GB/T 14048.2-2020Low-voltage switchgear and controlgear—Part 2: Circuit-breakers (English PDF)

Foreword

This section provisions mandatory standards. This section 7.1.3,7.1.4,7.2.1,7.2.3,7.3,8.3.3.2,8.3.3.8,8.3.5

8.4 and Appendix B, Appendix F, Appendix J and Appendix N mandatory, the rest are recommended. With an electronic overcurrent protection circuit breaker electronic

Control means EMC test is important, the electronic control unit must be manufacturers of EMC test products, such as circuit breakers factory option

EMC tests have been conducted with electronic products, and has a test report, you do not have to repeat the test.

This part is the "low-voltage switchgear and control equipment" Part 2, product standards, which includes the basic requirements of the circuit breaker and test

method. General requirements for circuit breakers, such as general terminology, test circuits, methods prescribed in Part 1.This section must

Part 1 using the binding. "Low-voltage switchgear and control equipment" includes.

--- GB 14048.1 low-voltage switchgear and control equipment - Part 1.General

--- GB 14048.2 low-voltage switchgear and control equipment Part 2.Circuit Breaker

--- GB 14048.3 low-voltage switchgear and control equipment - Part 3.Switches, disconnectors, switch and fuse combination

Electric

--- GB 14048.4 low-voltage switchgear and control equipment, electromechanical contactors and motor starters

--- GB 14048.5 low-voltage switchgear and control equipment Part 5-1.Control circuit devices and switching elements - Electromechanical control

Electrical circuit

--- GB 14048.6 low-voltage switchgear and control equipment, contactors and motor starters Section 2.AC semiconductor power

Motor controller and starters

--- GB/T 14048.7 low-voltage switchgear and control equipment - Part 7-1.Ancillary equipment - Terminal blocks for copper conductors

--- GB/T 14048.8 low-voltage switchgear and control equipment Part 7-2.Protective conductor terminal auxiliary electrical copper conductors

Terminal block

--- GB 14048.9 low-voltage switchgear and control equipment Part 6-2.Multiple function equipment (equipment) electrical control and protection switch

Device (equipment) (CPS)

--- GB/T 14048.10 voltage switchgear and control equipment Part 5-2.Control circuit devices and switching elements proximity

switch

--- GB/T 14048.11 voltage switchgear and control equipment Part 6-1.Multiple function equipment - Transfer switching equipment

--- GB/T 14048.12 voltage switchgear and control equipment Part 4-3.Contactors and motor starters --- non-electric

Motivation load AC semiconductor controllers and contactors

--- GB/T 14048.13 voltage switchgear and control equipment Part 5-3.Control circuit devices and switching elements in ---

Proximity switches with defined behavior under fault conditions (PDF) requirements

--- GB/T 14048.14 voltage switchgear and control equipment Part 5-5.Control circuit devices and switching elements having ---

Mechanical latching function electrical emergency braking device

--- GB/T 14048.15 voltage switchgear and control equipment Part 5-6.Control circuit devices and switching elements connected ---

Proximity sensor and switching amplifier DC Interface (NAMUR)

--- GB/T 14048.16 voltage switchgear and control equipment - Part 8.rotary motor control with built - in thermal protection (PTC)

Unit

This section identical with IEC 60947-2.2006 "low-voltage switchgear and control equipment Part 2.Circuit Breaker" (fourth edition in English).

This part of IEC 60947-2.2006 Differences.

--- 1.1 on rated voltage, IEC defined as no more than 1000V, 1140V for AC rated voltage of the circuit breaker can be

Refer to this standard, performance and other requirements relating to the circuit breaker by the manufacturer and user consultation;

GB 14048.2-2008/IEC 60947-2.2006

--- Taking into account national circumstances, Chapter 3, "category" in the "open style" is not reasonable, still using the usual term "universal" type, plastic shell type, also known as

"Molded case" or "MCCB";

--- 8.1.2 Type tests on location, IEC regulations in the workshop or any other suitable test chamber factory was when my

Otherwise provided by national laws and regulations, in accordance with relevant regulations.

--- 8.3.3.3.2c) 2) regarding the maximum rated control supply voltage, IEC original 30%, the suspect is wrong, change it to 35%;

--- L. 1 CBI does not provide circuit protection, especially of overload.

This Part replaces GB 14048.2-2001 "Low-voltage switchgear and control equipment low voltage circuit breakers."

This section of the main differences with GB 14048.2-2001.

--- Clearly breaker shall be published impulse withstand voltage Uimp;

--- Clear insulating material resistant to abnormal heat and fire requirements.

Fixed to the main circuit conductor insulation material 960 °C;

Other Insulation Materials 650 °C.

Inter, but not more than 1h. Breakers should not be moved during this time, in the time trial reset switch on at least every other 1min;

--- Higher demands for electromagnetic compatibility.

In addition to electronic overcurrent protection circuit breakers, but its auxiliary components, such as. undervoltage release, shunt trip, closing coil, remote

Status indicators provides electromagnetic compatibility requirements, specified in Appendix N;

--- In the type test, the electromagnetic and electronic trip unit verification discrimination (see 8.3.3.1.2);

--- Increase in Appendix L, Appendix M, Appendix N, Appendix O.

Appendix L, Appendix M, Appendix O specifies the requirements and test methods for three new products.

Appendix L requirements without over-current protection circuit breaker, referred to CBI;

Appendix M of Residual Current Devices (Without Internal Current Breaking Device), referred MRCD;

Appendix O instantaneous trip circuit breakers, Acronym ICB;

Appendix N --- EMC is not included in the additional requirements and test Annex B, Appendix F and Appendix M of the Annex.

This section of the Appendix A, Appendix B, Appendix C, Appendix F, Appendix G, Appendix H, Appendix J, Appendix L, Appendix M, N and Appendices Appendix O

Normative annex, appendix E and K are informative appendix.

This part is proposed by the China Electrical Equipment Industrial Association.

The low-voltage electrical part by the National Standardization Technical Committee (SAC/TC189) centralized.

This part by the Shanghai Electrical Apparatus Research Institute (Group) Co., Ltd. is responsible for drafting.

Participated in the drafting of this section. Changshu Switchgear Manufacturing Co., Ltd., Tianjin Baili Electric Co., Ltd., Shanghai People's electrical plant, Schneider

Electric (China) Investment Co., Ltd., Hangzhou, the switch Co., Ltd., Zhejiang Chint Electric Co., Ltd., Suzhou Wanlong Group has

Ltd., Delixi Electric Co., Ltd. Shanghai Siemens low-voltage circuit breakers, Tengen Group Co., Limited Huatong Electrical Group

The company, Tianshui Electric Co., Ltd. 宁波伊尔特 intelligent electrical switches, electrical switch Ltd. Zhejiang, Shanghai Liang letter

Electric Co., General Electric (China) Research and Development Center Co., Ltd., Zhejiang People Electric Co., Ltd., Ningbo Liaoyuan Electric Set

Group Co., Ltd. People Electric Group Co., Ltd., Beijing People's electrical plant, Universal Holdings Limited.

1 General

This section specifically referenced in GB 14048.1-2006 General provisions applicable to this section, any reference in this section of the article quoted General

Section, sub-clause, tables, figures and appendices are preceded by GB 14048.1-2006, Example. GB 14048.1-2006 in 1.2.3, GB 14048.1-

2006 or GB 14048.1-2006 Table 4 in Appendix A.

2 member (2004)

IEC 61000-3-3.2000 Electromagnetic compatibility (EMC) limits the rated current is less than 16A power supply system equipment Low voltage wave

Fixed and flicker limit correction member 1 (2001)

IEC 61000-4-3.2002 Electromagnetic compatibility (EMC) Testing and measurement techniques RFEMS test correction member 1

(2002)

IEC /T R61000-5-2.1997 Electromagnetic compatibility (EMC) guidelines for installation and adjustment of grounding and wiring

IEC 61008-1.1996 Household and similar uses overcurrent protection for residual current operated circuit breaker (RCCB) - Part 1.

General rule, REV 1 (2002)

IEC 61009-1.1996 Household and similar uses overcurrent protection for residual current operated circuit breaker (RCBO) - Part 1.

General rule, REV 1 (2002)

CISPR11.2003 Industrial, scientific and medical (ISM) radio-frequency equipment - Electromagnetic disturbance characteristics - Limits and methods of measurement correction member 1

(2004)

CISPR22.2005 Limits and methods of measurement of radio disturbance of information technology equipment, REV 1 (2005)

2 Definitions

For most of this section relates to the definition, see Chapter 2 GB 14048.1-2006 and GB/T 2900.18-2008.

Of this section, the following additional definitions should be used.

2.1

Can turn, carrying and breaking currents under normal circuit conditions, can also be turned on at specified abnormal circuit (eg short circuit), the bearing

Upload a certain time and breaking current of a mechanical switching equipment.

2.1.1

Represents a set of circuit breakers characteristic terminology, structure size of several current ratings are the same frame degree corresponding to the current amount of this group

A maximum value, said in a frame degree, the width may vary depending on the number of poles are different.

Note. This definition does not include the size standard.

2.1.2

To a significant structural differences exist between the fixed breaker frame sizes, requiring additional type testing (see 7.1.5).

2.2

A combination of a single electrical circuit breakers and fuses made, each phase by a fuse and a circuit breaker pole series.

GB 14048.2-2008/IEC 60947-2.2006

2.3

Break time short enough to prevent the short-circuit current reaches its expected peak (otherwise up to this peak) before breaking the circuit breaker.

2.4

In addition to the circuit breaker contacts partakers off, there is a set of separable contacts, so that the circuit breaker can be removed or inserted from the circuit.

NOTE. Some breaker only on the supply side of the plug-in and the load terminals is generally in wire.

2.5

In addition to the circuit breaker contacts partakers off, there is a group of the main circuit isolation isolation contacts when in the withdrawn position, you can achieve compliance

The required isolation distance breaker.

2.6

Having a housing with an insulating material molded as integral parts of the circuit breaker the circuit breaker.

2.7

Opening and closing the circuit breaker contacts at atmospheric pressure in air.

2.8

The contacts open and close the circuit breaker in a high vacuum tube.

2.9

Opening and closing the circuit breaker contacts in addition to the atmospheric gas or air in the higher pressure outside.

2.10

When closing operation, such as turning the current exceeds a predetermined value, the circuit breaker without any artificial delay opening release, but when the circuit breaker

When it does not operate in the closed position.

2.11

For short-circuit protection overcurrent release.

2.12

After a short delay for the operation of overcurrent release.

2.13

Conjoined with the circuit breaker tripping only when the operation of the circuit breaker auxiliary switch.

2.14

When the predetermined condition still exists, even if the closing command is given, each contact can be prevented from closing (ie sufficient energized closed) broken

A road.

2.15

Under specified conditions, including electrical switches, including terminal short circuit breaking (or turned on) capabilities.

GB 14048.2-2008/IEC 60947-2.2006

2.15.1

Conditions prescribed test procedures prescribed breaker does not require continuous support of its rated current capability of breaking capacity.

2.15.2

Conditions prescribed test procedures prescribed requirements for their continuous support breaker rated current capability of breaking capacity.

2.16

GB 14048.1-2006 applicable in 2.5.39 and added the following.

--- For the direct action of the circuit breaker, time off to start is the moment the current increases enough to cause the circuit breaker operation start instantly.

--- For the use of any form of auxiliary power supply circuit breaker operation, disconnect the start time instant is off or disconnected applied release

Auxiliary instantaneous power.

Note. the circuit breaker, the "off-time" is usually referred to as "release time", strictly speaking, tripping time is the moment to start the opening operation off command

The time between the moment becomes irreversible.

2.17

Two or more overcurrent protective devices in series, in order to ensure the selective overcurrent protection and/or back-up protection.

2.17.1

Two series of overcurrent protective devices An overcurrent complex. Protection of electrical power supply side (power supply side generally, but not necessarily electrically

Electrical source side) in the presence/absence of the other protective devices with the help of over-current protection, and other protective devices to prevent overload.

2.17.2

In the case of an overcurrent protection device in series two, the protective device on the load side when the implementation of the protection without causing the other protective devices

Selective overcurrent protection operation.

2.17.3

In the case of an overcurrent protection device in series two, the protective device on the load side at a given value of the overcurrent protection and the implementation of the following

When protection without causing the other protective devices selective overcurrent protection.

2.17.4

Is

Total time selectivity limit current means the load-side protection device - current characteristics and other protective devices arcing time - current characteristic

(Refer fuses) or tripping time - current characteristic (refer to the circuit breaker) current coordinates intersect.

Selectivity limit current (see Figure A.1) is a current limit.

--- In this value, the overcurrent protection device if the two series, the protective device on the load side completes its breaking operation in time to prevent

Stop on a protection device starts to operate (ie, to ensure that the selectivity);

--- More than this value, the overcurrent protection device if the two series, the protective device on the load side may not complete its breaking operation in time

But not on a protective device to prevent its start operation (ie selectivity is not guaranteed).

2.17.5

GB 14048.1-2006 in 2.5.24 apply.

GB 14048.2-2008/IEC 60947-2.2006

2.17.6

IB

GB 14048.1-2006 applicable in 2.5.25 and added the following.

Purpose of this part, GB 14048.1-2006 2.5.25 apply to the off-time >=0.05s two series overcurrent protection

Means.

For off time < overcurrent device 0.05s two series can be considered as complex, see Appendix A.

Note. The transfer means the current maximum breaking time overcurrent protective devices in series between two sets - current characteristic intersects the current coordinates.

2.18

To the maximum current can be expected, the largest prospective current corresponding to the rated short-circuit breaking capacity and associated voltage current expectations.

2.19

After a circuit breaker overcurrent trip back to its reach through time between a closed condition.

2.20

So release without any artificial delay action current rating.

Category 3

4 Characteristics of circuit breakers