XCMG Truck Crane A2B Height Limit Switch - Wired Safety Device
This A2B height limit switch is a wired boom-head safety device reference for XCMG truck cranes. It is used with an actuating weight or cable arrangement to detect a potential two-block condition and signal the crane warning or control circuit.
Identification Points
XCMG crane model and complete serial number
Switch housing, lever or plunger arrangement
Cable length, connector type, pin count and wire colours
Mounting-hole spacing and bracket orientation
Hanging weight, chain or actuating cable details
Readable labels and the original wiring connection
Difference from a Wireless Switch
This page concerns a wired switch reference rather than the wireless transmitter-and-receiver system shown on another product page. The electrical connector, cable route and switch contact arrangement therefore become central fitment checks. A similar housing does not guarantee the same circuit logic.
Inspection and Safety Testing
Inspect the switch body, cable jacket, connector, bracket and actuating mechanism for impact, corrosion or restricted movement. Check the wiring harness and terminal condition before deciding that the switch alone is defective. After installation, the alarm and control response must be tested according to the crane manufacturer’s procedure. The A2B circuit must not be bypassed for continued operation.
Fitment Policy
QY25K, QY50K and QY70K are reference applications from the existing listing, but production differences are possible. The machine serial number, removed switch and wiring should be verified. We do not publish unconfirmed contact logic, voltage rating or environmental protection grade.
Packing
The switch is cushioned against impact, the cable is coiled without sharp bends and the connector is protected from moisture and pin damage. Small brackets and actuating accessories are bagged and labelled separately.
Frequently Asked Questions
Is this the same as a wireless height limit switch?
No. This listing is for a wired A2B switch reference, so cable, connector and circuit details are required.
Can the connector be changed to make another switch fit?
Changing connectors without confirmed circuit information can create a safety risk and is not a reliable fitment method.
What must be tested after installation?
Switch actuation, warning indication and the crane’s specified control response must be tested under the approved service procedure.
