3AH5
Vacuum Circuit-Breaker
For Standard
Applications
Siemens Medium Voltage
Schutzvermerk /©Copyright-Vermerk
Siemens AG 2009
Sector Energy, Business Unit Medium Voltage
3AH5 Vacuum Circuit-Breaker
Directory
1. Technical Data
2. Portfolio
3. Product Features
4. Details
5. Applications
Slide 2
September 2009
© Siemens AG 2009
Sector Energy, Business Unit Medium Voltage
3AH5 Vacuum Circuit-Breaker
1. Technical Data
Slide 3
September 2009
Rated voltage
up to 36 kV
Short-circuit breaking current
up to 31,5 kA
Operating current
up to 2500 A
Mechanical operating cycles
10,000 (M2)
Electrical operating cycles
10,000 (E2, C2)
© Siemens AG 2009
Sector Energy, Business Unit Medium Voltage
3AH5 Vacuum Circuit-Breaker
2. Portfolio
Slide 4
September 2009
© Siemens AG 2009
Sector Energy, Business Unit Medium Voltage
3AH5 Vacuum Circuit-Breaker
3. Product Features
Main Data
 12, 17,5, 24 & 36 kV
 800 to 2500 A
 13,1 to 31,5 kA
 Up to 10,000 mechanical operating cycles
 Type tested according to
IEC 62271-100
Your Benefit
 Usage for all standard application in
medium voltage
 Compact dimensions
 Maintenance free up to 10,000
operating cycles
Slide 5
September 2009
© Siemens AG 2009
Sector Energy, Business Unit Medium Voltage
3AH5 Vacuum Circuit-Breaker
3. Product Features
Product Features
 Column construction
 Vacuum interrupters are vertically
arranged
 Free convection possible
 Solid insulation material is
minimised as far as possible
Your Benefit
 High mechanical stability
 Compact dimensions
 No forced-cooling up to 2500 A
 Very low fire load
 Easy access to all parts
Slide 6
September 2009
© Siemens AG 2009
Sector Energy, Business Unit Medium Voltage
3AH5 Vacuum Circuit-Breaker
4. Details
Push button “ON”
Hand crank
coupling
Indicator „Closing
spring charged“
Counter for
“Operating cycles”
Push button “OFF”
Indicator
„Closed/Open“
Slide 7
September 2009
© Siemens AG 2009
Sector Energy, Business Unit Medium Voltage
3AH5 Vacuum Circuit-Breaker
4. Details
Operating unit
Cooling element
Auxiliary switch
Gearbox
Shunt release
Opening magnet
Closing spring
Slide 8
September 2009
© Siemens AG 2009
Sector Energy, Business Unit Medium Voltage
3AH5 Vacuum Circuit-Breaker
4. Details
Secondary equipment
 Basic equipped
Slide 9
 Fully equipped
September 2009
© Siemens AG 2009
Sector Energy, Business Unit Medium Voltage
3AH5 Vacuum Circuit-Breaker
4. Details
Comparison: Use of Insulation and Plastics
3AH5
column construction
SION
shell construction
Competition
embedded pole
12 kV
4 kg
13 kg
17 kg
12 kV
4 kg
14 kg
23 kg
2500A
Phase barrier drive
12 kV
10 kg
13 kg
17 kg
PMA 160 mm
Phase barriers
17,5 kV
10 kg
16 kg
17 kg
PMA 150/160 mm
Phase barriers
Phase barrier drive
Phase barrier
contact arms
Slide 10
September 2009
© Siemens AG 2009
Sector Energy, Business Unit Medium Voltage
Applications for 3AH5
5. Switching of Standard Applications
Requirements
 Switching of transformers, drives, capacitors,
Industry Application “Refinery”
filter circuits, overhead lines and cables
 Synchronising of parallel networks
 Rapid load transfer of consumers to other
incoming feeder
 Auto-reclosing in overhead lines to clear
transient faults or short-circuits
 Switching of short-circuits
Slide 11
September 2009
© Siemens AG 2009
Sector Energy, Business Unit Medium Voltage
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Slide 12
September 2009
© Siemens AG 2009
Sector Energy, Business Unit Medium Voltage