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Selective main line circuit breaker
Selective main line circuit breakers, also known as selective main switches or SLS (Selective Line Switches), are critical components in electrical distribution systems designed to ensure selective coordination between upstream and downstream protective devices. These devices are typically rated for high short-circuit currents, with breaking cap...
Selective main line circuit breakers, also known as selective main switches or SLS (Selective Line Switches), are critical components in electrical distribution systems designed to ensure selective coordination between upstream and downstream protective devices. These devices are typically rated for high short-circuit currents, with breaking capacities ranging from 25kA to 150kA at 400V AC, and are available in 3-pole (3P) and 4-pole (4P) configurations. They operate at rated currents from 63A up to 6300A, with adjustable overload and short-circuit protection settings (L, S, I, G curves) to achieve full selectivity. The units are designed for fixed or withdrawable mounting in low-voltage switchgear and controlgear assemblies, complying with IEC 60947-2 standards.
These circuit breakers are primarily installed in main distribution boards (MDBs), substations, and industrial power centers where continuity of service is paramount. They are essential in sectors such as manufacturing plants, data centers, commercial buildings, hospitals, and renewable energy installations (e.g., solar farms and wind turbines). Their selective operation ensures that only the faulty circuit is isolated, minimizing downtime and protecting critical loads. They are also used in utility networks and large-scale infrastructure projects like airports and railway systems.
Key subcategories include fixed-type selective main breakers, withdrawable units, and electronic trip unit variants. Common article codes follow patterns like SLS-1600A-3P-65kA or SLS-3200A-4P-100kA, where the number indicates rated current, poles, and breaking capacity. Specific models include the SLS-630A-3P-50kA for medium loads and SLS-4000A-4P-150kA for heavy industrial applications. These codes often incorporate suffixes for trip unit type (e.g., -E for electronic, -T for thermal-magnetic) and accessories like shunt trips or undervoltage releases.
Partnering with Electric Automation Network ensures access to genuine selective main line circuit breakers with real-time pricing and global express shipping. Our team of specialized electrical engineers provides technical support for selection, coordination studies, and installation guidance. Each product includes detailed documentation, including time-current curves and wiring diagrams, to simplify integration into your system. We offer tailored solutions for complex projects, ensuring compliance with local and international standards.
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