IEC 60947-4-1:2000
Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters; Electromechanical contactors and motor starters

Standard No.

IEC 60947-4-1:2000

Release Date

2000

Published By

International Electrotechnical Commission (IEC)

Status

Withdraw

Replace By

IEC 60947-4-1:2000/COR1:2001

Latest

IEC 60947-4-1:2023 PRV

Scope

This part of IEC 60947 applies to the types of equipment listed in 1.1 and 1.2 whose main contacts are intended to be connected to circuits the rated voltage of which does not exceed 1 000 V a.c. or 1 500 V d.c. Starters and/or contactors dealt with in this standard are not normally designed to interrupt short-circuit currents. Therefore, suitable short-circuit protection (see 9.3.4) shall form part of the installation but not necessarily of the contactor or the starter. In this context, this standard gives requirements for: - contactors associated with overload and/or short-circuit protective devices; - starters associated with separate short-circuit protective devices and/or with separate short-circuit and integrated overload protective devices; - contactors or starters combined, under specified conditions, with their own short-circuit protective devices. Such combinations, e.g. combination starters (see 3.2.7) or protected starters (see 3.2.8) are rated as units. Circuit-breakers and fuse-combination units used as short-circuit protective devices in combination starters and in protected starters shall comply with the requirements of IEC 60947-2 and IEC 60947-3, as the case may be. Equipment covered by this standard is as follows. 1 AC and d.c. contactors AC and d.c. contactors intended for closing and opening electric circuits and, if combined with suitable relays (see 1.2), for protecting these circuits against operating overloads which may occur therein. NOTE Contactors combined with suitable relays and which are intended to provide short-circuit protection shall additionally satisfy the relevant conditions specified for circuit-breakers (IEC 60947-2). This standard applies also to the actuators of contactor relays and to the contacts dedicated exclusively to the coil circuit of a contactor. Contactors or starters with an electronically controlled electromagnet are also covered by this standard. 2 AC motor-starters AC motor-starters intended to start and accelerate motors to normal speed, to ensure continuous operation of motors, to switch off the supply from the motor and to provide means for the protection of motors and associated circuits against operating overloads. Starters the operation of which depends on thermal electrical relays for motor protection complying with IEC 60255-8, or motor-incorporated thermal protective devices dealt with in IEC 60034-11 do not necessarily meet all the relevant requirements of this standard. Overload relays for starters, including those based on solid state technology, shall meet the requirements of this standard. 2.1 Direct-on-line (full voltage) a.c. starters Direct-on-line starters intended to start and accelerate a motor to normal speed, to provide means for the protection of the motor and its associated circuits against operating overloads, and to switch off the supply from the motor. This standard applies also to reversing starters. 2.2 Reduced voltage a.c. starters Reduced voltage a.c. starters intended to start and accelerate a motor to normal speed by connecting the line voltage across the motor terminals in more than one step or by gradually increasing the voltage applied to the terminals, to provide means for the protection of the motor and its associated circuits against operating overloads, and to switch off the supply from the motor. Automatic change-over devices may be used to control the successive switching operations from one step to the others. Such automatic change-over devices are, for example, time-delay contactor relays or specified time all-or-nothing relays, under-current devices and automatic acceleration control devices (see 5.10). 2.2.1 Star-delta starters Star-delta starters intended to start a three-phase motor in the star connection, to ensure continuous operation in the delta connection, to provide means for the protection of the motor and its associated circuits against operating overloads, and to switch off the supply from the motor. The st

IEC 60947-4-1:2000 history

• 0000 IEC 60947-4-1:2023 PRV
• 2021 IEC 60947-4-1:2018/COR2:2021 Corrigendum 2 - Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
• 2020 IEC 60947-4-1:2018/ISH1:2020 Interpretation sheet 1 - Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
• 0000 IEC 60947-4-1:2018 RLV
• 2012 IEC 60947-4-1:2009/AMD1:2012 Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters; Amendment 1
• 2012 IEC 60947-4-1:2012 Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
• 2009 IEC 60947-4-1:2009 Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
• 1970 IEC 60947-4-1:2000/AMD2:2005 Amendment 2 - Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
• 1970 IEC 60947-4-1:2000/AMD1:2002 Amendment 1 - Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
• 2002 IEC 60947-4-1:2002 Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters; Electromechanical contactors and motor-starters
• 1970 IEC 60947-4-1:2000/COR1:2001 Corrigendum 1 - Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
• 2000 IEC 60947-4-1:2000 Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters; Electromechanical contactors and motor starters
• 1970 IEC 60947-4-1:1990/AMD2:1996 Amendment 2 - Low-voltage switchgear and controlgear. Part 4: Contactors and motor-starters - Section One: Electromechanical contactors and motor-starters
• 1970 IEC 60947-4-1:1990/AMD1:1994 Amendment 1 - Low-voltage switchgear and controlgear. Part 4: Contactors and motor-starters - Section One: Electromechanical contactors and motor-starters
• 1991 IEC 60947-4-1:1990/COR1:1991 Low-voltage switchgear and controlgear. Part 4: Contactors and motor-starters — Section One: Electrotechnical contactors and motor-starters
• 1990 IEC 60947-4-1:1990 Low-Voltage Switchgear and Controlgear Part 4: Contactors and Motor-Starters Section One - Electromechanical Contactors and Motor-Starters (Edition 1.0; Amendment 1-1994; Amendment 2-1996; Replaces 60292-1 thru 4)