Bolt-in Range Fuseholders. From Lawson Fuses, this range of Bolt-in British Standard fuseholders are designed to accommodate bolted tag fuse-links to BS88: Part 2. The bolt-in fuseholders are compatible with a DIN rail mounting adaptor (sold separately) for versatile mounting options. Features and Benefits: Silver plated double base and carrier contacts provide low temperature performance Cable terminal pressure clamp for positive connection ASTA Certified