Siemens SENTRON 3WA Air User Manual

3WA Air Circuit Breakers
Equipment Manual, 05/2021, 92310000002-03
3
Table of contents
1 Introduction ......................................................................................................................................... 15
1.1 Scope of validity of this document ...................................................................................... 15
1.2 Target readers of this documentation ................................................................................. 15
1.3 Technical Support .............................................................................................................. 15
1.4 Reference documents ........................................................................................................ 16
1.5 Advanced training courses ................................................................................................. 16
1.6 Safety instructions ............................................................................................................. 17
1.6.1 Security information .......................................................................................................... 18
1.6.2 Open Source Software ....................................................................................................... 18
1.6.3 More information on Open Source software for 3WA circuit breakers .................................. 19
1.7 Standards .......................................................................................................................... 20
2 Description ........................................................................................................................................... 21
2.1 Overview - applications and portfolio ................................................................................. 21
2.1.1 Properties .......................................................................................................................... 21
2.1.2 Portfolio of the 3WA1 circuit breaker .................................................................................. 23
2.1.3 Advantages........................................................................................................................ 23
2.1.4 Applications ....................................................................................................................... 24
2.2 Circuit breakers and non-automatic circuit breakers ............................................................ 26
2.2.1 Distinction between circuit breakers and non-automatic circuit breakers ............................. 26
2.2.2 Design ............................................................................................................................... 27
2.2.2.1 Circuit breakers .................................................................................................................. 27
2.2.2.2 Guide frame....................................................................................................................... 28
2.2.2.3 Secondary disconnect terminals ......................................................................................... 33
2.2.3 Circuit breaker identification .............................................................................................. 35
2.2.3.1 Rating and accessory labels ................................................................................................ 35
2.2.3.2 Guide frame rating label..................................................................................................... 37
2.2.4 Operation .......................................................................................................................... 38
2.2.4.1 Charging the stored-energy spring ..................................................................................... 38
2.2.4.2 Closing and opening .......................................................................................................... 39
2.2.4.3 Racking the circuit breaker in the guide frame .................................................................... 41
2.2.4.4 Commissioning checklist .................................................................................................... 43
2.3 Protection system .............................................................................................................. 44
2.3.1 General description of function .......................................................................................... 44
2.3.2 Option plug ....................................................................................................................... 45
2.3.3 Guideline for setting the protection parameters.................................................................. 47
2.3.4 Time-current characteristic ................................................................................................. 47
2.3.5 Description of the protective functions ............................................................................... 48
2.3.5.1 General description ............................................................................................................ 48
2.3.5.2 Long time LT ...................................................................................................................... 49
2.3.5.3 Short time ST ..................................................................................................................... 51
2.3.5.4 Instantaneous short-circuit protection INST ........................................................................ 52

Siemens SENTRON 3WA Air Specifications

General

Brand	Siemens
Model	SENTRON 3WA Air
Category	Circuit breakers
Language	English