Description
Product Description
Double Top and Lower Limit Switches
This double top and lower limit switch is a safety control component specially designed for tower crane hoisting mechanisms. It integrates two independent upper limit switches and two lower limit switches in one unit, providing dual-channel safety protection for the lifting and
lowering travel of the crane hook. When the hook reaches the preset upper or lower extreme positions, the switch will immediately cut off the corresponding power supply, effectively preventing over-lifting (over-hoisting) and over-lowering accidents, ensuring the safe operation of
the tower crane. The product adopts a heavy-duty mechanical structure with reliable contact action, suitable for harsh construction site environments.
Key Features
Dual-channel redundant design: Equipped with double upper and double lower limit switches, enhancing safety and reliability.
High sensitivity & quick response: Fast contact switching, timely power cut-off to avoid mechanical impact.
Heavy-duty construction: Robust metal housing, high mechanical durability, long service life.
Excellent environmental resistance: High protection grade (e.g., IP65/IP67), dustproof, waterproof, suitable for outdoor construction.
Applications
Primarily used for hoisting mechanism travel limit protection in tower cranes (flat-top, luffing jib, hammerhead cranes).
Also applicable to construction hoists, gantry cranes, bridge cranes, and other lifting machinery requiring upper/lower travel safety control.
Serves as a core safety device to prevent over-hoisting, over-lowering, and mechanical collision accidents on construction sites.
Our Advantages
Professional supplier of tower crane spare parts
Competitive pricing
Stable supply and fast delivery
Strict quality inspection before shipment
Export experience to global markets
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