Molded Case Circuit Breakers for Low-Voltage Protection

Low-voltage distribution panels in industrial plants and commercial facilities require protective devices that can handle a wide range of load and fault conditions while meeting regional standards. Within this context, LS ELECTRIC America is presenting its Susol UL Molded Case Circuit Breaker (MCCB) series for applications from branch circuits to high-current feeders.

One platform covering broad current ranges
The Susol UL MCCB series is specified for current ratings from 15 A up to 1,200 A, allowing a single product family to be used across multiple protection levels in a distribution system. This range supports both smaller branch circuits and larger feeder protection within the same switchboard or panel design.

Breaking capacity is available up to 100 kA (Icu), with short-circuit service ratings (Ics) offered at 80% or 100% of Icu. These ratings define the breaker’s ability to interrupt fault currents and continue operating afterward, which is a key parameter when coordinating protection in facilities with high available fault levels, such as industrial manufacturing plants or large commercial buildings.

The UTE and UTS series include seven frame sizes, giving designers flexibility to match current rating, interrupting capacity, and panel space constraints.

Configurable protection for different system architectures
The Susol UL MCCB is available in both 2-pole and 3-pole versions, supporting single-phase and three-phase systems. This makes the series suitable for mixed installations where lighting, small power, and motor loads coexist within the same distribution infrastructure.

Trip unit options range from fixed and adjustable thermal-magnetic types (FTU, FMU, ATU, MCP) to electronic trip units (ETS, ETM, OCR). Thermal-magnetic units provide inverse-time overload protection and instantaneous short-circuit response using bimetal and magnetic mechanisms. Electronic trip units add adjustable long-time, short-time, and instantaneous settings, along with enhanced measurement and coordination capabilities. These features help engineers align protection curves across multiple devices, improving selectivity and reducing the risk of upstream outages during downstream faults.

Such flexibility supports use in industrial automation lines, process plants, commercial buildings, and other installations where load profiles and coordination requirements vary.

Compliance with North American and international standards
The Susol UL MCCB is certified to UL 489 and CSA standards for use in North American low-voltage distribution equipment. In addition, IEC 60947-2 CB certification supports use in systems designed for international markets, which is relevant for OEMs supplying equipment globally.

The platform also carries a Class 1E rating, indicating suitability for safety-related applications in nuclear power plants. This classification reflects additional qualification requirements for performance under specified environmental and operational conditions in critical infrastructure.

Protection design aligned with modern power systems
By combining multiple frame sizes, interrupting ratings up to 100 kA, and a wide selection of trip unit technologies, the Susol UL MCCB series is positioned for use in diverse low-voltage distribution scenarios. The platform supports coordinated protection strategies across industrial and commercial systems, where reliability, fault containment, and standards compliance are central design considerations within broader power distribution and electrical protection architectures.

www.lselectricamerica.com