GB/T 14048.4-2020 English PDF (GBT14048.4-2020)

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GB/T 14048.4-2020: Low-voltage switchgear and controlgear -- Part 4-1: Contactors and motor-starters -- Electromechanical contactors and motor-starters(Including motor protector)
GB/T 14048.4-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.130.20
K 32
Replacing GB/T 14048.4-2010
Low-voltage switchgear and controlgear - Part 4-1.
Contactors and motor-starters - Electromechanical
contactors and motor-starters (Including motor protector)
(IEC 60947-4-1.2018, Low-voltage switchgear and controlgear - Part 4-1.Contactors
and motor-starters - Electromechanical contactors and motor-starters, MOD)
ISSUED ON. SEPTEMBER 29, 2020
IMPLEMENTED ON. APRIL 01, 2021
Issued by. State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword... 4 
Introduction... 9 
1 Scope... 10 
2 Normative references... 11 
3 Terms, definitions, symbols and abbreviated terms... 13 
4 Classification... 28 
5 Characteristics of contactors and starters... 28 
6 Product information... 48 
7 Normal service, mounting and transport conditions... 53 
8 Constructional and performance requirements... 53 
9 Tests... 82 
Annex A (Normative) Marking and identification of terminals of contactors and
associated overload relays... 120 
Annex B (Normative) Special tests... 122 
Annex C (Informative) Typical characteristics of starters... 132 
Annex D (Normative) Items subject to agreement between manufacturer and user 139 
Annex E Void... 140 
Annex F (Normative) Requirements for auxiliary contact linked with power contact
(mirror contact)... 141 
Annex G (Informative) Rated operational currents and rated operational powers of
switching devices for electrical motors... 144 
Annex H (Normative) Extended functions to electronic overload relays... 149 
Annex I (Informative) AC-1 contactors for use with semiconductor controlled motor
load... 151 
Annex J Void... 152 
Annex K (Normative) Procedure to determine data for electromechanical contactors
used in functional safety applications... 153 
Annex L (Normative) Assessment procedure for electromechanical overload protection
device used in safety applications and especially in explosive atmospheres... 155 
Annex M (Normative) DC contactors for use in photovoltaic (PV) applications... 171 
Annex N (Normative) Additional requirements and tests for equipment with protective
separation... 180 
Annex O (Informative) Load monitoring... 183 
Annex P (Normative) Short-circuit breaking tests of MPSD... 188 
Annex Q (Normative) Co-ordination under short-circuit conditions between a MPSD
and another short-circuit protective device associated in the same circuit... 195 
Bibliography... 204 
Foreword
GB/T 14048 "Low-voltage switchgear and controlgear" consists of the following parts.
- Part 1.General rules;
- Part 2.Circuit-breakers;
- Part 3.Switches, disconnectors, switch-disconnectors and fuse-combination units;
- Part 4-1.Contactors and motor-starters - Electromechanical contactors and motor-
starters (Including motor protector);
- Part 4-2.Contactors and motor-starters - AC semiconductor motor controllers and
starters (including soft-starters);
- Part 4-3.Contactors and motor-starters - AC semiconductor controllers and
contactors for non-motor loads;
- Part 5-1.Control circuit devices and switching element - Electromechanical control
circuit devices;
- Part 5-2.Control circuit appliances and switching elements - Proximity switches;
- Part 5-3.Control circuit devices and switching elements - Requirements for
proximity devices with defined behaviour under fault conditions (PDDB);
- Part 5-4.Control circuit devices and switching elements - Method of assessing the
performance of low-energy contacts - Special tests;
- Part 5-5.Control circuit devices and switching elements - Electrical emergency
stop device with mechanical latching function;
- Part 5-6.Control circuit devices and switching elements - DC interface for
proximity sensors and switching amplifiers (NAMUR);
- Part 5-7.Control circuit devices and switching elements - Requirements for
proximity devices with analogue output;
- Part 5-8.Control circuit devices and switching elements - Three-position enabling
switches;
- Part 5-9.Control circuit devices and switching elements - Flow rate switches;
- Part 6-1.Multiple function equipment - Transfer switching equipment;
- Section 6-2.Multiple function equipment control and protective switching devices
(or equipment) (CPS);
- Part 7-1.Ancillary equipment - Terminal blocks for copper conductors;
- Part 7-2.Ancillary equipment - Protective conductor terminal blocks for copper
conductors;
- Part 7-3.Ancillary equipment - Safety requirements for fuse terminal blocks;
- Part 7-4.Ancillary equipment - PCB terminal blocks for copper conductors;
- Part 8.Control units for built-in thermal protection (PTC) for rotating electrical
machines.
This Part is Part 4-1 of GB/T 14048.
This Part is drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces GB/T 14048.4-2010 "Low-voltage switchgear and control gear - Part
4-1.Contactors and motor-starters - Electromechanical contactors and motor-starters
(Including motor protector)". Compared with GB/T 14048.4-2010, the main technical
changes in this Part are as follows.
- Modify the definition of reversing starter.
- Add relevant requirements and tests for motor protective switching device MPSD.
- Add some requirements concerning safety aspects, including.
 General;
 Circuits sourced from limited energy sources;
 Electronic circuits;
 Assessment procedure for electromechanical overload protection device used
in safety applications (see Annex L).
- In order to adapt to the use conditions of motors with higher energy efficiency, add
the relevant regulations for high locked rotor current.
- Add requirements for special wiring accessories.
- Add measurement of pick-up power consumption.
- Be consistent with the latest content of IEC 60947-1A2.2014.
- Add relevant DC requirements for PV applications (see Annex M).
- Add the content of load monitoring (see Annex O).
- Add the co-ordination under short-circuit conditions between a MPSD and another
short-circuit protective device in the same circuit (see Annex Q).
- Delete the previous Annex J - Communication function of electronic overload relay.
This Part uses the redraft law to modify and adopt IEC 60947-4-1.2018 "Low-voltage
switchgear and controlgear - Part 4-1.Contactors and motor-starters -
Electromechanical contactors and motor-starters".
The technical differences between this Part and IEC 60947-4-1.2018 and their reasons
are as follows.
- As for the normative references, this Part has made adjustments with technical
differences, to adapt to the technical conditions of China. The adjustments are
mainly reflected in Clause 2 “Normative references”. The specific adjustments are
as follows.
 Replace IEC 60034-1.2017 with GB/T 755-2019 which is identical to the
international standard;
 Replace IEC 60034-12.2016 with GB/T 21210-2016 which is identical to the
international standard;
 Replace IEC 60034-30-1 with GB/T 32891.1 which is identical to the
international standard;
 Replace IEC 60038 with GB/T 156 which modifies and adopts the
international standard;
 Replace IEC 60068-2-14.2009 with GB/T 2423.22-2012 which is identical to
the international standard;
 Replace IEC 60079-14 with GB/T 3836.15-2017 which modifies and adopts
the international standard;
 Replace IEC 60085.2007 with GB/T 11021-2014 which ...