ABB Molded Case Circuit Breakers
ABB Molded Case Circuit Breakers (MCCBs) provide robust, configurable overcurrent protection for demanding industrial, commercial, and utility applications. Designed for use in systems up to 6,000 amps at 600 volts, ABB MCCBs offer the reliability, performance, and safety expected from a global leader in electrical protection technology. These UL1066-approved breakers are available in 3-pole and 4-pole configurations, with advanced thermal-magnetic and electronic trip units for precise fault detection. MCCBs automatically trip to protect circuits and equipment from overload or short-circuit conditions, ensuring safe operation and minimal downtime. Overload protection is achieved through a thermal mechanism featuring a bimetallic strip that bends under heat, releasing a latch to open the circuit after a brief delay. For short-circuit protection, an instantaneous electromagnetic trip mechanism detects excessive current and immediately interrupts power flow to prevent damage.
ABB SACE Tmax Series – Tmax T & Tmax XT MCCBs - ABB’s SACE Tmax T Series offers protection up to 3200A and is available in both fixed and plug-in versions (sizes T4 and T5). With interchangeable thermal-magnetic and electronic trip units, installations can be easily upgraded without replacing the entire breaker - delivering cost-effective scalability and flexibility. The SACE Tmax XT Series expands this performance, offering seven frame sizes and protection ratings up to 1600A. These MCCBs integrate advanced electronic trip units featuring Early Fault Detection and Prevention (EFDP) algorithms, ensuring enhanced selectivity, system reliability, and fault tolerance.
Shop ABB MCCBs at RSP Supply and experience configurable, high-performance breakers designed to meet the highest industrial safety standards.
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.