What is QO circuit breaker?

These “Qwik-Open” or QO breakers are the fastest opening breakers in use in the industry. They reportedly open after just one full power cycle of a 60 Hz AC line (about 1/60th of a second). These breakers feature a visual trip indicator and make it easy to quickly spot the tripped breaker in the panel.

What is upstream circuit breaker?

The upstream circuit breaker A sees a limited short-circuit current compared to its breaking capability, but this current induces a repulsion of the contacts. As a result, the arcing voltage increases the current limitation. However, the arc energy is not high enough to induce the tripping of the circuit breaker.

How does an EPD breaker work?

An EPD compares outgoing load currents with returning currents to determine if there is leakage of current to ground. If it detects a ground fault greater than 30 mA, the EPD will trip and display the “red flag” of the Visi-Trip® indicator.

What is upstream and downstream breaker?

Upstream – the circuit that feeds the circuit breaker. Downstream – the circuit that is fed and controlled/protected by the circuit breaker. When you trip the breaker (or when you switch it to OFF) the Downstream side is de-energised while the upstream side remains energised.

What is upstream in electrical circuit?

downstream. The terms are used in the context of a single device and electrical box, so that the wires that deliver power into the box are described as the line wires, the upstream wires, or the incoming wires, while the wires passing onward to other devices are described as load, downstream, or outgoing wires.

What are three types of breakers?

The three main types of circuit breakers are standard, GFCI and AFCI. Some models have dual functionality.

Is Square D QO better than homeline?

2 Answers. Homeline is the “price competitive” model from SquareD, QO is the higher quality panel. The difference is probably mostly due to historical reasons given all the consolidations in the electrical manufacturing industry.

Are Square D Homeline and QO breakers interchangeable?

Square D QO breakers are compatible with QO breaker boxes and CSEDs. Homeline circuit breakers are built with the same Square D brand quality you have come to expect at a price that makes them the best value in their class. All QO circuit breakers are equipped with the exclusive Visi-Trip indicator.