The method of calculating panel Short-Circuit Current Rating based on UL 508A supplement SB can be quite confusing.  The award-winning OSCAR™ compliance software can calculate panel withstand ratings for marking based on component information and the methodology from UL 508A supplement SB.

If you have worked through your panel design and find your SCCR needs improvement, contact the Cooper Bussmann engineering services team for a design review. We guarantee our panel design and review service for UL508A Supplement SB pre-certification.  To contact our engineering team click here.

The Compact Circuit Protector or CCP offers an unprecedented 200kA short-circuit current rating (SCCR), using just 1/3 of the space of equivalent rated circuit breakers and 2/3 the space required by a traditional fusible switch.  The CCP also retains a best-in-class full voltage rating of 600Vac.

This data sheet contains a combination of application material for terminal and power distribution blocks along with detailed product specifications.  An all-in-one document for information on Cooper Bussmann PDBs and Terminal Blocks with High SCCR Ratings.

When calculating panel ratings overcurrent protective devices can seriously limit the overall withstand.  Using branch and feeder protective devices with high short-circuit current ratings can help raise the panel rating.

Due to the low default withstand of Power Distribution Blocks they can often be a limiting factor to a high panel rating.  To address this issue Cooper Bussmann has manufactured a selection of PDBs with 100 & 200kA withstand ratings.

IP20 Finger-Safe Power Distribution Blocks with high SCCR can help to raise assembly withstand ratings and increase worker safety.