Located in Crystal Lake, Ill., Boltswitch Inc. is a manufacturer of a variety of special switches, live-front disconnects, dead-front disconnects, transit switches and fuse blocks. Since its first switch pole filing in 1953, it has been serving the switch building industry. The companys large switches were the first to pass the UL (Underwriters Laboratories) tests at 600 volts. Its products ratings are anywhere between 800 through 6000 amps, with voltage ratings of up to 3kv.