CTMB8003

The nVent CTMB8003 CT Mounting Base is a high-performance, galvanized steel solution engineered for 3-phase, 4-wire (3Ø4W) current transformer cabinets, delivering reliable conductor connection and electrical isolation in demanding industrial environments. Designed to accommodate 400-800 amp applications, this mounting base ensures compatibility with ANSI C12.11-compliant bar-type current transformers, providing a secure platform for accurate metering and protection systems. The CTMB8003 features three 1/2-inch studs spaced at 1-3/4 inches on center, each equipped with nuts, springs, and flat washers for robust mechanical connections. This configuration simplifies installation while ensuring consistent electrical contact and long-term reliability, even in high-vibration or high-temperature conditions typical of utility substations, commercial buildings, and industrial facilities. One of the key advantages of the nVent CTMB8003 is its electrically isolated mounting and termination platform, constructed from 12-gauge galvanized steel to resist corrosion and maintain structural integrity over time. The galvanized finish (mounting plate only) provides enhanced durability without the need for additional coatings, reducing maintenance costs and downtime. Additionally, the base includes a neutral bar with a 10-32 tap screw, enabling flexible grounding and bonding options to meet NEC and local electrical code requirements. Pre-punched mounting holes align precisely with standard CT cabinet studs, streamlining installation and minimizing alignment errors that can compromise system performance. The CTMB8003 supports a wide range of conductor sizes, accommodating up to three 750MCM or six 250MCM conductors per phase, making it suitable for both high-current and multi-conductor applications. With an A.I.C. rating of 50,000 amps and a maximum voltage rating of 600 VAC, this mounting base is built to handle the most demanding electrical environments, including utility metering, power distribution, and renewable energy systems. Its UL 414 listing (File E240312) further underscores compliance with rigorous safety and performance standards, providing peace of mind for engineers, electricians, and facility managers. Industries that benefit from the nVent CTMB8003 include utilities, commercial real estate, manufacturing, healthcare, and data centers, where accurate current measurement and reliable electrical connections are critical. Whether used in new construction or retrofit projects, this mounting base simplifies system design by offering a standardized, high-quality solution that reduces engineering time and installation complexity. nVent’s reputation for innovation and reliability in electrical infrastructure solutions ensures that the CTMB8003 meets the highest standards of performance and durability, making it a trusted choice for professionals who demand precision and longevity in their electrical systems. For applications requiring alternative connection styles, nVent offers the CTMB8003L (lugs only) and CTMB4001LS (lugs and studs) variants, providing flexibility to match specific conductor preferences and cabinet configurations. The CTMB8003 is part of nVent’s comprehensive line of current transformer mounting solutions, designed to integrate seamlessly with Hoffman CT cabinets and other industry-standard enclosures. By choosing the nVent CTMB8003, professionals gain a robust, code-compliant, and future-proof component that enhances the safety, efficiency, and reliability of their electrical infrastructure.