J-Frame Circuit Breakers

More Information about J-Frame Circuit Breakers

A Square D J-frame breaker has a design that is compact and saves space, making it a great option when there isn't much of either. It is very easy to install and it doesn't require much maintenance. In fact, the mounting options are so simple to use—plug-on, bolt-on, or draw-out—that these breakers could almost be called foolproof. Because you can see when these breakers have been tripped, you can fix them in a hurry. And the reset mechanisms couldn't be simpler to use.

The J-frame breakers from Square D are built to last and perform in all sorts of environments, even the most demanding. The circuit breakers comply with the high bar set by the UL, CSA, and IEC. Used in both old and new applications, they offer the same level of dependability and performance.

FAQs 

Do PowerPact J circuit breakers provide thermal magnetic circuit protection as well as protect electrical systems from short circuit fault?

Yes, PowerPact J circuit breakers provide thermal magnetic circuit protection and protect electrical systems from short circuit faults.

Does a 3-pole circuit breaker have dual break rotating contacts as well as a continuous current rating and breaking capacity?

Yes, a 3-pole circuit breaker typically features dual break rotating contacts for improved arc interruption and possesses a continuous current rating as well as a specified breaking capacity to handle various fault conditions.

What is a Circuit Breaker?

There are two different types of technologies that are commonly used in circuit breakers. 

Magnetic Breakers

Magnetic Breakers are designed to react to short circuits or sharp spikes in voltage and current. The more current that passes through the breaker’s electromagnet, the stronger the magnet becomes. When the current exceeds the rating for that particular breaker, the magnetic force becomes strong enough that it will pull the contact back and disconnect it from the other contact, disconnecting power from the device.

Thermal Protection Breakers

Thermal Protection Breakers protect against a sustained overcurrent, or a higher current, for a longer period of time. Thermal protection uses a Bimetal strip that will bend the contacts away from each other to disconnect power. Thermal Magnetic Breakers are the most common type of circuit breakers. They combine magnetic technology to protect against short circuits or sharp spikes and thermal technology that protects against sustained overcurrent for a long period of time.