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Streamlining panel design equals higher SCCR
Panels with higher AIC / SCCR ratings provide superior safety, helping protect employees and equipment while avoiding production losses and scrap. OEM machine builders and panel builders can pursue several paths to achieve those higher ratings.
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4 Steps to calculate short circuit ratings
Short-circuit current ratings (SCCR) are a critical specification when designing industrial control panels. Determining the appropriate SCCR actually requires no calculations. Instead, there is a simple, four-step process to follow. The UL Standard for Safety for Industrial Control Panels, UL 508A, includes instructions for calculating a panel’s short circuit current rating (SCCR ), but many people have trouble working through that process. Determining an accurate SCCR is essential to ensuring the safety of people who work on or around power equipment.
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Throw away your relays
If you appreciate the wisdom of combining the fax, scan, and copy functions into a single device, the benefits of combining the function of relays and meters in your breakers should be crystal clear. Learn more about the benefits of smarter breakers.
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Power circuit breaker ratings explained
When selecting the right low voltage power circuit breaker for an application, it is important to consider both short-circuit current ratings and short-time current ratings. Understanding these performance characteristics will help you choose between the various circuit breaker designs. A circuit breaker is selected based on its electrical ratings to serve a particular purpose in each application, proper selection of the circuit breaker is essential for the safe and correct operation of the electrical system. Two important ratings to consider are; short-circuit current rating (this is commonly referred to as the maximum interrupting rating) and the short-time current rating. In this paper, we will discuss these circuit breaker ratings and how they can affect the protection and selective coordination of the system.
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Current limiting circuit breakers
Explore the significant performance advantages offered by current limiting circuit breakers as compared to standard non-current limiting circuit breakers. Current-limiting circuit breakers have been around for a long time but recent advances by ABB in currentlimiting circuit breaker technology and performance have changed the rules for circuit protection of sensitive power electronics. Variable frequency drives, soft starters, inverters and other equipment using sensitive power electronic components often required the use of current-limiting fuses for proper short circuit protection.
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Circuit breaker ratings: Short-circuit current rating and short-time current ratings
Low-voltage power circuit breakers have specific electrical ratings that an engineer uses when selecting the right circuit breaker for an application. These short-circuit current rating and short-time current ratings define different circuit breaker performance characteristics. A good understanding of these ratings allows an electrical engineer to make an informed decision when choosing between various circuit breaker designs.
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UL short circuit current ratings for combination motor controller components
UL ratings spreadsheets cover the application of individual components, including a disconnecting means, an overcurrent protective device, motor controller and motor overload protection, and as a combination motor controller with specified ratings, including a short-circuit current rating (SCCR).
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