Crane Limit Switches

Powered Limit Switches

These Crane Power Limit Switches are mounted on the crane trolley to prevent overtravel of the crane hook when hoisting. They act as a power circuit disconnect for the hoisting motor. On DC applications, a resistor is required with the limit switch to provide dynamic braking.

Features

• Single and duplex types
• 50 hp to 500 hp range, ac or dc operation
• Double-pole, double-throw power circuit contacts
• NEMA 3 enclosed

Heavy-Duty Limit Switches

These Heavy-Duty Control Limit Switches are designed for use with cranes, hoists, conveyors and similar types of moving machinery.

They are supplied with three non-overlapping contacts and with spring return or maintained lever operation. The spring return capability and circuit arrangement can be converted in the field. Standard spring return switches operate in one direction only (contacts change state when lever is moved in one direction from centre).

The spring return type is optionally available with lever operation in either direction (contacts change state when lever is moved in either direction).