Standard No.:	GB/T 19520.20-2023
English Name:	Mechanical structures for electrical and electronic equipment—Dimensions of mechanical structures of the 482.6 mm (19 in) series—Part 3-108: Dimensions of R-type subracks and plug-in units
Chinese Name:	电气和电子设备机械结构 482.6 mm(19 in)系列机械结构尺寸 第3-108部分：R型插箱和插件的尺寸
Chinese Classification:	K05    Electrical product mechanical structure
Professional Classification:	GB    National Standard
Issued by:	SAMR; SAC
Issued on:	2023-11-27
Implemented on:	2024-6-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	12500 words
Price(USD):	375.0
Delivery:	via email in 1~5 business day

GB/T 19520.20-2023 Mechanical structures for electrical and electronic equipment - Dimensions of mechanical structures of the 482.6 mm (19 in) series - Part 3-108: Dimensions of R-type subracks and plug-in units 1 Scope This document provides dimensions and features for R-type subracks and plug-in units, i.e. ruggedized variants of the mechanical structures of the 482.6 mm (19 in) series, with enhanced vibration and shock resistance and/or improved EMC performance, for use in more harsh environment. This leads to a subrack standard which is externally compatible with IEC 60297-3-100 but internally largely incompatible with IEC 60297-3-101. R-type subracks, chassis integrated subracks and plug-in units incorporate dimensions and features which provide for a higher level of ruggedness, compared with IEC 60297-3-101 (test set-up and load definitions are selected from IEC 61587-1 and IEC 61587-5). 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60297-3-100 Mechanical structures for electronic equipment - Dimensions of mechanical structures of the 482.6 mm (19 in) series - Part 3-100: Basic dimensions of front panels, subracks, chassis, racks and cabinets Note: GB/T 19520.16-2015, Mechanical structures for electronic equipment - Dimension of mechanical structures of the 482.6 mm (19 in) series - Part 3-100: Basic dimensions of front panels, subracks, chassis, racks and cabinets (IEC 60297-3-100:2008, IDT) IEC 60297-3-101 Mechanical structures for electronic equipment - Dimensions of mechanical structures of the 482.6 mm (19 in) series - Part 3-101: Subracks and associated plug-in units Note: GB/T 19520.12-2009, Mechanical structures for electronic equipment - Dimensions of mechanical structures of the 482.6 mm (19 in) series - Part 3-101: Subracks and associated plug-in units (IEC 60297-3-101:2004, IDT) IEC 60297-3-105 Mechanical structures for electronic equipment - Dimensions of mechanical structures of the 482.6 mm (19 in) series - Part 3-105: Dimensions and design aspects for 1U high chassis Note: GB/T 19520.17-2010, Mechanical structures for electronic equipment - Dimension of mechanical structures of the 482.6 mm（19 in）series - Part 3-105: Dimensions and design aspects for 1U high chassis (IEC 60297-3-105:2008, IDT) IEC 61587-1 Mechanical structures for electrical and electronic equipment - Tests for IEC 60917 and IEC 60297 series - Part 1: Environmental requirements, test setups and safety aspects Note: GB/T 18663.1-2008, Mechanical structures for electronic equipment tests for IEC 60917 and IEC 60297 - Part 1: Climatic, mechanical tests and safety aspects for cabinets, racks, subracks and chassis (IEC 61587-1:2007, IDT) IEC 61587-3 Mechanical structures for electronic equipment - Tests for IEC 60917 and IEC 60297 - Part 3: Electromagnetic shielding performance tests for cabinets and subracks Note: GB/T 18663.3-2020, Mechanical structures for electronic equipment - Tests for metric and inch system - Part 3: Electromagnetic shielding performance tests for cabinets and subracks (IEC 61587-3:2013, IDT) IEC 61587-5 Mechanical structures for electronic equipment - Tests for IEC 60917 and IEC 60297 - Part 5: Seismic tests for chassis, subracks, and plug-in units Note: GB/T 18663.5-2022, Mechanical structures for electronic equipment - Tests for metric and inch system - Part 5: Seismic tests for chassis, subracks and plug-in units (IEC 61587-5:2013, IDT) IEC 62610-2 Mechanical structures for electrical and electronic equipment - Thermal management for cabinets in accordance with IEC 60297 and IEC 60917 series - Part 2: Method for the determination of forced air cooling Note: GB/T 40815.2-2021, Mechanical structures for electrical and electronic equipment - Thermal management for cabinets in accordance with inch and metric system - Part 2: Method for the determination of forced air cooling (IEC 62610-2:2018, IDT) 3 Terms and definitions For the purposes of this document the following terms and definitions apply. 3.1 R-type subrack and plug-in unit ruggedized subrack and plug-in unit, with enhanced shock and vibration resistance, with or without EMC provisions compared with subrack/plug-in units according to IEC 60297-3-101 3.2 chassis integrated subrack subrack integrated within the envelope of a chassis 4 Arrangement overview Figure 1 illustrates the typical arrangement of a R-type subrack with the associated plug-in units. 5 RA-type subrack 5.1 General Figure 2 illustrates the RA-type subrack, defined by the dimension of the first printed board position in relation to the first pitch line (see detail A). The deflection of the load bearing members of max. 0.2 mm is permitted.