductor motor controllers and starters covered by IEC 60947-4-2;?- electronic a.c. power controllers covered by IEC 60146; - all-or-nothing soIid-state relays. Contactors and control-circuit devices used in semiconductor controllers and contactors should comply with the requirements of their relevant product standard. Where mechanical switching devices are used@ they should meet the requirements of their own IEC product standard and the additional requirements of this standard.?