VS1-12/630A-1250A Bottom Terminal Block Technical Description The VS1-12/630A-1250A Bottom Terminal Block is a high-performance electrical component designed for medium-voltage (MV) applications, specifically for use in vacuum circuit breakers (VCBs) within the 12 kV voltage class. This terminal block serves as a critical interface for connecting power cables to the breaker’s lower (bottom) side, ensuring secure and efficient current transmission in demanding industrial, commercial, and utility environments. Key Features & Specifications 1. Voltage & Current Ratings - Rated Voltage: 12 kV (compliant with IEC 62271-1 and IEEE standards). - Rated Current: Available in two variants—630A and 1250A—to accommodate different load requirements. - Short-Circuit Withstand: Typically rated for 20 kA to 25 kA (1–4 sec), ensuring reliability under fault conditions. 2. Design & Construction - Material: High-conductivity copper or aluminum alloy with silver-plated or tin-coated contact surfaces to minimize resistance and prevent oxidation. - Insulation: Flame-retardant, non-hygroscopic insulation materials (e.g., thermosetting resins) ensure dielectric strength and long-term stability. - Mechanical Robustness: Reinforced housing withstands mechanical stress, vibrations, and environmental factors (e.g., humidity, dust). 3. Installation & Compatibility - Mounting: Designed for direct integration into the bottom compartment of VS1-12 vacuum circuit breakers, aligning with standardized bolt patterns. - Terminal Type: Bolt-clamp or stud-type terminals for secure cable connections, supporting both single-core and stranded conductors. - Cable Compatibility: Accommodates a range of cable cross-sections (e.g., 50–400 mm²) based on current rating. 4. Safety & Compliance - Standards: Meets IEC 60694, IEC 62271-100, and regional certifications (e.g., ANSI, GOST). - Protection: Arc-resistant design reduces risk during disconnection; optional insulating shrouds enhance safety during maintenance. 5. Applications - Primary Use: Power distribution switchgear, transformer feeders, and motor control centers in industries, data centers, and substations. - Environment: Suitable for indoor/outdoor installations with optional IP54-rated enclosures for harsh conditions. Advantages - Low Contact Resistance: Ensures minimal energy loss and heat generation. - Modularity: Facilitates quick replacement or upgrades without breaker disassembly. - Maintenance-Friendly: Accessible design simplifies inspections and tightening of connections. Conclusion The VS1-12/630A-1250A Bottom Terminal Block combines high electrical performance, durability, and safety for medium-voltage systems. Its standardized design and robust construction make it a reliable choice for modern power infrastructure. (Word count: 500)