![]() They are used in applications where circuit loading is light and/or noncontinuous, as in residential applications. Square D QOT tandem circuit breakers are manufactured so two one-pole, thermal-magnetic circuit breakers occupy only one QO pole space. ![]() QO and QOB circuit breakers are rated for use in the following voltage systems:Ĥ8 Vdc (10–70 A for 1 and 2 pole circuit breakers, 10–60 A for 3 pole circuit breakers) If the circuit breaker has the correct voltage rating, it can efficiently extinguish this voltage arc. The circuit breaker must then extinguish the voltage arc across the contacts. This results in a parting of the contacts. First, the current sensing system identifies the overcurrent and releases the tripping mechanism. When a circuit breaker clears an overcurrent, it is done in two steps. The circuit breaker must have a voltage rating greater than, or equal to, the system voltage. The circuit breaker can be reset by pushing the handle to OFF and then to ON. Trip indication immediately distinguishes the circuit from any other circuit which is merely in the on or off position. The Visi-Trip indicator is only visible when the circuit breaker has tripped. When the circuit breaker has tripped, the handle assumes a center position and the red Visi-Trip indicator appears in a window in the circuit breaker case. QO circuit breakers have Visi-Trip® trip indication, which provides a visual indication that the circuit breaker has tripped and interrupted the circuit. Each pole has an individual thermal-magnetic trip element calibrated for 40☌ ambient temperature. The tripping mechanisms in two-and three-pole circuit breakers operate such that an overcurrent on any pole of the circuit breaker will cause all poles of the circuit breaker to open simultaneously. QO circuit breakers have an overcenter, trip-free toggle mechanism with quick-make, quick- break action and positive handle indication. Plug-on QO circuit breakers are for use in QO loadcenters, NQ and NQOD panelboards, OEM mounting bases, and Speed-D® switchboard distribution panels. QO® (plug-on) one-, two- and three-pole thermal-magnetic circuit breakers provide overcurrent protection and switching on ac and dc systems. Plug-on QO circuit breakers are for use in QO load centers, NQ and NQOD panelboards, OEM mounting bases, and Speed-D® switchboard distribution panels. Square D also offers the HomeLine series which is NOT interchangeable with the QO series. Some electricians wear safety glasses whenever working with electrical components and devices.The Square D QO, QOT, QO-AFI, and QO-GFI are plug-on type one-, two- and three-pole thermal-magnetic circuit breakers provide overcurrent protection and switching on ac and dc systems. Although the possibility is remote, there is a chance of explosion in a circuit breaker panel, and standing to the side and looking away is a safety measure designed to protect vision. All branch circuits in the panel will now be shut off.Ĭareful electricians always stand to the side of the service panel when turning a circuit breaker on or off, and they turn their eyes away from the panel until the transition is made. This may now put you in the dark, so make sure you have a flashlight handy, if necessary. Locate the main circuit breaker and flip it to the OFF position. ![]() Professional electricians sometimes replace individual circuit breakers without shutting the main power supply off, but for an amateur doing this work, it is best to shut off the entire power supply, which interrupts the power to the two hot bus bars running down through the service panel. The Spruce Home Improvement Review Board. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |