Test Your Equipment in Our High Voltage Lab

Our High Voltage Test Laboratory offers mechanical and environmental testing and certification for low- and medium-voltage electrical equipment.

Our Specialized Test Equipment Evaluates and Certifies Electrical Equipment and Apparatus

Available for testing your equipment, our high voltage laboratory is equipped with the specialized test equipment and measuring instrumentation needed to evaluate and certify low- and medium-voltage electrical equipment such as circuit breakers, switchgear, insulators, transformers, power cables, arrestors, capacitors, pole line hardware, bucket trucks, vacuum interrupters, etc. Additionally, we have the capability of performing a wide variety of mechanical and environmental tests.

Our experienced staff will work with you to develop the appropriate tests for your equipment. We can also assist in the redesign and modification of previouslycertified or nevercertified electrical equipment that is used in lifeextension upgrades. Engineering and technical services are available to assist in certification or design tests for all types of electrical insulating systems. Problem mitigation is our specialty. 

testing and maintenance

Your One Stop for Electrical, Mechanical, and Environmental Testing and Certification

Our High Voltage Test Laboratory is your one stop for the electrical, mechanical, and environmental testing and certification of your low- and medium-voltage electrical equipment and apparatus. Tests are performed to ANSI, IEEE, AEIC, NEMA, CEA, IEC, ASTM, MIL, and other national and international standards. Calibration of all test equipment and measuring instruments is traceable to National Institute of Standards and Technology (NIST). Let our experts work with you regarding your electrical, ​mechanical,​ and environmental testing and certification requirements. 

Apparatus Tested
  • Circuit Breakers
  • Contactors
  • Switchgear
  • Insulators
  • Transformers
  • Power Cables
  • Vacuum Interrupters
  • Fuses
  • Bus Duct
  • Surge Arrestors
  • Lightning Arrestors
  • Capacitors
  • Bucket Trucks
  • Pole Line Hardware
  • Dielectric Materials/Insulating Materials (Solid, Liquid, Gas)
  • And More!
Testing Capabilities
  • Partial Discharge
  • Radio Interference Voltage – RIV
  • Visual Corona
  • Dry Lightning Impulse Critical (Flashover and Withstand)
  • Chopped Wave Impulse
  • Dielectric Breakdown – Dielectric Withstand (AC Short-Term & Long-Term Withstand)
  • Temperature Rise
  • Vibration
  • Accelerated Life
  • Environmental
  • Mechanical Endurance
  • Speed, Velocity & Motion
  • Seismic
Test Equipment
  • Impulse Generator | 500 kV/6.25 kJ
  • Digital Impulse Voltage Measuring System
  • AC Dielectric Test System | 200 kV
  • Partial Discharge Detector | > 1pC
  • Faraday Cage
  • AC/DC Current Supply | 6000 A
  • AC/DC Power Supply | 0-1000 AC/DC 100 kVA
  • DC Dielectric Test Set | 150 kV
  • Magnetron Vacuum Interrupter MAC Tester
  • Low Resistance Micro-Ohmmeter | 200 A
  • High-Accuracy Gaussmeter
  • High-Speed Camera
  • Vibration Analyzer
  • Circuit Breaker Timer
  • Molecular Vacuum Pump
  • Environmental Testing Chamber
  • Numerous Miscellaneous Test Sets and Measuring Instruments


If you have vacuum interrupter failure, need equipment testing, or would like to discuss your requirements, contact us for immediate assistance.

Knowledge Base

Keep up with the latest information from Vacuum Interrupters and developments from across the electrical industry.


The Group CBS family of electrical field service, service shop, and power products companies offer everything you need for manufacturing, testing, parts, repairs, and engineering services.

Manufacturing & Repair

Circuit Breaker Sales offers in-house manufacturing of obsolete replacement components for all types of electrical equipment as well as repair and life-extension services.


Group CBS has tens-of-thousands of renewal and replacement parts for your power distribution equipment, including vintage relays and controllers.

Electrical Safety Solutions

CBS ArcSafe is the electrical industry’s leader for remote racking and remote switching solutions that keep technicians safe.

NETA-Certified Field Services

CBS Field Services provides electrical testing and maintenance, commissioning, arc flash studies and other power engineering services.

After Hours or Emergency Support Available 24/7 888.395.2021