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Brass stem liquid level switch with Buna-N float, vertical mount, 32.94 in overall length

Madison

Madison M4168-2 SPST liquid level switch 240VAC

SKU CH-D3AK-D5FDW

SPST liquid level switch opens on rise with 32.94 in brass stem, Buna-N float, 240 VAC rating and 150 psi pressure limit

  • TypeLight Switch
  • SPST contact form simplifies single-circuit liquid level control
  • 240 VAC rating supports standard industrial voltage supplies
  • Brass stem and Buna-N float resist corrosion in harsh fluids
  • 150 psi pressure rating handles demanding tank environments
  • 94 inch overall length fits deep vertical tank installations

Madison M4168-2 SPST liquid level switch 240VAC

This Madison M4168-2 is a single-pole single-throw liquid level switch designed for vertical mounting in open tanks. It suits industrial and commercial systems that require automatic pump or valve control based on fluid height. The brass stem and Buna-N float handle water, oils and compatible chemicals. Buyers needing a switch for sealed vessels or horizontal installation should select a different model.

Thermals noise and power draw

The switch operates without a motor or fan, so it adds no audible noise or measurable heat to the installation. Its contacts are rated for a maximum of 240 VAC and 0.28 A with a 30 VA load limit, keeping power dissipation negligible in normal use. The brass body and Buna-N float withstand process temperatures up to 221 degrees Fahrenheit and tank pressures up to 150 psi.

Bundled accessories and software

The unit ships as a complete assembly with a 32-inch brass stem, a 1.25-inch Buna-N float and a 3/4-inch NPT tank fitting. No separate wiring harness, configuration software or mounting brackets are included. The 3/4-inch conduit entry accepts standard fittings for direct cable connection. CE marking confirms compliance with applicable European directives.

Highlights

  • SPST contact form simplifies single-circuit liquid level control
  • 240 VAC rating supports standard industrial voltage supplies
  • Brass stem and Buna-N float resist corrosion in harsh fluids
  • 150 psi pressure rating handles demanding tank environments
  • 94 inch overall length fits deep vertical tank installations

Specifications

BrandMadison
TypeLight Switch

Questions about this item

How is the 3/4 in NPT tank connection installed, and what step is often missed?

Thread the brass stem into a 3/4 in NPT tank port using pipe sealant on the threads; the step often missed is tightening to the specified 150 psi pressure rating without cross-threading the brass fitting.

What maintenance will the Buna-N float and SPST contacts need over time?

Inspect the Buna-N float for swelling or cracking and verify the SPST contacts still open cleanly at the 0.28 A, 240 V rating; replace the float if the 1.25 in length shows deformation.

At what temperature limit does the switch reach its maximum operating rating first?

The 221 °F maximum operating temperature is the first limit reached under sustained use, beyond which the Buna-N float and 30 VA contact rating cannot be guaranteed.

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