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QOU245VH Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
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QOU245VH Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers |
7 / 32 page QOU Miniature Circuit Breakers and Switches Application Information 7 09/2005 © 2005 Schneider Electric All Rights Reserved Interrupting Rating The interrupting rating of a circuit breaker is the highest current at rated voltage that the circuit breaker is intended to interrupt under standard test conditions. Circuit breakers must be chosen with interrupting ratings equal to or greater than the maximum available short-circuit current at the point where the circuit breaker is applied in the system (See Table 3). Continuous Current Rating The continuous current rating of a circuit breaker is defined by the National Electrical Manufacturers Association (NEMA) as: “The maximum direct current or rms current, in amperes, at rated frequency which a device or assembly will carry continuously without exceeding the specified limits of observable temperature rise.” Sometimes referred to as the ampere rating or handle rating of the circuit breaker, the continuous current rating relates to the system current flow under normal conditions. UL Standard 489 states that circuit breakers must carry 100% of their continuous current rating indefinitely (without tripping) at 104° F (40° C) in free air. QOU circuit breakers should be applied, per the NEC, to carry 80% of their continuous current ratings in the intended enclosure. The continuous current rating is indicated on the handle of each circuit breaker. See Table 1. Switching Duty The switching duty (SWD) listing applies only to 15 A and 20 A circuit breakers rated at 277 Vac or less. The circuit breakers are subjected to specified temperature rise tests at predetermined periods during the endurance operations. Table 3: Interrupting Rating Circuit Breaker Type No. of Poles Ampere Rating UL Listed Interrupting Rating—RMS Sym. Amperes AC Volts DC Volts1 1 DC ratings do not apply to circuit breakers rated for 10 A 120/240 240 277 48 60 QOU 1 10–30 NA NA 5 kA 10–70 10 kA NA NA 5 kA NA 80–100 10 kA NA NA NA 5 kA 2 10–70 10 kA NA NA 5 kA NA 80–125 10 kA NA NA NA 5 kA 3 10–70 NA 10 kA NA 5 kA NA 80–100 NA 10 kA NA NA 5 kA QOU-H 2 15–30 NA 10 kA NA 5 kA NA QOU-VH 2 15–60 22 kA NA NA 5 kA NA NA = Not Applicable |
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