A circuit breaker is a device designed to open and close a circuit by nonautomatic means and to open the circuit automatically on a predetermined overcurrent, without damage to itself when applied within its rating. These devices are designed to provide service-entrance, feeder or branch-circuit protection in accordance with ANSI/NFPA 70, National Electrical Code (NEC).
These critical devices are intended for use with certified enclosures, or as part of other certified equipment, or without enclosures where acceptable. Investigation of a certified replacement circuit breaker involves only the circuit breaker and associated parts. The end application or any series combination application has not been investigated.
A supplementary protector is a manually resettable device designed to open the circuit automatically on a predetermined value of time versus current or voltage within an appliance or other electrical equipment. It is permitted to be provided with manual means for opening or closing the circuit. They are not intended to provide branch circuit overcurrent protection required by ANSI/NFPA 70, NEC.
We evaluate molded-case circuit breakers to the following Standards for compliance and safety:
- U.S. – UL 489 Molded-Case Circuit Breakers, Switches and Enclosures
- UL 489A For Use in Communications Equipment
- UL 489B Photovoltaic
- UL 489C Wind Turbines
- UL 489D US Naval Commercial-Off-the-Shelf (COTS) Designated Molded-Case Circuit Breakers and Accessories for Use on Non-Nuclear Naval Combatant Ships
- UL 489F Battery Power Supplies
- UL 489G 650-1,000 Volts AC; 650-1,500 Volts DC
- UL 489H Direct Current Micogrids
- U.S. – UL 1066 Power Circuit Breakers
- ANSI/IEEE C37.13
- ANSI/NEMA C37.50
- Canada – CSA C22.2 NO. 4
- International – IECEE CB Certificate/Test Report - IEC 60947-2
Areas of expertise
We provide services for the following types of circuit breakers:
- Molded-case circuit breakers for PV systems and other DC applications
- Molded-case circuit breakers for communication use
- Ground-fault circuit breakers
- Surge protective circuit breakers
- Arc-fault circuit breakers
- Supplementary protector
- U.S. – UL 1077 The Standard for Supplementary Protectors for Use in Electrical Equipment
- Canada – CSA-C22.2 No. 235
- Circuit breakers for use with battery power supplies and for use in 650 - 1000 volts AC and 650 – 1,500 volts DC application
- Medium voltage circuit breakers for use in metal-clad and metal-enclosed switchgear
- End-product applications and requirements
- EMC/wireless certification
We can simultaneously provide Global Market Access solutions for the UL Mark in North America, as well as other certifications for markets around the world. Our global network of expert engineers helps you understand the various national and global requirements for your specific market application. One certification process allows you to benefit from faster speed to market. This streamlined and accelerated process saves time and money through a well-proven global certification program. We can also concurrently offer wireless and EMC services related to circuit breakers.
Our proven expertise in safety science and engineering enables us to serve the entire circuit breaker industry, from simple residential circuit breakers to new and innovative circuit breakers for direct current (DC) microgrids. Our extensive, flexible service portfolio covers research and development, Global Market Access, installation and end use.