Model RSB Heavy Duty Safety Pull Cord Switch

Model RSB Heavy Duty Safety Pull Cord Switch provides positive shut off of dangerous equipment in an emergency. A cable pulled by endangered personnel actuates it. The output contacts can control up to two separate circuits, one for machinery shutdown and one for an alarm. Model RSB has the built-in advantage of cable break detection.

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Description

Model RSB Heavy Duty Safety Pull Cord Switch with built-in broken cable detection acts as an emergency stop pull cord control on conveyors and other moving machinery. Model RSB has extension springs, attached to opposite ends of the pull cable, which maintain the cable under constant tension. The heavy duty safety pull cord is mounted so it is centered between the end
springs. In this way, temperature changes, which cause cable length changes, are canceled out. The operating handle is held in the center vertical position with the internal switch in a normally closed condition. If the cable is pulled or the cable breaks, the handle rotates to release the switch lever. In this way, the alarm signal is generated for either condition. The operating handle must be manually reset back to the center position after the cause has been corrected.

Specifications

Housing is cast aluminum with optional epoxy or polyester powder coatings.
Unit can be actuated via a cable pull from either or both directions on every unit; in other words, the unit is “double ended”. Cable must extend from both sides of the
RSB unit.
Unit is mounted on the conveyor by drilling (3) 13/32” diameter holes.
All units have (3) 3/4” NPT conduit openings.
Standard units have dry, unpowered SP/DT micro switches rated for 20A @ 120 VAC, 240VAC, and 480 VAC; 1/2 amp at 125 VDC and 1/4 amp at 250 VDC.
Special spring tensioning kits included with each RSB unit provide stability due to temperature fluctuations, and ease of cable adjustment.
Functional ambient temperature is -50° to 85° C [-58° to 185° F].
General purpose units are rated NEMA type 4/4X weatherproof and corrosion-resistant. Explosion proof units are rated NEMA type 7/9 for dust ignition proof and vapor explosion proof. Specifically, they are listed for Class I, Div. 1, Groups C and D; and Class II, Div. 1, Groups E, F and G.
Dual-rated “D” units are rated NEMA type 4X weatherproof and NEMA type 9 dust ignition proof. Specifically, they are listed for Class II, Groups E, F and G.
General purpose controls meet or exceed IP65.
UL listed and CSA listed.

Model RSB Heavy Duty Safety Pull Cord Switch