Siemens SENTRON 3VA1 - Description of Functions

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Description

2.6 Protection system

3VA molded case circuit breakers with IEC certificate

70 Manual, 03/2019, A5E03603177010-03

2.6.1

Description of functions

The protection function performed by the molded case circuit breaker in the power

distribution network is defined by the choice of trip unit. There are two different types of trip

unit, i.e. thermal-magnetic (TMTU) and electronic (ETU):

Main Page

Table of Contents5
Introduction11
- About this Documentation11
- Product-Specific Information12
- Target Readers12
- Technical Support12
- Reference Documents12
Description15
- Overview - Applications and Portfolio15
- Applications and Possible Uses16
- Portfolio18
- Application Examples22
- Detailed Information about Applications and Possible Uses24
- Technical Specifications26
- Molded Case Circuit Breakers and Accessories in the System30
- Ergonomic Design32
- The Right Circuit Breaker for any Installation Conditions33
- Ergonomic Design of Circuit Breakers, Handles and Control Elements36
- Wide Range of Accessories39
- Connection Technology41
- Technical Details43
- Circuit Breaker Identification44
- Operation48
- Design and Components - 3VA149
- Design and Components - 3VA250
- Current Limitation51
- Breaking Capacity53
- Infeed54
- Selectivity55
- Standards and Guidelines59
- Compliance with Standards59
- Electromagnetic Compatibility59
- Certificates60
- Ambient Conditions60
- Permissible Mounting Positions and Mounting Positions with Accessories62
- Safety Clearances63
- Arcing Spaces69
- Degrees of Protection70
- Environmental Protection70
- Protection System71
- Description of Functions72
- Characteristic Curves74
- Guide to Setting the Tripping Characteristic75
- Overload Protection (L)77
- Short-Time Delayed Short-Circuit Protection (S)78
- Instantaneous Short-Circuit Protection (I)78
- Ground-Fault Protection (G)78
- Neutral Conductor Protection (N)81
- Zone Selective Interlocking (ZSI)84
- Thermal-Magnetic Trip Unit87
- Thermal Trip Unit (L)87
- Magnetic Trip Unit with Short-Circuit Protection (I)87
- Application Cases and Trip Unit Types88
- Electronic Trip Unit89
- Connections91
- Protection Functions92
- Operator Controls95
- Load Acceptance and Load Shedding - Load Management104
- Measuring with a Rogowski Coil105
Applications111
- 3VA IEC Trip Units111
- Line Protection Applications of 3VA Molded Case Circuit Breakers112
- Variants113
- Thermal-Magnetic Trip Units113
- Electronic Trip Units117
- Overview of 3VA Molded Case Circuit Breakers in Line Protection Applications142
- Motor Protection Applications of 3VA Molded Case Circuit Breakers146
- 3VA Molded Case Circuit Breakers for Starter Protection147
- 3VA Molded Case Circuit Breakers for Motor Protection150
- 3VA2 Motor Protection Circuit Breaker up to 500 A, Tested According to IEC en 60947-4-1151
- 3VA2 Motor Protection Breaker as Tested Motor Protection Combination, 3VA2 with 3RT152
- Protection Functions of 3VA2 Molded Case Circuit Breakers for Motor Protection152
- ETU350M Electronic Trip Unit157
- 5-Series and 8-Series Electronic Trip Units160
- ETU550M Electronic Trip Unit161
- ETU860M Electronic Trip Unit163
- Use of 3VA1 Molded Case Circuit Breakers as Switch Disconnectors167
- Overview of 3VA1 as Switch Disconnectors171
- Upstream Protection of Switch Disconnectors172
- DC Network Applications of 3VA Molded Case Circuit Breakers174
- Variants175
- Breaking Capacity with Direct Current176
- Recommended Circuit Configurations for DC Systems177
- Applications of the 3VA Molded Case Circuit Breaker with Frequency Converters179
- 400 Hz Network Applications of 3VA Molded Case Circuit Breakers181
- IT System Applications of 3VA Molded Case Circuit Breakers183
- Selection Criteria for 3VA Molded Case Circuit Breakers183
- Fault Situation184
- Safety-Related Applications of 3VA Molded Case Circuit Breakers185
Accessories187
- Overview of Accessories for 3VA Molded Case Circuit Breakers187
- Accessories Groups187
- Possible Combinations of of Accessories188
- Internal Accessories193
- Mounting Locations on 3VA Molded Case Circuit Breakers193
- Auxiliary and Alarm Switches199
- Contact Sequence Diagrams203
- Technical Specifications of Auxiliary and Alarm Switches204
- Auxiliary Releases206
- Time-Delay Devices for Undervoltage Releases211
- COM060 Communication Module211
- Module212
- Connection System213
- General Information about Cables and Busbars213
- Portfolio of Connection Components for 3VA Molded Case Circuit Breakers216
- General Overview216
- Front Cable Connection220
- Front Busbar and Cable Lug Connections234
- Rear Busbar and Cable Lug Connections241
- Further Connection Accessories248
- Insulating Measures248
- Auxiliary Conductor Terminal271
- Plug-In and Draw-Out Technology274
- Introduction274
- Overview of Variants / Products277
- General Information278
- Information about Installation, Built-On and Built-In Components279
- Plug-In Technology280
- Product Description280
- Combination with Other Accessories286
- Draw-Out Technology287
- Product Description287
- Combination with Other Accessories297
- Accessories for Plug-In and Draw-Out Units297
- Description of Individual Product Variants297
- Overview of Technical Specifications309
- Combination with Other Accessories310
- Manual Operators311
- Opening, Closing and Resetting the 3VA Molded Case Circuit Breaker312
- Front Mounted Rotary Operator314
- Door Mounted Rotary Operator318
- Side Wall Mounted Rotary Operator324
- Locking and Interlocking for Manual Operators326
- Locking by the Handle326
- Locking and Interlocking by the Rotary Operator328
- Degree of Protection331
- Accessories332
Motor Operators333
MO310 Side Mounted Motor Operator333
MANUAL, AUTO and LOCK Modes336
Closing, Opening and Resetting the 3VA Molded Case Circuit Breaker338
Faults, Causes of Faults and Rectification of Faults340
Motor Operator MO320341
MANUAL, AUTO and LOCK Modes343
Opening, Closing and Resetting the 3VA Molded Case Circuit Breaker344
Faults, Causes of Faults and Rectification of Faults348
SEO520 Motor Operator with Stored Energy Operator349
MANUAL, AUTO and LOCK Modes351
Closing, Opening and Resetting the 3VA Molded Case Circuit Breaker352
Faults, Causes of Faults and Rectification of Faults355
Communication356
Accessories357
Technical Specifications359
Locking and Interlocking362
General Information362
Locking362
Interlocking363
Locking365
Padlock Device for the Handle365
Cylinder Locks for Locking the 3VA Molded Case Circuit Breaker367
Front Interlocking371
Cylinder Locks for Implementing Interlocks between Multiple 3VA Molded Case Circuit Breakers371
Sliding Bar with Bowden Cable: Modules for Sliding Bar with Bowden Cable376
Sliding Bar379
Rear Interlock381
Residual Current Devices388
Portfolio388
Possible Combinations of Residual Current Devices and 3VA Circuit Breakers396
Residual Current Devices for Mounting on Circuit Breakers397
Side Mounted Residual Current Devices Basic RCD310 and Basic RCD510399
Loadside Residual Current Devices Basic RCD320 and Basic RCD520417
Loadside Residual Current Device Basic RCD520B430
Loadside Residual Current Device Advanced RCD820454
Special Operating Modes of Residual Current Devices471
Technical Specifications474
Modular Residual Current Device480
Communication and System Integration486
System Description486
Communication System of the 3VA Molded Case Circuit Breaker486
COM800 / COM100 Breaker Data Server488
Area of Application489
Features490
Communication with Etus490
Area of Application490
DSP800 Display491
Commissioning and Testing of Electronic Trip Units Using Powerconfig492
Power Management with Powermanager496
- EFB300 External Function Box497
- General Information497
- Power Supply498
- Functions of the Digital Input and Digital Outputs498
- Zone Selective Interlocking (ZSI)501
- SET> Button503
- Technical Specifications509
- Test Devices511
- TD300 Activation and Trip Box511
- Operation and Execution of the TD300 Tripping Function512
- Technical Specifications of TD300514
- TD500 Test Device515
- Operation and Execution of Test Functions520
- Executing the Test Functions Using a PC and Powerconfig524
- Parameterizing Using the Powerconfig Software525
- Technical Specifications of TD500526
- External Current Transformer for N Conductor527
- Parameterization of the External N Transformer527
- External Current Transformer for Front Busbar Connector up to 630 a528
- External Current Transformer as Straight-Through Transformer up to 1250 a529
- Escutcheon530
- Product Description530
- Labeling Plate532
- DIN Rail Adapter533
- Introduction533
- Information about Installation, Assembly and Attachment534
Service and Maintenance537
- Notes537
- Regular Maintenance537
- Maintenance Following Tripping of a Molded Case Circuit Breaker539
- Fault Diagnostics540
Technical Specifications541
- Circuit Diagrams541
- 3VA1 Molded Case Circuit Breakers541
- Basic Units541
- Accessories544
- Example: 3VA1 Molded Case Circuit Breaker with Built-On/Built-In Accessories549
- 3VA2 Molded Case Circuit Breakers550
- Basic Units550
- Accessories552
- Example: 3VA2 Molded Case Circuit Breaker with Built-On/Built-In Accessories565
- Application Example566
- Dimensional Drawings567
- Dimensions of Basic Units567
- 3VA10 and 3VA11567
- 3Va12569
- 3Va13 / 3Va14570
- 3Va20 / 3Va21 / 3Va22571
- 3Va23 / 3Va24572
- 3Va25573
- Dimensions of Accessories574
- Connection Technology574
- Plug-In and Draw-Out Units586
- Manual Operators589
- Motor Operators602
- Accessories for Locking, Blocking and Interlocking605
- Residual Current Devices616
- Communication and System Integration621
- EFB300 External Function Box622
- Test Devices623
- External Current Transformer for N Conductor624
- Escutcheon626
- Power Losses627
- Power Losses of 3VA1 Molded Case Circuit Breakers627
- Power Losses of 3VA2 Molded Case Circuit Breakers629
- Derating and Temperature Compensation630
- Derating of 3VA1 Molded Case Circuit Breakers630
- Temperature Compensation for Thermal-Magnetic Trip Units TM210, TM220 and TM240634
- Additional Correction Factors with Frequencies Other than 50/60 Hz for 3VA1 Molded Case Circuit Breakers639
- Correction Factors with Direct Current for the Thermal-Magnetic Trip Units of 3VA1 Molded Case Circuit Breakers640
- Derating for the 3VA1 Switch Disconnector641
- Derating for the Electronic Trip Units of 3VA2 Molded Case Circuit Breakers643
- Use of Terminals with Auxiliary Conductor Connection647
Appendix649
- Standards and Approvals649
ESD Guidelines651
- Electrostatic Sensitive Devices (ESD)651
List of Abbreviations653
Conversion Tables659
- Glossary663
- Index669

Siemens SENTRON 3VA1 - Description of Functions

Table of Contents

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