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QOU235VH Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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4 / 32 page 4 © 2005 Schneider Electric All Rights Reserved 09/2005 QOU Miniature Circuit Breakers and Switches Application Information Thermal Trip The thermal trip element of a circuit breaker is a root-mean-squared (rms) current sensing device. The thermal element, or bimetal, is constructed from metals with dissimilar rates of expansion bonded together. The thermal element responds to overloads by reacting to the heat generated both by the current flowing through the circuit breaker and by the heat contribution from ambient conditions. The bending force of the bimetal causes the circuit breaker to trip (see Figure 1). The deflection of the bimetal is predictable as a function of current and time. This is the inverse time tripping characteristic of the thermal element, i.e., the tripping time decreases as the magnitude of the current increases. Square D calibrates the thermal elements and they are not field-adjustable. The thermal trip elements are calibrated for 40° C (104° F) ambient temperature, per UL Standard 489 and CSA Standard C22.2 No. 5-02. Magnetic Trip The magnetic (instantaneous) trip element uses an electromagnetic assembly to trip the circuit breaker instantaneously (with no intentional delay) at or above a predetermined current value. During a short circuit of sufficient magnitude, the high-level current passing through the conductor rapidly increases the magnetic field of the electromagnet that attracts the armature. As the armature is drawn toward the electromagnet, it initiates an unlatching action and opens the circuit breaker contact (see Figure 2). Trip Indicator When the QOU miniature circuit breaker is tripped, the handle assumes a position between ON (I) and OFF (O) and the red Visi-Trip® indicator (A) appears in a window in the circuit breaker case. Reset the circuit breaker and Visi-Trip indicator by pushing the handle to OFF and then to ON. Figure 1: Thermal Tripping Figure 2: Magnetic Tripping Normal Conditions Thermal Trip Latch Current Out Current In Spring Circuit Breaker Contacts Bimetal Normal Conditions Normal Conditions Latch Current Out Current In Spring Circuit Breaker Contacts Armature Electromagnet Conductor |
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