The ABB TEYF3100 is a reliable circuit breaker designed for grounded 480Y/277 Vac systems, offering a compact one-inch width per pole that makes it a solid choice for space-conscious setups. This "bolt-on" breaker comes with a mounting base accessory, allowing it to be easily installed as a lug-lug breaker, which adds to its versatility. Known for its quick-make/quick-break mechanism and clear trip indicators, the TEYF ensures both safety and dependable performance. It’s available in 1, 2, and 3 pole configurations and can be customized with auxiliary contacts or shunt trip accessories to fit specific needs. Distributed by BSP Automation, this breaker is a go-to for professionals looking for robust protection without the hassle. The TEYF3100, often referred to as 783164388596, is the 3-pole 100-amp model that brings solid performance to the table.