The A2B Limit Switch, also known as the Anti Two Block Switch, is a critical crane safety device designed to prevent the hook block from colliding with the boom tip. When the lifting hook approaches dangerously close to the boom head, the switch automatically cuts off the hoisting motion or triggers an alarm, protecting both the crane structure and lifting components from damage.
It ensures safe operation in tower cranes, mobile cranes, crawler cranes, and Hydra cranes, enhancing the reliability and safety of crane lifting systems.
| Parameter | Specification |
|---|---|
| Type | Anti Two Block (A2B) Limit Switch |
| Function | Prevents hook block–boom head collision |
| Switch Type | Heavy-duty micro switch with actuating weight assembly |
| Contact Configuration | 1 NO + 1 NC (or as per requirement) |
| Operating Voltage | 24V DC / 110V AC / 230V AC (customizable) |
| Current Rating | Up to 10A |
| Housing Material | Aluminum / Stainless Steel (weatherproof enclosure) |
| Ingress Protection | IP65 / IP67 |
| Cable Length | 2 to 10 meters (as per model) |
| Operating Temperature | -20°C to +70°C |
| Mounting | Boom tip or jib head |
| Output Signal | Electrical signal to control panel or LMI |
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