The A4BQ Time delay Class 'L' bolted tag fuses provide superior protection for service entrance equipment. They offer maximum protection against short circuit let-thru current for downstream circuit components. With a built-in 4-second time-delay characteristic at 500% of rated current, these fuses ensure reliable performance. The rejection-style design prevents replacement errors. These fuses have a voltage rating of 600VAC/500VDC and a rated current of 650A. They are suitable for various applications such as mains, feeders, large motors, lighting, heating & general loads, UPS DC links, battery disconnects, and other DC applications.