UL Listed Switchgear
UL 891 Switchgear: A Critical Backbone for Microgrids
UL 891-rated switchgear plays a foundational role in enabling safe, flexible, and code-compliant power distribution within modern microgrids. As decentralized energy systems grow in complexity and scale, the need for dependable switchgear that meets rigorous standards becomes paramount.
Safety & Regulatory Compliance UL 891 is the benchmark standard for dead-front switchboards, ensuring personnel safety by preventing exposure to live electrical components. Adopting UL 891 switchgear ensures alignment with the National Electrical Code (NEC) and UL safety guidelines, which are essential for meeting utility interconnection requirements and obtaining local authority approvals.
Reliable Power Distribution Across Diverse Sources Microgrids often integrate multiple distributed energy resources (DERs)—including photovoltaics, battery energy storage systems (BESS), and generators—each with different characteristics. UL 891 switchgear is engineered for high configurability, supporting source switching, load segmentation, and robust fault isolation across a range of variable voltages and load conditions.
Advanced Protection & Coordination
Coordinating protection in hybrid or islanded microgrid modes is a complex task. UL 891 switchgear supports the integration of circuit breakers, protective relays, and monitoring systems, enabling precise fault detection and coordination to prevent cascading failures and minimize downtime.
Seamless Islanding & Grid Reconnection For microgrids to function autonomously or in tandem with the utility grid, seamless transition capabilities are critical. UL 891 switchgear can interface with EMS/SCADA platforms and programmable logic controllers (PLCs), facilitating real-time control during islanding and reconnection events. Scalability & Modularity for Evolving Systems As microgrids scale, adding loads, distributed energy resources (DERs), or energy storage, UL 891 switchgear provides modularity and adaptability. This enables upgrades or reconfigurations without requiring an overhaul of the entire electrical distribution infrastructure, making it a future-ready investment.
HECSY is a specialized manufacturer of custom UL 891 Switchboards and Switchgear, catering to the industrial and commercial sectors that require fast, reliable, and code-compliant power solutions. Their products are engineered to meet UL 891 safety and performance standards, ensuring high reliability for demanding and time-sensitive projects.
HECSY offers configurable options, including NEMA 1, 3R, and 3RX enclosures, as well as utility metered and non-metered setups, walk-in and non-walk-in enclosures, and custom sheet metal and bus fabrication. Their systems support up to 4,000 amps, operate at voltages of up to 600 Vac or 250 Vdc, and provide fault current ratings of 65 kAIC (standard), with optional upgrades to 100 or 200 kAIC. Switchboards can also include 100% rated silver-plated copper buses, fully rated buses meeting density requirements, and are ready to integrate with UL-listed circuit breakers, fusible switches, transfer switches, HECSY Smart metering, and automation.
A hallmark of HECSY's service is its engineered-to-order approach. It begins with an in-depth consultation to understand each client's unique electrical needs, including compliance, future scalability, and custom configurations such as front or side cable access. This approach allows HECSY to design high-performing and efficient systems that are future-ready and tailored for minimal operational disruption.
HECSY ensures quality and reliability by utilizing components from trusted brands, including ABB, Eaton, Siemens, Schneider, and LS America. Their large in-house inventory bypasses traditional supply chain delays, enabling faster production and delivery times. This responsiveness is particularly valuable for projects that operate under tight deadlines.
