This Lochinvar fuse is a Class G electrical safety device designed to protect electrical circuits from overcurrent conditions. It has a current rating of 30 Amperes (A) and a voltage rating of 480 Volts (V), making it suitable for high-power applications. The Class G designation indicates that the fuse has an interrupting rating of 100,000 Amperes, which is the maximum amount of fault current the fuse can safely interrupt without causing damage or posing a safety risk. This Lochinvar fuse is designed to quickly interrupt the flow of electricity when an overload or short circuit occurs, thereby protecting the rest of the circuit from damage.