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So essentially, an ACB/ICCB is used as almost the last line of defense during a fault. The breaker is designed to be mechanically very robust in order to resist the powerful mechanical forces which exerted during fault conditions, wile waiting as long as possible for coordinated downstream devices to trip first. ACBs typically have the facility to adjust or even disable the instantaneous trip in order to maintain protection coordination with downstream devices. Either term is describing a large low-voltage circuit breaker designed for high current applications up to about 6300A. etc.ĪCB Short for Air Circuit Breaker, the IEC term for what is called an Insulated Case Circuit Breaker (ICCB) in NEMA world. Devices that incorporate Short Circuit (magnetic instantaneous) trips, adjustable thermal (Overload) trips and a disconnecting means, specifically designed for motor loads, is called a Motor Circuit Protector by some manufacturers, a Motor Protective Switch (MPS) by others, a Motor Starter Protector (MSP) by others etc. In IEC world, a Motor Circuit Protector can sometimes mean a completely different device, although generally the MCP acronym is not used to avoid confusion. They are often mistakenly specified and used in user-built assemblies, but this is not acceptable in the NEC (US) and CEC (Canada). MCP A NEMA world acronym for Motor Circuit Protector, specifically describing a magnetic-only MCCB (no thermal trip elements) that is to be used STRICTLY as part of a factory assembled, listed and tested motor starter assembly. MCCBs are typically sealed units and cannot be serviced, although in larger sizes there are versions with interchangeable parts that can be replaced such as trip units and switch bodies. There are versions that are Current Limiting (CL) as well. MCCBs generally range from 15A to 1600A, with a few exceptions at either end, and generally start at 14kAIC but go up to 100kAIC for applications with high fault current capacity. Many rank and file electricians still are not familiar with that acronym because its widespread use in NEMA world is fairly recent. MCCB Was originally an IEC term meaning Molded Case Circuit Breaker, but has been very well adopted in NEMA world now, at least at the engineering level. MCBs / Supplementary Circuit Protectors are sealed units that can be neither maintained or repaired, they are throw-away devices. So in NEMA world, the acronym MCB now has contextual relevance. In recent years, many manufacturers have come out with special versions that do now meet the UL489 standards for circuit breakers, so the term MCB has taken on a dual meaning. In NEMA world, these devices entered under special rules adopted by UL (UL1077) and are called "Supplementary Circuit Protectors" because they did not meet the criteria already established for "circuit breakers" under UL489. In IEC world, it means "Miniature Circuit Breaker", typically a DIN rail mounted circuit breaker in a small format that is limited to 100A, and is intended for use in installations with low fault current capacity (under 25kA) unless protected by upstream fuses. MCB In NEMA world, this used to exclusively mean "Main Circuit Breaker", meaning the primary circuit breaker in a group or panelboard / switchboard. I will start off randomly and eventually reorganize it in alphabetic order. "IEC world" basically refers to most of the rest of the world that adheres to the standards put forth by the International Electotechnical Commission, who's manufacturers generally self-regulate and test. USA and Canada (and to a lesser extent, Mexico) where standards are developed by NEMA (National Electrical Manufacturers Association) and acceptance testing is done by UL. I am using two terms that need a little definition: "NEMA world" refers to North America, i.e.
MCCB CIRCUIT BREAKER FACTORY FREE
This is intended to be a work in progress, please feel free to make suggestions for additions or deletions. Thist hread will list the common terms ands provide brief descriptions to help untangle some of the confusion. In the world of Circuit Protection Devices, people tend to use a lot of abbreviations and acronyms that sometimes leave readers with confusion because they may be different from what they have been taught or picked up along the way.