Anti-two-block (ATB or A2B) warning systems are used to warn or prevent the crane operator from two-blocking the crane.
Two-blocking is a dangerous condition where the hook block is raised until it contacts the boom tip.
Two-blocking is dangerous to personnel and can cause expensive damage to crane booms and equipment.
Anti-Two-Block warning systems are the most basic operator aide every crane should have. We offer ATB systems to fit every type of crane and application.
Anti-Two Block Systems