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Stainless steel float on stem, threaded tank fitting, compact switch housing

SQUARE D

SQUARE D Liquid Level Switch 2-1/2 in MNPT Close On Rise

SKU CH-17B4-ECDSX

A liquid-level switch with a 2-1/2 in MNPT connection that closes on rise, rated to 50 psi and 475 V

  • TypeLight Switch
  • Closes on rising liquid level to activate pumps
  • Side-mounted with 16.06 in overall length for tank fit
  • Stainless steel float and stem resist corrosion up to 250 Degrees F
  • DPST-2NC contacts handle 475 V and 2 hp at 120 V
  • NEMA 1 rated enclosure withstands 50 psi operating pressure

Liquid-level switch for 2-1/2 in MNPT tanks

This Square D liquid-level switch mounts through a 2-1/2 in MNPT tank connection and uses a stainless-steel float on a 4.37 in stem to detect rising liquid. It is built for industrial tanks that need automatic pump or alarm control when the level reaches a set point. The DPST-2NC contact form opens two circuits on rise, giving a positive shut-off signal for motors or alert systems.

Electrical and pressure limits of the switch

The switch carries up to 475 V and is rated for 2 hp at 120 V or 3 hp at 240 V single-phase, so the motor load must stay within those horsepower figures. Maximum tank pressure is 50 psi and the operating temperature must not exceed 250 degrees F. NEMA 1 rating means the enclosure is intended for indoor use where falling dirt is the only environmental concern.

Side-mount installation with a large float

The 2.58 in diameter float needs 7.13 in of clear travel inside the tank, so the mounting port must provide that unobstructed space. A 2-1/2 in MNPT fitting is required; smaller or differently threaded ports will not seal correctly. The most common issue is insufficient float clearance caused by internal tank ribs or baffles that block the 4 1/2 in float travel.

Highlights

  • Closes on rising liquid level to activate pumps
  • Side-mounted with 16.06 in overall length for tank fit
  • Stainless steel float and stem resist corrosion up to 250 Degrees F
  • DPST-2NC contacts handle 475 V and 2 hp at 120 V
  • NEMA 1 rated enclosure withstands 50 psi operating pressure

Specifications

BrandSquare D
TypeLight Switch

Questions about this item

Which switch function and tank connection size should I select for a 2-1/2 in MNPT side-mount tank?

This model is built with a Close On Rise function and a 2-1/2 in MNPT tank connection, so it matches that exact requirement without needing a different version.

What does the 2 hp at 120 V and 3 hp at 240 V rating mean for motor control in daily use?

The contacts are rated to switch single-phase motors up to 2 hp on 120 V circuits and up to 3 hp on 240 V circuits, covering typical pump or fan loads within those limits.

What does the DPST-2NC contact form and 475 V max voltage cap in a real installation?

DPST-2NC provides two normally-closed poles that open on liquid rise, and the 475 V maximum voltage rating sets the highest circuit voltage the switch can safely interrupt.

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