HLLA-1 by Danaher

The HLLA-1 is a mechanically actuated control switch produced by Danaher for the Timers and Controllers series. It uses a cam-driven mechanism to translate machine movement into an electrical signal, which lets automation equipment acknowledge position limits, index points, or process timing events. A single pole inside the housing opens or closes according to cam rotation, providing a compact method for integrating positional feedback into conveyors, presses, or assembly fixtures.

The contacts can continuously carry 25 A on alternating-current circuits, and the insulation withstands up to 600 V AC without flashover. Direct-current loads are supported at 10 A with a maximum voltage of 250 V DC; these ratings accommodate many solenoids, relays, and indicator lamps used in control cabinets. A factory-fitted normally closed contact uses a double-break architecture, so the contact separates in two places to improve arc extinction and extend the service life of the silver contact faces. The design is single-acting, meaning motion in only one direction trips the mechanism. Oil-impregnated bearings stabilize the camshaft, while the spring system is tuned for a left-hand lever orientation to support standardized panel layouts.

The mechanical interface uses a roller lever actuator with a steel roller that follows the machine cam. The lever sweeps through 50° of travel to reach the over-center point. The housing has two conduit entry holes that provide flexible routing for armored or flexible cable, while the molded body helps keep moisture away from the silver contacts. The cam is molded from Bakelite, providing dimensional stability and electrical insulation in humid or high-temperature environments. An internal linkage couples the cam to the contacts, and the compact switch body can be mounted beside aluminum, steel, or composite framing members.