Vacuum circuit breaker 3AP DCB series

dead-tanklive-tankair-insulated

Overview
Discover Siemens Energy circuit breakers designed to protect power grids with dependable performance, proven technology, and long service life. Bringing Zero closer with Zero F-gas Blue circuit breakers operating up to 145 kV, with further solutions available up to 1100 kV. Since 2010, Siemens Energy F-gas-free breakers have set new standards, allowing you to meet environmental regulations while maintaining optimal performance. With a well-proven modular platform concept, our high-voltage circuit breakers are adaptable to specific requirements and extremely high voltage levels.

Key benefits

• Proven, modular platform concept for adaptability to customer requirements
• Solutions available from distribution to ultra-high-voltage (up to 1100 kV)
• Blue portfolio: zero F-gases, zero GWP, zero toxicity (clean air and vacuum switching technology)
• Products designed for long service life and low maintenance (maintenance-free intervals specified for many products)

Overview and applications
When choosing a circuit breaker, you want a solution that ensures quality, reliability, and innovation tailored to your needs. Our extensive range includes breakers for transmission and substation applications, supporting sustainability and operational efficiency.

Classification of high-voltage breakers

• Live tank circuit breakers (LT) — modular designs for the highest voltages
• Dead tank circuit breakers (DT) and Dead Tank Compact (DTC) — space-saving and flexible options
• Disconnecting circuit breakers (DCB) — combine switching and disconnecting functions to reduce footprint

Comparison table (type | voltage range | key features)
Circuit breaker type | Voltage range | Key features
Live tank circuit breakers | 72.5 kV to 1100 kV | Modular design, single- or three-pole operation, porcelain or composite insulators option, optional closing resistors
Dead tank circuit breakers | 72.5 kV to 550 kV | Up to 90 kA interruption, 2-cycle operation, common or separate bases, optional closing resistors, flexible current transformer solutions
Dead tank compact (DTC) | 145 kV and 245 kV | Space-saving design with similar operational flexibility and reliability
Disconnecting circuit breakers (DCB) | 145 kV and 420 kV | Combines switching and disconnecting functions, reduces substation footprint, simplifies system design

Representative product family highlights and model features

• 3AV1 FG / 3AV1 FG Blue: zero F-gases, zero GWP; voltages up to 145 kV; Blue family uses vacuum interruption for high environmental performance; operational since 2017
• 3AP1 FG: operates up to 245 kV; one interrupter unit per pole; temperature range -60 to +55 °C
• 3AP1 FI: operates up to 300 kV; one-pole operation with separate bases; very high seismic stability
• 3AP2/3 FI: voltages up to 550 kV; two interrupter units per pole; maintenance after ~25 years
• 3AP2 DCB 420 kV and 3AP1 DCB 145 kV: combine breaker and disconnector in one device, cost- and space-saving; available with single-pole or three-pole operating mechanisms as specified
• 3AP4/5 FI: voltages up to 800 kV; up to four interrupter units per pole; available with or without closing resistors
• Dead-tank models (3AP2/3 DT, 3AP1 DT, 3AP1 DTC, 3AV1 Blue DT): options for low-temperature operation, mixed gas configurations, compact arrangements, two interrupter units per pole for higher voltage ratings

Circuit breaker technology
Siemens Energy breakers employ three primary technological principles:

• Vacuum interruption principle — backbone of the 3AV1 Blue portfolio: zero CO2/F-gas emissions, hermetic tightness, high switching performance without degradation, sealed-for-life (zero maintenance for interrupter units)
• Self-compression principle (and dynamic self-compression) — arc-quenching method used across the 3AP family up to 1100 kV, proven since Siemens patent of 1973
• Stored-energy spring-drive mechanism — patented drive concept with opening and closing springs inside the operating mechanism; variants differ in number/arrangement of springs; high reliability and low operating energy (guaranteed operating cycles)

Accessories and digital solutions

• PSD control unit: reduces overvoltages and protects electrical equipment; supports single- and three-phase auto-reclosing; configurable software; IEC 61850 / DNP3 station communication; graphical evaluation and switching-history logging
• SiCEA01 contact erosion analyzer: determines contact wear from breaker switching currents; warning and alarm limits; ambient temperature range from -40 to +85 °C; Ethernet communication and relay outputs
• Sensgear®: digital monitoring solution for switchgear and breakers — real-time monitoring, analytics, GPS/local weather and product-specific measurement data; encrypted cloud transmission; enables proactive maintenance and faster diagnostics

Downloads (brochures and flyers)
Brochures and flyers are available for the overall HV circuit breaker portfolio, Blue products, specific 3AV1 Blue dead tank and live tank flyers, PSD control unit, and various product flyers (US-specific flyers for SPS and SPS2 series).

Caractéristiques / spécifications techniques

• Voltage coverage: from 72.5 kV up to 1100 kV depending on product family
• Interruption capability: up to 90 kA for selected dead tank designs
• Operating principles: vacuum interruption, self-compression, dynamic self-compression
• Drive mechanism: stored-energy spring drive — maintenance-free for up to 25 years (typical for many families) or specified number of operation cycles
• Blue portfolio specifics: zero F-gases, zero greenhouse-gas potential (zero GWP), suitable for clean-air and vacuum switching implementations
• Temperature and environmental ranges: some models rated from -60 °C to +55 °C; special low-temperature variants available
• Design options: single- or three-pole operation, single-pole mechanisms on separate bases, common or separate bases, porcelain or composite insulators, optional closing resistors
• Monitoring & diagnostics: Sensgear® digital monitoring; SiCEA01 contact erosion analysis; PSD control for controlled switching