Tsurumi Float Switches

Tsurumi Float Switches are highly durable and accurate level sensors designed to automate water level control in clean water, wastewater, and scum-filled environments. With a diverse lineup—including the MT, MC, MF, and RF Series—Tsurumi offers float switch solutions suitable for a wide range of operational demands and installation conditions.

Key Features

• Rugged and waterproof construction for long-term reliability in harsh water environments

• Mercury-free switches with integrated or external counterweights

• Available contact types: normally open (a) or normally closed (b)

• Wide temperature tolerance: 0 to 50°C

• Shock-resistant and chemical-resistant materials used for float and cable components

• Float position stability ensures precise level switching and reduces false signals

Model Overview & Technical Specifications

MT Series – Integrated Counterweight Float Switch

Designed for automatic control in wastewater systems, the MT model features a teardrop-shaped float with three watertight chambers and a built-in counterweight for accurate switching without external weights.

• Switch type: SPDT (Snap-action)

• Max current: 10 A (resistive), 8 A (inductive) at 250 V AC

• Proof pressure: 196 kPa (2.0 kgf/cm²)

• Cable: H05 RN-F 3×1 mm²

• Float material: Polypropylene

• Weight: 900 g (float only)

• Operating angle: 20°

MC Series – Ball Float with Shock Absorber

This float uses a ball-type mechanism with built-in shock absorbers, suitable for tanks with high turbulence or suspended solids.

• Max current: 2 A at 30 V AC

• Contact type: a (NO) or b (NC)

• Cable: 3 × 0.75 mm²

• Proof pressure: 98 kPa

• Weight: 1,087 g

• Ideal for: scum-laden wastewater, automatic pump activation

MF Series – Miniature Float Switch

Compact and lightweight, the MF Series is perfect for small tanks and minimum-level alerts.

• Contact type: a (NO) / b (NC)

• Max current: 2 A at 30 V AC

• Cable: 2 × 0.3 mm²

• Proof pressure: 98 kPa

• Weight: 98 g

• Use case: level alerts in confined tanks or equipment

RF Series – Snap-Action Level Sensor

A simple yet effective snap-action float switch, designed for clear water, wastewater, or liquid with suspended matter.

• Contact type: a (NO)

• Max current: 2 A at 30 V AC

• Adjustable hanging length: 400 mm – 3,000 mm

• Cable: 2 × 0.5 mm²

• Weight: 207 g

• Ideal for: straightforward level control where cost and ease of use are key

Typical Applications

• Automatic pump control for water supply and drainage systems

• High and low water level alert systems

• Scum and suspended solid monitoring in wastewater tanks

• Compact system integration in industrial machinery

Tsurumi Float Switches combine Japanese engineering with field-proven durability, making them a trusted choice for water level monitoring in municipal, industrial, and environmental systems. Whether you need a compact sensor for tight spaces or a rugged switch for sludge-heavy environments, Tsurumi has a float switch for the job.