Medium-voltage vacuum replacement generator circuit breakers

Digital GCB Bottle

Tested to IEC/IEEE 62271-37-013 and suitable for generators up to 400 MW

Replacement generator circuit breakers (GCBs) provide a cost-effective way to upgrade from gas to current vacuum technology while increasing equipment reliability and minimizing downtime. Siemens offers medium-voltage vacuum replacement generator circuit breakers for leading OEM models for voltages up to 24 kV with interrupting capabilities up to 100 kA for both indoor and outdoor applications.

0-24 kV
  • up to 400 MW

  • up to 100 kA

Why upgrade to replacement vacuum generator circuit breakers?

Reduce lifecycle maintenance

  • Expected life of 30,000 mechanical operations utilizing Siemens 3AH operator

  • Up to 50 full-fault interruptions

Reduced operating and maintenance expenditures

  • Significantly lower lifecycle cost than gas circuit breakers

  • No major maintenance required for 10 years or 10,000 mechanical operations

Improved employee and environmental safety by eliminating SF6 gas

  • Eco-friendly vacuum interruption with low carbon footprint

  • No gas handling equipment required

Preserved investment in existing cubicles

  • No modification to cubicles needed

Reduced downtime and minimal changeover time during upgrade.

Custom engineering for easy installation

Siemens replacement generator circuit breakers are custom engineered to fit each application with:

  • Little-to-no cubicle modification

  • Custom wiring and controls engineered in North Carolina, USA

  • Maintain existing connectors and other peripherals.

Quality starts at the core.

Siemens core 3AH operator is featured in our entire medium-voltage circuit breaker product line, including our replacements, providing an extremely reliable standard design allowing for steamlined parts and maintenance translating into cost savings.


3AH benefits include:

  • Type tested according to IEC/IEEE 62271-37-013

  • Low maintenance - 10 years/10,000 operations

  • No re-lubrication or re-adjustment required over service life of more than 20 years (3AH37/38)

  • Full spring mechanism - no hydraulic components

  • Standardized training across Siemens medium-voltage products.

3AH operator features include:

  • Spring charge motor mechanism with lifetime lubricated gear box

  • Operating linkages with machined parts, not stamped metal

  • Change-out of components are easily accessible.

Major cost savings with vacuum replacement generator circuit breakers

With minimal operational and maintenance expenses adding up to significantly lower lifecycle costs, upgrading from gas to vacuum technology provides a quick payback on your investment.

  • Siemens' purchase price can rival the cost of some major maintenance intervals alone.

  • Eliminate overhauls and major rebuilds throughout the lifecycle of your circuit breaker.

  • Investment in your switchgear is preserved.

Mailing address

Siemens Industry, Inc.

7000 Siemens Road

Wendell, North Carolina 27591

United States