Product Details
- Edition:
- 2
- Published:
- 05/31/2022
- Note:
- This product is unavailable in Ukraine, Russia, Belarus
NFPA-FIRE NFPA-FLUID EEMUA UL CTA AWS
NFPA-FIRE NFPA-FLUID EEMUA UL CTA AWS
Click here to purchase
Standard for Low-Voltage Switchgear and Controlgear – Part 4-2: Contactors and Motor-Starters – AC Semiconductor Motor Controllers and Starters
UL 60947-4-2
1 Scope and object
This standard applies to controllers and starters, which may include a series mechanical switching device, intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V a.c.This standard characterizes controllers and starters with and without bypass means.Controllers and starters dealt with in this standard are not normally designed 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 or starter.In this context, this standard gives requirements for controllers and starters associated with separate short-circuit protective devices.This standard does not apply to:
Contactors, overload relays and control circuit devices used in controllers and starters 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.The object of this standard is to state as follows: