The 1620-3-30A is a single-pole, Type 3 thermal miniature circuit breaker designed for automotive use, fitting into fuse blocks that conform to ISO 8820-3, Type F. This model features a manual reset button and is rated for a 30A current, operating on both DC 12V and DC 24V systems with a maximum voltage of 29.0V DC. It is engineered to function reliably in a wide ambient temperature range of -40°C to +85°C. Common applications include the protection of electrical systems in passenger cars, trucks, buses, and watercraft, being particularly suitable for installation in inaccessible locations.