NAMCO grew from the heavy-duty side of the industrial world.
For decades, SNAP-LOCK® Limit Switches have been the benchmark in reliability for steel mills, auto factories, foundries, power plants, and machine shops.
NAMCO still provides unparalleled reliability in the toughest environments and heavy-duty applications. They are rugged enough to operate under the most severe conditions and durable enough for a long, trouble-free lifespan.
 Nuclear Qualified Products |
 Heavy-Duty Limit Switches |
NAMCO developed the world’s first switch qualified for safety-related applications in nuclear power plants in 1972. With over 100,000 nuclear-qualified safety switches installed around the globe, no other manufacturer has more experience in one of the world’s most critical applications.
Today, NAMCO continues to strive for innovation. To ensure nuclear plants are less vulnerable in the wake of natural disasters, our non-contact position indication solution addresses the most demanding and evolving requirements in harsh applications. The NAMCO EA120 Series Magnetic Proximity Limit Switch design utilizes our proprietary SNAP-LOCK® technology, which enables us to exceed seismic performance requirements in the smallest footprint.
Our Nuclear Qualified Products
 EA120 SeriesMagnetic Proximity Sensor |
 EA740 SeriesLimit Switch |
 EA180 SeriesLimit Switch |
 EA170 SeriesLimit Switch |
 NuclearConnectors |
Heavy-Duty Limit Switches for Rugged Industrial Applications
With our heritage of designing switches to withstand seismic events in the nuclear industry, Namco heavy-duty mechanical limit switches with SNAP-LOCK® technology provide unparalleled reliability in the toughest environments. Namco offers multiple sizes, housings, lever material types, actuation methods, and NEMA-rated designs for hazardous environments, so you can find the right heavy-duty limit switch that will meet your application’s demands.
Quick Links:
EA040 Neutral Position Limit Switch
Designed for applications where a neutral position is essential in operation. This series provides the same locking action as the other series of SNAP-LOCK Switches.
EA060 Short Travel Limit Switch
With mechanical travel of less than 61⁄2° required to trip, this heavy-duty limit switch operates with one normally open and one normally closed circuit.
EA080 Rocker Type Standard Limit Switch
This series was designed by the Electrical Manufacturing Division of National Acme to fill a need for limit switches offering a high degree of repeatability, life, and reliability for use on machine tools. This series of limit switches remains one of our most popular lines. It has numerous applications in machine controls, conveyors, material-handling systems, and valve controls.
EA150 Gravity Return/Spring Return Limit Switch
EA150 has dust-tight zinc housing with an LED light option. It’s ultra-sensitive and has a gravity or spring return for small-part and other light-touch requirements.
EA700 Cam Operated Limit Switch
Where relatively fast motions are involved, EA700 cam-operated limit switches are designed to ensure the switch actually does not receive a severe impact, thus damaging the switch.
EA780-790 Navy-Marine Position Limit Switch
Completely fabricated from non-corrosive materials, the EA780-790 series bronze housing and high-quality stainless steel shaft completely protect against external damage to the switch from salt spray or other corrosive elements. Sealing against leakage is achieved through the use of high-quality gaskets on machined surfaces and “0” Ring protection, plus close tolerance between the shaft and bushing.
EA800 Neutral Position Limit Switch
This series of hazardous location SNAP-LOCK Limit Switches utilizes the internal mechanism of the EA700 series, with a significant advantage. The mechanisms are enclosed in UL-listed, NEMA-rated housing available in aluminum or bronze and are perfect for use in use in environments with excessive vibration, dirt, and heat.
EA880 Hazardous Location Limit Switch
These hazardous location SNAP-LOCK switches can have any of the internal mechanisms of the EA080, EA060, or EA040 switches. They are enclosed in UL-listed NEMA-rated aluminum housings.
What is a heavy-duty limit switch?
A heavy-duty limit switch is used for position indication and over-travel protection in harsh and abrasive environments. Robust features such as die-cast housing, heavy-duty mechanisms, and industrial-grade contacts allow a heavy-duty limit switch to withstand hazardous applications with a long mechanical life.
When should a heavy-duty limit switch be used?
A heavy-duty limit switch should be used in applications with harsh environmental factors such as extremely high or low temperatures, vibration and shock, and corrosive/hazardous liquids and gases. Hazardous environments typically require heavy-duty limit switches that are NEMA-rated for dust-tight, water-tight, and oil-tight applications.
What are the types of heavy-duty limit switches?
The three main types of heavy-duty limit switches include lever actuated, proximity, and reed types. The lever-actuated switch is popular in heavy-duty applications and can be broken down into cam-type and rocker-type mechanisms.
