Relectric Supply is a leading supplier of used and surplus circuit breakers. They are disassembled, cleaned and tested to meet industry standards. They also offer a warranty on their products. These devices protect underground electrical systems from overloads, short circuits and ground faults. They also minimize downtime, reducing the risk of fires and injuries.

We all rely on our circuit breakers to protect us from the damage that can be done by too much electricity. Basically, these devices work as the middle man between our homes and the power company to keep everything running smoothly. Without them, our houses would be overloaded with too much electricity and the wiring could burn down. For the most reliable and affordable vacuum circuit breakers, click here or explore our official marketplace.

Molded case industrial molded breakers (MCCBs) come in a variety of different shapes and sizes, but they all perform the same basic function. They interrupt current flow when they detect a problem, which can include overcurrent and short-circuit faults. They can also be used to protect against motor overloads and ground faults. They have an insulated housing made from molded glass-polyester material or thermoset composite resin. This material offers ruggedness and high dielectric strength. They're usually named for their frame designations, which indicate the maximum voltage and current ratings they can handle. Type K MCCBs, for example, are designed to trip when they reach 8-12 times their rated current in 0.04 to 5 seconds. This makes them ideal for commercial and industrial power systems that contain electric motors and large transformers. MCCBs are also often categorized by their trip curves, which illustrate the current levels that will cause them to open in various time frames.

Vacuum circuit breakers are a type of electrical circuit breaker that uses a vacuum to interrupt current. They have many advantages over other types of circuit breakers, including their ability to interrupt current in a short time and with little energy loss. They can also be used in high-voltage applications, such as those found in railway power stations or generators. This type of circuit breaker is relatively simple to build, with the design being separated into three parts: fixed contacts, moving contacts and an arc shield located inside the arc interrupting chamber. The outer envelope of the breaker is constructed of glass to help in the examination of the breaker from outside after operation. If the glass turns milky from its original silvery mirror shine, it means that the breaker is losing its vacuum. When the arc occurs in a vacuum circuit breaker, it is quickly extinguished due to the vacuum’s high dielectric strength. This is because the arc is interrupted by metal oils that have been ionized in the contact. These ions can be pulled away from the surface of the contact and the arc will disappear immediately after the current interruption. This makes vacuum circuit breakers ideal for capacitor switching and for regulating low-voltage levels.

Just like molded case circuit breakers (MCCB) and vacuum circuit breakers, air breakers have a mechanical assembly that includes a charging spring that's used to close the main contacts when there's an electrical fault. In addition, they have an arc quenching medium that is a mixture of argon and nitrogen. They have both magnetic and thermal tripping mechanisms that detect abnormal current conditions and start the arc interruption process. They are designed to quickly handle massive fault currents, which protects equipment from damage and minimizes downtime due to short circuits and overcurrents.