Square D BLO34120 Bolt-Loc Pressure Contact Switch

The Square D BLO34120 Bolt-Loc Pressure Contact Switch is a high-current fusible disconnect designed for industrial power distribution, delivering 1,200 A at 480 V in a front-operated, three-pole, three-wire configuration at 60 Hz. This bolted-pressure contact switch accepts external Class L fuses and arrives in a NEMA 1, open-type, single-mount enclosure with terminal lugs not included. Rated for a 200 kA short-circuit current at 600 V, it provides substantial fault-current capability when paired with appropriate protection. The Bolt-Loc mechanism ensures quick, positive make-break action under load, optimizing reliability in demanding environments. As a member of Square D's Bolt-Loc family, BLO34120 is suited for service entrances, main-disconnect duties, and other high-capacity distribution points where fuse protection is preferred and a rugged, code-compliant disconnect is required.