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QOU235VH Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers |
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QOU235VH Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers |
6 / 32 page 6 © 2005 Schneider Electric All Rights Reserved 09/2005 QOU Miniature Circuit Breakers and Switches Application Information Catalog Numbers Square D brand circuit breakers are ordered by a catalog number that includes the circuit breaker family, description, number of poles, amperage rating and suffix. Ratings for QOU Miniature Circuit Breakers When designing an electrical distribution system, overcurrent protective devices are generally selected based on performance requirements. Factors influencing this selection include system voltage, continuous current, interrupting rating and frequency. QOU circuit breakers are selected by their ratings. A circuit breaker’s rating must meet or exceed the parameters of the electrical system on which they are used. Voltage Rating A circuit breaker can be rated for alternating current (ac) or direct current (dc) or both. The established voltage rating of a circuit breaker is based on design parameters such as clearance of current carrying parts and dielectric withstand tests both through air and over surfaces. Voltage ratings indicate the maximum voltage for the electrical system on which the circuit breaker can be applied. The circuit breaker must have a voltage rating greater than or equal to the system voltage. When a circuit breaker clears an overcurrent, it does so in two steps: First, the current sensing system identifies the overcurrent and releases the tripping mechanism. This results in a parting of the contacts. Then the circuit breaker must extinguish the voltage arc across the contacts. If the circuit breaker has the correct voltage rating, it can efficiently extinguish this voltage arc. QOU miniature circuit breakers are rated in the following UL 489 voltages, as shown in Table 3: • 120/240 Vac • 240 Vac • 48 Vdc • 60 Vdc • 277 Vac for QYU, UL 1077 recognized supplementary protector only (not a branch circuit breaker) Table 2: Catalog Numbers Typical Catalog Number: QO U 2 30 H 2100 QO Miniature Circuit Breaker Family Description U – Unit Mounted (Lugs on Both Ends) No. of Poles 1 – 1-pole 2 – 2-pole 3 – 3-pole Ampere Rating 10–125 Ampere Rating 00 = 60 A, 000 = 100 A, and 0001 - 125 A QOU Switch Rating 1- and 2-pole 2-pole 3-pole No Letter-Standard 120/240 Vac Rating VH - 22,000 AIR No Letter - 240 Vac Rating VH - 22,000 AIR H-240 Vac Rating VH - 22,000 AIR Suffix XXX (i.e., 2100) - Indicates Factory-installed Accessory (See page 12) |
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