Comprehensive Testing and Certification for Low-, Medium-, and High-Voltage Circuit Breakers
Circuit breakers are fundamental to the safety and reliability of electrical power systems. From commercial buildings and industrial facilities to utility substations, renewable energy projects, data centers, and critical infrastructure, circuit breakers must safely interrupt fault currents, protect electrical equipment, and operate reliably throughout their service life.
Intertek provides comprehensive testing, certification, and engineering services for low-, medium-, and high-voltage circuit breakers. Our experts help manufacturers validate safety, performance, endurance, and regulatory compliance throughout product development, certification, and production.
Whether you are introducing a new breaker platform, expanding into global markets, or updating an existing design to meet evolving industry standards, Intertek provides the technical expertise and testing capabilities to help reduce certification risk and accelerate market access.
Low-Voltage Circuit Breaker Testing
Low-voltage circuit breakers protect electrical systems in commercial, industrial, residential, and critical power applications. Intertek supports manufacturers with testing and certification for a broad range of low-voltage protective devices, helping demonstrate compliance with North American and international requirements.
Products We Test
- Molded Case Circuit Breakers (MCCBs)
- Miniature Circuit Breakers (MCBs)
- Air Circuit Breakers (ACBs)
- Insulated Case Circuit Breakers (ICCBs)
- Residual current operated circuit-breakers (RCCB, RCBO)
- Arc Fault Detection Device (AFDD)
- Ground-Fault Circuit-Interrupters (GFCI)
- Supplementary Protectors
- Motor Protection Circuit Breakers
- DC Circuit Breakers
Testing Services
Our capabilities include:
- ETL Certification
- CB Certification
- Type testing
- Short-circuit interrupting capacity
- Temperature rise testing
- Dielectric withstand testing
- Insulation resistance
- Mechanical endurance
- Electrical endurance
- Trip calibration and operating characteristics
- Contact resistance
- Construction review
- Factory inspections
Standards Supported
Intertek supports testing and certification to applicable standards including:
- UL 489, UL 1077, UL 943 series
- IEC 60947 series, IEC 60898, IEC 61008, IEC 61009, IEC 62606
- CSA requirements
- NEMA specifications
Learn how to develop a successful UL 489 certification strategy for molded-case circuit breakers used in today's power systems.
Medium-Voltage Circuit Breaker Testing
Medium-voltage circuit breakers are essential components in power distribution systems serving utilities, industrial facilities, renewable energy installations, mining operations, and large commercial infrastructure. These products must withstand demanding electrical and mechanical conditions while maintaining reliable operation throughout their service life.
Intertek provides independent testing and certification services that help manufacturers verify product performance, demonstrate compliance, and support utility and customer acceptance.
Products We Test
- Vacuum Circuit Breakers
- Metal-Clad Switchgear Breakers
- Metal-Enclosed Circuit Breakers
- Distribution Circuit Breakers
- Utility Circuit Breakers
- Generator Circuit Breakers
Testing Services
Capabilities include:
- Short-circuit interruption testing
- Momentary withstand current
- Close-and-latch testing
- Short-time withstand current
- Dielectric testing
- Insulation resistance
- Mechanical endurance
- Electrical endurance
- Contact resistance
- Timing and travel analysis
- Temperature rise testing
- Environmental conditioning
Standards Supported
Testing may be performed to:
- ANSI C37 Series
- IEEE C37 Series
- IEC 62271-100
- Utility specifications
Customer performance requirements
High-Voltage Circuit Breaker Testing
High-voltage circuit breakers are critical assets within transmission networks and utility substations, where reliable interruption of high fault currents is essential to maintaining grid stability and system reliability.
Intertek supports manufacturers with comprehensive testing programs that evaluate breaker performance under demanding electrical, environmental, and mechanical operating conditions.
Products We Test
- Live Tank Circuit Breakers
- Dead Tank Circuit Breakers
- SF₆ Circuit Breakers
- Vacuum High-Voltage Circuit Breakers
- Generator Circuit Breakers
- Transmission Circuit Breakers
Testing Services
Our capabilities include:
- High-power testing
- Fault interruption testing
- Short-circuit performance
- Dielectric withstand
- Lightning impulse testing
- Switching impulse testing
- Mechanical endurance
- Electrical endurance
- Temperature rise
- Timing analysis
- Seismic qualification
- Environmental testing
Standards Supported
Intertek supports testing to:
- IEEE C37 Series
- IEC 62271 Series
- Utility specifications
- International transmission requirements
Engineering & Certification Support
Intertek provides engineering support throughout the product development and certification lifecycle, helping manufacturers identify potential issues early and prepare for successful certification.
Services include:
- Pre-compliance evaluations
- Engineering design review
- Failure analysis
- Product troubleshooting
- Regulatory guidance
- Test plan development
- Witness testing
- Design verification
- Ongoing certification programs
- ETL Certification
Why Choose Intertek for Circuit Breaker Testing?
Intertek combines decades of experience in electrical power equipment testing with a global network of laboratories and technical experts. Our integrated capabilities support manufacturers throughout every stage of product development—from initial design verification through certification and ongoing production.
Our services help manufacturers:
- Demonstrate compliance with North American and international standards
- Validate product safety, reliability, and performance
- Reduce certification delays through early engineering support
- Simplify global market access
- Meet utility, AHJ, OEM, and customer requirements
- Access complementary testing services including switchgear, transformers, environmental, EMC, and power system equipment evaluations
Related Power Equipment Testing Services
Manufacturers often require testing across complete electrical power systems. Intertek also provides testing and certification for:
- Switchgear
- Power Transformers
- Distribution Transformers
- Busway Systems
- Protective Relays
- Reclosers
- Power Distribution Equipment
- Grid Code Compliance
- Battery Energy Storage Systems (BESS)
- Renewable Energy Power Equipment
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ETL Listed Mark | Product Certification
As a recognized NRTL, Intertek offers flexible and efficient product testing and certification pathways through our ETL Certification program and our ETL Listed Mark, designed to help manufacturers bring products to market faster.