Name: Siemens Sentron 3VA
Brand: Siemens
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Description

2.5 Protection functions

3VA molded case circuit breakers with UL and IEC certification

64 Manual, 01/2019, L1V30435333-01

2.5.1

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):

Manual, 01/2019, L1V304353333
Table of Contents5
Introduction11
- About this Documentation11
- Product-Specific Information12
- Target Readers12
- Technical Support12
- Reference Documents13
Description15
- Overview - Applications and Portfolio15
- Applications and Possible Uses15
- Aspects of the UL Market - Low-Voltage Systems in the USA16
- Portfolio18
- Detailed Information about Applications and Possible Uses23
- Technical Specifications24
- Molded Case Circuit Breakers and Accessories in the System28
- Ergonomic Design30
- Installation Variants for 3VA UL30
- Ergonomic Design of Circuit Breakers, Handles and Control Elements33
- Wide Range of Accessories36
- Connection Technology38
- Technical Details40
- Circuit Breaker Identification40
- Operation49
- Current Limitation50
- Standards and Guidelines52
- Compliance with Standards and Electromagnetic Compatibility52
- Certificates53
- Ambient Conditions53
- Permissible Mounting Positions and Mounting Positions with Accessories55
- Safety Clearances (for IEC Applications)56
- Breaker Venting61
- Minimum Enclosure Dimensions62
- IP Degrees of Protection63
- Environmental Protection64
- Protection Functions65
- Description of Functions66
- Characteristic Curves68
- Guide to Setting the Tripping Characteristic69
- Overload Protection (L)70
- Short-Time Delayed Short-Circuit Protection (S)71
- Instantaneous Short-Circuit Protection (I)71
- Ground-Fault Protection72
- Measurement Method 1: Vectorial Summation (Residual) Current72
- Measurement Method 2: Direct Detection74
- Neutral Conductor Protection (N)75
- Zone-Selective Interlocking ZSI78
- Thermal-Magnetic Trip Unit81
- Thermal-Magnetic Trip Unit (TMTU)81
- Application Cases and Trip Unit Types81
- Electronic Trip Unit82
- Electronic Trip Unit (ETU)82
- Connections83
- Arc Energy Reduction83
- Protection Functions85
- Operator Controls86
- Load Acceptance and Load Shedding - Load Management96
- Measuring with a Rogowski Coil97
Applications101
- Use of the 3VA UL Molded Case Circuit Breakers in Line Protection101
- Applications in Line Protection101
- Versions of the Trip Units104
- Thermal-Magnetic Trip Units104
- Electronic Trip Units107
- Overview of 3VA UL Molded Case Circuit Breakers in Line Protection134
- Use as Motor Circuit Protector (MCP) for Starter Combinations136
- Use of the 3VA UL Molded Case Circuit Breaker as a Molded Case Switch (MCS)140
- Compatibility of 3VA UL Molded Case Switch and Accessories142
- Use of 3VA UL Molded Case Circuit Breaker in DC Systems143
- Introduction143
- Variants144
- Breaking Capacity with Direct Current145
- Recommended Circuits for DC Systems UL146
- Recommended Circuits for DC Systems IEC148
- Use of 3VA UL Molded Case Circuit Breakers in IT Systems According to IEC 60947-2150
- Introduction150
- Selection Criteria for 3VA UL Molded Case Circuit Breakers150
- Fault Situation151
Accessories153
- Overview - Accessories for 3VA UL Molded Case Circuit Breakers153
- Internal Accessories154
- Mounting Locations of 3VA UL Molded Case Circuit Breakers154
- Auxiliary and Alarm Switches158
- Contact Sequence Diagrams161
- Technical Specifications of Auxiliary and Alarm Switches162
- Auxiliary Releases164
- Time-Delay Devices for Undervoltage Releases168
- COM060 Communication Module168
- 24 V Module169
- Connection System170
- Introduction170
- General Information about Cables and Busbars170
- Connection Portfolio for 3VA UL Molded Case Circuit Breakers174
- General Overview174
- Front Cable Connection178
- Front Busbar and Compression Lug Connections193
- Rear Busbar and Compression Lug Connections200
- Further Connection Accessories205
- Insulating Equipment205
- Control Wire Tap221
- Plug-In and Draw-Out Technology223
- Introduction223
- Overview of Variants / Products226
- General Information227
- Information about Installation, Built-On and Built-In Components228
- Plug-In Technology229
- Product Description229
- Combination with Other Accessories235
- Draw-Out Technology236
- Product Description236
- Combination with Other Accessories245
- Accessories for Plug-In and Draw-Out Units246
- Description of Individual Product Variants246
- Overview of Technical Specifications258
- Combination with Other Accessories259
- Manual Operators260
- Introduction260
- Operator Control of the 3VA UL Molded Case Circuit Breakers with Manual Operators261
- Front Mounted Rotary Operator266
- Elements of the Front Mounted Rotary Operator266
- Front Mounted Rotary Operator with Door Interlock267
- Testing the Tripping Mechanism269
- Locking, Blocking and Interlocking270
- Door Mounted Rotary Operator273
- Elements of the Door Mounted Rotary Operator273
- Door Interlock with Door Mounted Rotary Operator274
- Tolerance Compensator276
- Testing the Tripping Mechanism277
- Supplementary Handle for Door Mounted Rotary Operator278
- Variable Depth Adapter279
- Locking, Blocking and Interlocking280
- Side Wall Mounted Rotary Operator283
- Elements of the Side Wall Mounted Rotary Operator283
- Side Wall Mounted Rotary Operator with Mounting Plate284
- Locking, Blocking and Interlocking285
- Operator Kit with Bowden Cable (Max-Flex Operator)288
- Elements of the Operator Kit with Bowden Cable288
- Door Interlocking with the Operator Kit with Bowden Cable289
- Testing the Tripping Mechanism291
- Auxiliary Switches for the Operator Kit with Bowden Cable291
Locking, Blocking and Interlocking292
Degree of Protection293
IP Degree of Protection293
NEMA Degree of Protection293
Accessories294
Illumination Kit294
Motor Operator295
Elements of the Motor Operator MO320295
Description of Front Panel296
MANUAL, AUTO and LOCK Modes297
Operating the Molded Case Circuit Breaker with Motor Operator298
Faults, Causes of Faults and Rectification of Faults302
Technical Specifications303
Locking and Interlocking304
General Information304
Locking304
Interlocking305
Blocking and Locking307
Handle Blocking Device307
Cylinder Locks for Locking the 3VA Molded Case Circuit Breaker309
Front Interlocking313
Cylinder Locks for Interlocking Multiple 3VA UL Molded Case Circuit Breakers313
Cable Interlock Module Using a Bowden Cable318
Sliding Bar321
Rear Interlock323
Communication and System Integration329
System Description329
Communication System of the 3VA UL Molded Case Circuit Breaker329
COM800 / COM100 Breaker Data Server331
Area of Application333
Features333
Communication with Etus333
Area of Application334
DSP800 Display334
Commissioning and Testing of Electronic Trip Units Using Powerconfig335
Power Management with Powermanager339
EFB300 External Function Box340
General Information340
Power Supply341
Functions of the Digital Input and Digital Outputs341
Zone-Selective Interlocking ZSI342
SET> Button344
Technical Specifications351
MMB300 Maintenance Mode Box353
Operating Principle of the MMB300 Maintenance Mode Box353
Configuration of MMB300 with a 3VA6 Molded Case Circuit Breaker355
SET> Button359
Power Supply360
Technical Specifications360
- Test Devices362
- Introduction362
- The TD300 Activation and Trip Box363
- Operation and Execution of the Tripping Function364
- Technical Specifications of TD300366
- The TD500 Test Device366
- General Information, Preparations366
- Operation and Execution of Test Functions371
- Executing the Test Functions Using a PC and Powerconfig376
- Parameterizing Using the Powerconfig Software376
- Technical Specifications377
- External Current Transformer for N Conductor378
- Cover Frame380
- Product Description380
- Labeling Plate382
Service and Maintenance383
- Notes383
- Regular Maintenance384
- Maintenance Following Tripping of a Molded Case Circuit Breaker385
- Fault Diagnostics386
Technical Specifications387
- Circuit Diagrams387
- 3VA5 Molded Case Circuit Breakers387
- Basic Units387
- Accessories389
- Example: 3VA5 Molded Case Circuit Breakers with Accessories (External/Internal)392
- 3VA6 Molded Case Circuit Breakers393
- Basic Units393
- Accessories394
- Example: 3VA6 Molded Case Circuit Breakers with Accessories (External/Internal)404
- Application Example: Electrical Interlocking of Two 3VA UL Molded Case Circuit Breakers with Undervoltage Releases405
- Dimensional Drawings406
- Dimensions of Basic Units406
- 3Va51406
- 3Va52408
- 3Va61 / 3Va62409
- 3Va63 / 3Va64410
- Dimensions of Accessories411
- Connection Technology411
- Plug-In and Draw-Out Units418
- Manual Operators427
- Motor Operators441
- Locking and Interlocking442
- Communication and System Integration449
- EFB300 External Function Box450
- MMB300 Maintenance Mode Box450
- Test Devices451
- Door Cover Frame451
- Power Losses452
- Power Losses of 3VA5 Molded Case Circuit Breakers452
- Power Losses of 3VA6 Molded Case Circuit Breakers454
- Power Loses of 3VA UL Molded Case Switches455
- Derating456
- Derating of 3VA5 Molded Case Circuit Breakers456
- Use of Terminals with Control Wire Tap458
- Additional Correction Factors with Frequencies Other than 50/60 Hz for 3VA5 Molded Case Circuit Breakers459
- Derating for the Electronic Trip Units of 3VA6 Molded Case Circuit Breakers460
Appendix467
- Standards and Approvals467
- A.1 Standards and Approvals467
ESD Guidelines469
- Electrostatic Sensitive Devices (ESD)469
List of Abbreviations471
- C.1 Table of Abbreviations471
- Table of Abbreviations471
- D.1 Conversion Tables477
- Glossary481
- Index487
Conversion Tables477

Brand	Siemens
Model	Sentron 3VA
Category	Circuit breakers
Language	English

Siemens Sentron 3VA User Manual

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