GB/Z 25842.2-2012Low-voltage switchgear and controlgear - Over-current protective devices - Part 2: Selectivity under over-current conditions (English PDF)

Foreword

GB /Z 25842 "low-voltage switchgear and control equipment over-current protection electrical" is divided into two parts.

--- Part 1. The application of short-circuit fixed;

--- Part 2. Over-current conditions of selectivity. This Guidance Document is Part 2 of GB /Z 25842.

This instructional document has been drafted in accordance with the rules given in GB/T 1.1-2009.

This Guidance Document is equivalent to IEC /T R61912-2.2009 "Low-voltage switchgear and control equipment over-current protection device 2 Part. Over-current conditions of selectivity. " Our document, which corresponds in a consistent manner to the international documents that are normative references in this Guidance Document, is as follows.

--- GB 14048.1 low-voltage switchgear and control equipment Part 1. General (IEC 60947-1:2007, MOD)

--- GB 14048.4-2010 low-voltage switchgear and control equipment Part 4-1. Contactor and motor starter motor Contactor and motor starter (including motor protectors) (IEC 60947-4-1:2009, MOD)

--- GB 16916.1-2003 Residual current operated circuit breakers (RCCB) for household and similar purposes without overcurrent protection Part 1. General rules (IEC 61008-1:1996, MOD)

--- GB 16917.1-2003 Residual current operated circuit breakers (RCBO) with overcurrent protection for household and similar purposes No. 1 Section. General rules (IEC 61009-1:1996, MOD)

The following editorial changes have been made to this technical document.

--- Remove the foreword of the international standard;

--- Remove 3.1 international standards in the 3.1 term index;

--- "This report" be changed to "the guidance of technical documents";

--- Reference document IEC /T R61459 "Fuse and contactor/motor starter coordinated use of Guide" and IEC /T R61818 "Low-voltage Fuse Application Guide" instead quoted IEC 60269-5:2010 "Low-voltage Fuse Application Guide."

The guidance of technical documents by the National Standardization Technical Committee of low-voltage electrical (SAC/TC189) centralized.

1 Scope

This guidance document defines the definitions of terms.

This guideline applies to the selective application of low-voltage switch equipment and control equipment over-current protection between the selective application of guidelines and Some examples of applications are given. The following product standards are referenced in this guidance document.

--- IEC 60255-3, IEC 60255-6, IEC 60255-8, IEC 60255-12;

--- IEC 60269-1, IEC 60269-2, IEC 60269-3, IEC 60269-4;

--- IEC 60898-1;

--- IEC 60947 series;

--- IEC 61008-1 series;

--- IEC 61009-1 series.

This guidance does not consider other forms of protection, such as reverse power protection, directional protection and arc protection systems.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB 10963.1-2005 Electrical accessories for household and similar places overcurrent protection circuit breaker Part 1. Road devices (IEC 60898-1:2002, IDT) Low-voltage fuses Part 1. Basic requirements (IEC 60269-1:2006, IDT)

Low voltage fuses - Part 2. Supplementary requirements for fuses used by full time personnel (mainly for workers Industry Fuses) Standard Fuse System Examples A to I (IEC 60269-2:2006, IDT)

GB 13539.3-2008 Low-voltage fuses - Part 3 - Supplementary requirements for fuses used by unskilled persons (mainly for domestic use And Fuses of Similar Purposes) Examples of Standardized Fuse Systems A to F (IEC 60269-3:2006, IDT)

GB 14048.2-2008 Low-voltage switchgear and controlgear - Part 2. Circuit breakers (IEC 60947-2:2006, IDT)

GB 14048.6-2008 Low-voltage switchgear and control equipment - Part 4-2. Contactor and motor starter AC semiconductors Body motor controllers and starters (including soft starter) (IEC 60947-4-2:2007, IDT)

GB 14048.9 Low-voltage switchgear and control equipment Part 6-2. Multi-function electrical (equipment) control and protection switch electrical equipment Prepared) (CPS) (IEC 60947-6-2:2007, IDT)

GB /Z 25842.1-2010 Low-voltage switchgear and controlgear overcurrent protection appliances Part 1. Application of short-circuit fixed (IEC /T R61912-1.2007, IDT)

IEC 60947-1-2007 low-voltage switchgear and control equipment Part 1. General (Low-voltageswithgearandcon-trolgear-Part 1: Generalrules)

IEC 60255 (all parts) Electrical Relays (Electricalrelays)

IEC 60269-4, Low voltage fuses - Part 4. Supplementary requirements for semiconductor equipment protection fuses (Low-voltage fuses- Part 4: Supplementaryrequirementsforfuse-linksfortheprotectionofsemiconductordevices)