Crane Anti Two Block Switch

The Rayco Wylie mechanical anti–two block switch is a simple, rugged safety device that helps protect both the crane and the lift by preventing “two-blocking” (when the hook block contacts the boom tip or sheaves). Because it’s purely mechanical, it can be highly dependable in harsh jobsite conditions—less sensitive to electrical noise, moisture, or wiring issues—and it provides a direct, fast-acting shutdown signal to stop hoist-up before damage occurs. That can reduce costly repairs to wire rope, sheaves, and load blocks, help minimize downtime, and improve overall jobsite safety for operators and nearby crews. Its straightforward design also makes it easier to inspect and troubleshoot during routine maintenance, supporting consistent safety compliance and more confident lifting operations.