The TopWorx™ GO™ Switch Model 21 is a compact, leverless proximity limit switch designed for reliable position sensing in harsh and hazardous environments. With rugged construction, snap-action dry contacts, and non-contact sensing technology, it delivers dependable switching performance without the mechanical wear associated with traditional limit switches.
Offering the same features as the GO Switch Model 11, the Model 21 GO™ Switch provides a smaller design. All GO™ Switch wiring options include A/C, D/C, N/O, or N/C, consume no power to operate, and have no current leakage or voltage drop.
Features
GO™ Switch Model 21 Limit Switch - Proximity Sensor Features
- Durable welded stainless-steel construction withstands moisture, salt, corrosives, and abuse
- Heavy-duty contacts
- Seesaw armature provides snap action and high contact pressure
- No lever arms, cams, or springs to break or fail
- Immune to RFI
- Consumes no power to operate
- No current leakage
- Currently, the only explosion-proof proximity switch rated to 10 amps in the world
Specifications
GO™ Switch Model 21 Limit Switch - Proximity Sensor Specifications
Electrical Specifications
- Contact type: SPDT (Form C) dry contact
- Electrical ratings:
- 120 VAC – 10 A
- 240 VAC – 5 A
- 480 VAC – 2.5 A
- 24 VDC – 3 A
- 48 VDC – 1 A
- 120 VDC – 0.5 A
Sensing Specifications
- Sensing type: Side sensing proximity detection
- Target: Ferrous metal or magnetic target
- Standard sensing distance: 9.5 mm (0.375 in)
Mechanical Specifications
- Housing style: Square body limit switch
- Dimensions: approximately 1.5 in square × 3-13/16 in length
- Conduit connection: ½-14 NPT terminal block or lead wires
- Wiring options:
- Terminal block
- Lead wires
- Cable assemblies
- Quick disconnect connectors
Construction Materials
- Standard enclosure: Brass with protective coating
- Optional enclosure: 316L stainless steel for corrosive environments
Environmental Specifications
- Operating temperature: -40°C to 105°C (-40°F to 221°F)
- Environmental ratings: NEMA 4X / 6 / 6P, IP66 / IP67 / IP68 (configuration dependent)
Hazardous Area Approvals
Depending on configuration:
- CSA / FM Class I, Division 1 & 2
- Class II & III hazardous locations
Applications
GO™ Switch Model 21 Limit Switch - Proximity Sensor Applications
Applications include:
- Valve position sensing
- Pump position monitoring
- Conveyor limit detection
- Oil & gas automation systems
- Chemical processing plants
- Power generation equipment
- Offshore and subsea installations
Q & A
GO™ Switch Model 21 Limit Switch - Proximity Sensor Q & A
Yes. The Model 21 is designed for hazardous industrial environments and is available with approvals for Zone 0, Zone 1, Zone 2, and Class I Division 1 and Division 2 locations, depending on configuration. These certifications make it suitable for industries such as oil & gas, petrochemical processing, power generation, and chemical manufacturing.
The GO™ Switch Model 21 offers several advantages over traditional mechanical limit switches:
- Non-contact sensing reduces wear and maintenance
- Sealed contacts protect against moisture, dust, and corrosives
- No external moving parts, such as springs or cams, that can fail
- Immune to electrical noise and RFI
- Consumes no power and produces no voltage drop or leakage
These features provide long service life and high reliability in demanding industrial environments.
The GO™ Switch Model 21 can be configured with several options to fit specific applications, including:
- 316L stainless steel or brass housing
- Terminal block, lead wire, or cable connections
- Quick disconnect connectors (Micro or Mini)
- Latching contact configurations
- Subsea connectors for offshore installations
- Global hazardous area certifications
These options allow engineers to tailor the switch for different mounting requirements, electrical connections, and environmental conditions.
Downloads
TopWorx™ GO™ Switch Sensing Solution Brochure
Call us today at (855) 737-4714 to learn more, or fill out our online form, and someone will get back to you.