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R140 Anti Two Block


wired Anti-Two-Block Warning System

R140 Anti Two Block Crane Blocking Equipment

The R140 provides an audio and visual alarm when the hook reaches the maximum safe height to the boom tip.

The display is wired to the tip-mounted ATB switch with a cable on a lattice boom or a cable reeling drum on a telescopic boom.


A second switch, weight, and jib cable, if necessary, can be added to monitor both the main and auxiliary hoist on

the same display.


The display has an internal relay that can be integrated with a function lock-out system. (sold separately)

The Rayco/Wylie hardwired ATB switch has a superior design that allows it to rotate 360 degrees and is compatible with

all major brands. Our crane blocking equipment is available in the standard aluminum body design and the marine duty stainless steel version.


  • Fail-safe. If a cable gets cut it will default to alarm mode.

  • Superior ATB switch design.

  • Compatible with major brand systems

  • Output for Lockouts

  • Years of proven reliability

  • IP66 for use in an open cab

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