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Re: AF and AT breaker notation Frame rating and trip rating are often different, although often the same. Adjustable breakers certainly are an example. The frame rating is a maximum rating of the based on the design of the particular type of breaker, and the trip rating is some multipler, 1 or less, that the breaker is set to trip at.
There is a definition in Article 100, but essentially, if there is an accidental short circuit, the breaker will experience very high current for a short period of time and the interrupting rating is the tested conditions that the breaker has been put through to be sure it opens the circuit rather than catastrophically failing.
\$\begingroup\$ No circuit breaker, fast or slow, can definitely stop the next one in the chain from tripping. If you apply a solid short circuit, you can trip all the way to the street. A massive short will draw several kA, and all the breakers in the row will start to trip.
Goal: Install (1) 15A Tandem Breaker for (2) Existing 15A Networked Circuits in order to create (1) new space for (1) New 20A Circuit The existing panel is maxed out breaker space wise. (1) 15A Tandem breaker will be installed per the wiring diagram above in 1 of 4 approved locations at the bottom of the busbars.
However, they are designed and rated to operate correctly (trip cleanly) only up to a certain voltage - using a 32 volt breaker on a 120 volt circuit may result in the breaker arcing when it trips (likewise, using a DC-rated breaker on an AC circuit, or vice versa, may result in faulty operation.)
Re: Circuit breaker AIC ratings Friebel, the Bussmann SPD you are talking about is available on line. By the way, the AIC that is marked on circuit breakers is a rating. In the smaller sized circuit breakers, if they received an actual bus shot at their rating, they would likely fail to open and destroy themselves.
\$\begingroup\$ Is the breaker a part of the device or no? Very important distinction. For a branch circuit breaker, you'd end up with a 15A panel breaker, for relays and specialized breakers, lower, but usually smaller breakers are part of a device. It's also important to make the distinction between work and a personal project.
indicate otherwise. If, however, the circuit breaker is mounted so that the handle is operated vertically rather than rotationally or horizontally, the up position of the handle should be in the ‘‘on’’ position. Line and load markings on a circuit breaker are intended to limit connections thereto as marked.
This MEN link reduces the resistance of any electrical fault to a protective earth (say, from the active to the equipment case, such as a knife falling into a toaster such that the toaster case becomes "live"), and means that the circuit breaker will trip much faster. \$\endgroup\$ –
AF/AT are the same concept for Circuit Breakers, except Amp Frame / Amp Trip. Frame sizes vary a lot more from mfrs to mfr, so some have 100AF, some are 125AF, some only start at 150AF, etc. then in larger frames, some mfrs have dropped some old traditional frame sizes such as 600AF because their newer 800AF is the same physical size anyway.