TopWorx GO Switch Model 73 Leverless Limit Switch | Industrial Proximity Sensor

TopWorx GO™ Switch Model 73 Limit Switch - Proximity Sensor

The TopWorx™ GO™ Switch Model 73 is the world’s most widely trusted leverless limit switch, engineered for long‑lasting, non‑contact position sensing in the toughest industrial environments. With no external moving parts, no springs, cams, or reed elements to wear out, the Model 73 delivers dependable switching performance even under vibration, moisture, and continuous cycling.

Built with a rugged 316L stainless steel housing and sealed dry contacts, this proximity sensor offers AC/DC wiring flexibility, SPDT output, and reliable end sensing. Its compact design and hazardous‑area options make it ideal for process control, valve position monitoring, and heavy‑duty automation applications where durability and uptime are critical.

GO™ Switch Model 73 Leverless Limit Switch Features

SPDT form C contact arrangement
2A/240VAC, 3A/120VAC, 1A/24VDC
316L stainless steel housing
0.100 end sensing
316L stainless steel housing
-50° to 105°C (-58° to 221°F) operating temperature
1/2 NPT or M20 conduit entry
5/8 - 18 or M18 mounting threads

GO™ Switch Model 73 Leverless Limit Switch Specifications

The TopWorx™ GO™ Switch Model 73 Leverless Limit Switch offers a combination of durability, electrical flexibility, and environmental resistance.

Specifications include:

Contact type: SPDT (Single Pole Double Throw)
Electrical rating: Up to 2A at 240 VAC, 3A at 120 VAC, 1A at 24 VDC
Sensing distance: Approximately 0.100 in (2.5 mm)
Operating temperature: −50°C to +105°C (−58°F to +221°F)
Construction: 316L stainless steel housing
Mounting: 5/8-18 or M18 threaded mount
Conduit entry: 1/2" NPT or M20

These specifications make the Model 73 a reliable replacement for mechanical limit switches and inductive proximity sensors in harsh environments.

GO™ Switch Model 73 Leverless Limit Switch Applications

The TopWorx™ GO™ Switch Model 73 Leverless Limit Switch is widely used in demanding industrial environments that require reliable position sensing.

Common applications include:

Valve position indication
Oil & gas process automation
Chemical and petrochemical plants
Power generation facilities
Mining and heavy industrial equipment
Hazardous or explosive environments

Its durable 316L stainless steel construction, high-pressure ratings, and hazardous area certifications make it especially suitable for critical safety and process monitoring applications.

Q&A Section with Expand/Collapse Icons

GO™ Switch Model 73 Leverless Limit Switch Q & A

+What is the TopWorx™ GO™ Switch Model 73 and how does it work?

The TopWorx™ GO™ Switch Model 73 Leverless Limit Switch is a rugged proximity limit switch used to detect the presence or position of metal targets in industrial automation and process control systems. Unlike traditional mechanical limit switches, it has no external moving parts, springs, cams, or reed elements, which eliminates wear and significantly improves reliability.

The switch uses internal magnetic technology and sealed contacts to change state when a ferrous metal target enters the sensing zone, producing a dry contact output signal for control systems. This design makes it ideal for harsh environments where conventional switches frequently fail.

+What makes the GO™ Switch Model 73 more reliable than traditional limit switches?

The TopWorx GO™ Switch Model 73 Leverless Limit Switch is designed for extreme reliability because it eliminates the common failure points found in mechanical switches.

Key advantages include:

No external moving parts to wear or break
No springs, cams, or reed elements
Sealed dry contact design that resists contamination
Solid stainless-steel housing for corrosion resistance
No power required to operate

Because of these features, the switch can operate in environments with vibration, moisture, high pressure, or extreme temperatures where traditional limit switches or proximity sensors may fail.

+Can the GO™ Switch Model 73 be used in hazardous or extreme environments?

Yes, the TopWorx GO™ Switch Model 73 leverless limit switch is specifically designed to operate in hazardous and demanding industrial environments. Many configurations are available with hazardous location certifications such as ATEX and IECEx, allowing the switch to be used in explosive atmospheres found in oil and gas production, chemical processing facilities, and offshore platforms. The switch is also capable of operating in high-temperature environments up to approximately 204°C or 400°F and can withstand pressure ratings that may reach up to 10,000 PSI, depending on the configuration. Optional features such as hermetically sealed designs and subsea connectors further expand its suitability for extreme industrial and offshore applications where reliability and safety are critical.

+What are the extreme-duty options for Model 73?