Sierra BS11030 Battery Switch w/ AFD - 1/2/BOTH/OFFSierra's BS11030 Battery Switch is a 4-function switch with Alternator Field Disconnect (AFD) that can support 2 battery inputs. This switch has an 1-2-BOTH-OFF function. The BS11020 features a unique ergonomic knob that's designed to be removable for an added level of safety and isolation. Additionally, this switch has a robust glass fiber reinforced nylon enclosure for added durability. Surface or panel mount options provide flexibility during installation and removable windows on all four sides allow for unobstructed wiring.Features: Battery Switch with Alternator Field Disconnect; Unique ergonomic and aesthetic knob design; Robust Glass Fiber reinforced Nylon enclosure; Surface or panel mount options provide flexibility during installation; Includes (4) M4x35 Mounting Screws; Meets Ignition Protection Standard (ISO8846/ SAE J1171); Interchangeable knob labels for easy identification; CE certified; IP66 Rated; Specifications: Function: 1-2-BOTH-OFF; Maximum Voltage Rating: 48VDC; Stud Size: M8; Cranking Rating: (10 Seconds): 1000A; Intermittent Rating: (5 Minutes): 300A; Continuous Rating: 200A; Battery Input: 2; Switch Function: 4; Battery Studs: Tin-Plated Copper; Stud Torque: 120 lb.-in; Cable Size: 4/0 AWG to Meet Ratings;