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Crane Limit Switches

Often, static, tower, gantry, and overhead cranes are used for heavy, repetitive lifting in outdoor or dirty environments where conditions are harsh for operators and equipment. Limit switches play many roles in the operation of cranes, including being a critical safety measure.

How Limit Switches Are Used in Cranes and Hoists

Heavy-duty limit switches can indicate when issues arise, such as a rope coming lose from the groove or when two trolleys are operating on the same bridge. A limit switch can also prevent an overhead crane from lifting loads that are heavier than the rated capacity.

There are types of limit switches that help prevent the hoist from overtravel and some that help protect the crane motor from overheating. It is common to have more than one limit switch on single crane operation. While one switch can indicate that the crane is close to reaching the safe travel limit, another switch can indicate when the safe travel limit is reached and stops the crane from further movement. Heavy-duty limit switches are essential components to providing a safe environment in crane applications.

Heavy Duty Limit Switches

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Crane Limit Switch Applications

Limit Switches for Crane & Hoist Applications

We offer a full portfolio of heavy-duty limit switches to meet the needs of crane control indication applications. NAMCO limit switches offer SNAP-LOCK® technology, a unique feature that helps eliminate dead-band with quick make and quick break action. The contacts are forced to be in one position or the other and cannot dwell in-between open or closed. Each switch has a locking mechanism that mechanically forces the contacts to stay closed until released by the trip lever. NAMCO limit switches are also designed with heavy-duty contacts for electrical durability and chatter due to vibration or seismic events.

Heavy Duty Limit Switches

EA040 Series Heavy Duty Limit Switch

EA040 Neutral Position Heavy Duty Limit Switch
  • Single pole, double throw limit switch
  • Die cast zinc housing for corrosion resistance
  • Watertight, oil & dust tight enclosure
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EA080 Series Heavy Duty Limit Switch

EA080 Rocker Type Heavy Duty Limit Switch
  • Design for mechanical travel less than 10° to trip
  • Heavy operating torque for severe industrial use
  • Die cast zinc housing for corrosion resistance
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EA150 Series Limit Switch

EA150 Gravity/Spring Return Heavy Duty Limit Switch
  • Ideal for sensing small, lightweight objects
  • Applications include Safety interlocks
  • Dust tight zinc housing with LED light option
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Marine Grade Limit Switches

EA780 & EA790 Series Navy Marine Limit Switch

EA780/EA790 Marine Grade Heavy Duty Limit Switch
  • Fabricated from non-corrosive materials
  • Bronze housing, stainless steel shaft
  • Sealed against leakage, NEMA rated housing
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EA800 Series Heavy Duty Limit Switch

EA800 Marine Grade Neutral Position Limit Switch
  • UL listed, NEMA rated housing
  • Available in aluminum or bronze
  • Ideal for applications with excessive vibration
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