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TSURUMI KTZE21.5 Automatic Submersible Dewatering Pump (50mm, 1.5kW, 3-Phase, Electrode Auto Control)

Brand: TSURUMI
Manufacturer model number: KTZE21.5
Order code: Y8E6AHZ
MOQ: 1 件
Supply status: In Stock
Selected configuration: Standard item

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The TSURUMI KTZE21.5 is a three-phase submersible dewatering pump from Tsurumi's KTZE series (officially classed as a general construction pump, automatic operation type). It has a 50 mm (2-inch) discharge and a 1.5 kW 2-pole motor. A built-in electrode level sensor and relay start the pump when water reaches the probe and stop it after the level falls, so no float switch or control panel is needed. With a grey cast-iron body and a semi-open high-chromium cast-iron impeller, it is built for unattended drainage of stormwater, groundwater, wash water and sand-carrying water on construction sites, in basements and in sumps (liquid 0–40 °C, solids up to 8.5 mm).

Selection note: the KTZE21.5 is the automatic version of the KTZ series. If start/stop is already handled by a float switch or control panel, the non-automatic KTZ21.5 is an option. For more flow at a lower head with the same 1.5 kW motor, choose the 80 mm KTZE31.5. The KTZE21.5 is a dewatering pump, not a slurry pump: it has no agitator and is not suitable for bentonite or settled sludge.

Key features

Electrode automatic operation: the electrode probe and relay are built into the pump. When water touches the probe, current flows between the electrode and the pump body and the pump starts. Once the water drops below the probe, a built-in timer stops the pump about 1 minute later; if water touches the probe again in that time, the pump runs for one more minute. This prevents dry running and chattering caused by a turbulent water surface.
Lower energy use: up to 40% less power consumption than non-automatic pumps, according to Tsurumi's own comparison. Actual savings depend on site conditions.
Simple installation: just connect the power supply. Raise the pump on blocks to set a higher start level, or stage several pumps at different heights, for example in an underground car park.
Top-discharge, side-flow design: the motor stays cooled even when exposed to air, and the slim body fits narrow sumps.
Multi-directional hose coupling: the discharge can be set vertical or inclined to stop the hose kinking.
Double inside mechanical seals: silicon carbide (SiC) faces on both upper and lower seals, running in an oil chamber with Tsurumi's Oil Lifter, which keeps the seals lubricated and cooled down to one third of the normal oil level.
Wear-resistant materials: high-chromium cast-iron semi-open impeller and ductile cast-iron suction cover; the 420 stainless steel shaft is quenched where it meets particles in the liquid.
Motor protection: a built-in circle thermal protector (CTP) cuts the motor circuit directly on overheating or overcurrent; anti-wicking cable entry and cable clip.

Applications

Construction sites: excavation and basement dewatering, temporary site drainage
Basements and underground car parks: unattended automatic sump drainage
Stormwater and groundwater: flood water and seepage removal
Quarries and aggregate yards: pit dewatering (water only, not slurry transfer)
Wash water and sandy water: solids up to 8.5 mm

Performance

The 21.7 m maximum head is the head at near-zero flow, and the 427 L/min (about 25.6 m³/h) maximum capacity is the end point of the performance curve. The two do not occur together: actual flow falls as total head (static head plus hose friction loss) rises. Select the pump from the performance curve using your site's total head. Figures are from the Tsurumi Europe 400 V 50 Hz data sheet. For higher heads, consider the KTZE22.2 (26.0 m) or KTZE23.7 (36.4 m).

Technical specifications

TSURUMI KTZE21.5 technical specifications (50 Hz)
Item	Specification
General
Model	KTZE21.5
Series	KTZE (cast iron, three-phase, electrode automatic submersible dewatering pump)
Discharge bore	50 mm (2 in)
Discharge connection	Multi-directional hose coupling
Automatic control
Control method	Built-in electrode level sensor and relay (no float switch or control panel needed)
Stop delay	About 1 minute after the water falls below the probe
Starting water level	345 mm
Stop level	About 120 mm (Tsurumi UK data)
Hydraulic performance
Max. head (at zero flow)	21.7 m
Max. capacity (curve end point)	427 L/min (about 25.6 m³/h)
Max. solids size	8.5 mm
Electrical
Motor output	1.5 kW
Motor	2-pole dry-type induction motor, continuous-duty rated, insulation class F, IP68
Synchronous speed	3,000 min⁻¹ (50 Hz)
Power supply	3-phase 50 Hz (voltage as per nameplate)
Starting method	Direct-on-line (DOL)
Motor protection	Built-in circle thermal protector (CTP)
Seals and lubrication
Shaft seal	Double inside mechanical seals, SiC faces upper and lower, with Oil Lifter
Dust seal	NBR oil seal
Lubricant	Turbine oil ISO VG32, 740 ml
Materials
Impeller	Semi-open, high-chromium cast iron
Suction cover	Ductile cast iron
Pump casing and motor frame	Grey cast iron
Shaft	420 stainless steel (quenched where it meets particles)
Cable
Cable length	8 m (standard)
Cable type	PVC sheath, 4 × 1.25 mm², 11.1 mm OD
Liquid limits
Liquid	Stormwater, groundwater, wash water and sand-carrying water
Liquid temperature	0–40 °C
Max. submersion depth	25 m
Dimensions and weight
Dry weight (excl. cable)	39 kg
Plan dimensions (catalogue A × D)	270 × 224 mm
Height (catalogue H)	628 mm

Sources: Tsurumi KTZ/KTZE series catalogue (IB107), Tsurumi Pumps Australia KTZE product guide, Tsurumi Europe KTZE21.5 data sheet (400 V 50 Hz) and Tsurumi UK data. Voltage, cable and rated current of the Hong Kong supply version are as per the nameplate and confirmation from the Hong Kong agent.

KTZE series comparison

Tsurumi KTZE series model comparison (50 Hz)
Model	Discharge	Power	Max. head	Max. capacity	Dry weight
KTZE21.5 (this product)	50 mm	1.5 kW	21.7 m	427 L/min	39 kg
KTZE22.2	50 mm	2.2 kW	26.0 m	499 L/min	41 kg
KTZE23.7	50 mm	3.7 kW	36.4 m	449 L/min	69 kg
KTZE31.5	80 mm	1.5 kW	14.4 m	670 L/min	38 kg
KTZE32.2	80 mm	2.2 kW	20.5 m	795 L/min	40 kg
KTZE33.7	80 mm	3.7 kW	28.9 m	898 L/min	69 kg
KTZE43.7	100 mm	3.7 kW	18.0 m	1,432 L/min	69 kg

Optional accessories

Multi-directional male threaded coupling, in place of the standard hose coupling for threaded pipe connections.
Extension probe: made of coil spring and cut to length on site to lower the starting water level (Tsurumi UK states by about another 90 mm).
Electrode probe cover: structural steel, fitted on site to protect the probe from impacts.
Factory options (order separately): seawater-resistant kit (galvanic anode plus special impeller) and high-temperature version (liquid up to 80 °C). The standard model has neither.

Safety and installation

Electrical connection must be made by a registered electrical worker in line with local regulations, with a correct earth and earth-leakage protection. Provide upstream short-circuit and overload protection; the motor's built-in CTP does not replace it.
Per the Tsurumi Europe 400 V 50 Hz data, the KTZE21.5 draws about 3.5 A rated and about 22 A at start-up. Size generators and breakers for the starting current.
Check the direction of rotation before first use. Wrong phase sequence on a three-phase pump reverses rotation and reduces performance; have an electrician swap two phases.
The pump can start at any moment once the probe is wet. Always isolate the power before handling, lifting or servicing.
Electrode control relies on the liquid conducting current between the probe and the pump body. Very low-conductivity liquid may not trigger a start, so test on site.
Lift the pump by its handle only. Never lift it by the power cable, and protect the cable from damage.
Stand the pump on a firm base or blocks so it does not draw in mud and gravel.
The standard model is not seawater-resistant. Do not use it for liquids above 40 °C, chemicals, oil, solvents, sewage containing fibres or flammable liquids, or in flammable or explosive atmospheres.

Wear parts and routine checks

The impeller, suction cover and mechanical seals take the wear from sandy water; flow gradually drops after long running, so check them regularly.
Check the oil level and condition in the oil chamber at regular intervals (turbine oil ISO VG32, 740 ml). If the oil is cloudy or contains water, have the shaft seals inspected promptly.
The CTP resets automatically once the motor cools. Find the cause of any trip, such as a blockage, low voltage or a lost phase, before continuing.

Reviews & Q&A

No reviews yet. Be the first to review this product.

Key features

Electrode automatic operation: the electrode probe and relay are built into the pump. When water touches the probe, current flows between the electrode and the pump body and the pump starts. Once the water drops below the probe, a built-in timer stops the pump about 1 minute later; if water touches the probe again in that time, the pump runs for one more minute. This prevents dry running and chattering caused by a turbulent water surface.
Lower energy use: up to 40% less power consumption than non-automatic pumps, according to Tsurumi's own comparison. Actual savings depend on site conditions.
Simple installation: just connect the power supply. Raise the pump on blocks to set a higher start level, or stage several pumps at different heights, for example in an underground car park.
Top-discharge, side-flow design: the motor stays cooled even when exposed to air, and the slim body fits narrow sumps.
Multi-directional hose coupling: the discharge can be set vertical or inclined to stop the hose kinking.
Double inside mechanical seals: silicon carbide (SiC) faces on both upper and lower seals, running in an oil chamber with Tsurumi's Oil Lifter, which keeps the seals lubricated and cooled down to one third of the normal oil level.
Wear-resistant materials: high-chromium cast-iron semi-open impeller and ductile cast-iron suction cover; the 420 stainless steel shaft is quenched where it meets particles in the liquid.
Motor protection: a built-in circle thermal protector (CTP) cuts the motor circuit directly on overheating or overcurrent; anti-wicking cable entry and cable clip.

Applications

Construction sites: excavation and basement dewatering, temporary site drainage
Basements and underground car parks: unattended automatic sump drainage
Stormwater and groundwater: flood water and seepage removal
Quarries and aggregate yards: pit dewatering (water only, not slurry transfer)
Wash water and sandy water: solids up to 8.5 mm

Performance

Technical specifications

TSURUMI KTZE21.5 technical specifications (50 Hz)
Item	Specification
General
Model	KTZE21.5
Series	KTZE (cast iron, three-phase, electrode automatic submersible dewatering pump)
Discharge bore	50 mm (2 in)
Discharge connection	Multi-directional hose coupling
Automatic control
Control method	Built-in electrode level sensor and relay (no float switch or control panel needed)
Stop delay	About 1 minute after the water falls below the probe
Starting water level	345 mm
Stop level	About 120 mm (Tsurumi UK data)
Hydraulic performance
Max. head (at zero flow)	21.7 m
Max. capacity (curve end point)	427 L/min (about 25.6 m³/h)
Max. solids size	8.5 mm
Electrical
Motor output	1.5 kW
Motor	2-pole dry-type induction motor, continuous-duty rated, insulation class F, IP68
Synchronous speed	3,000 min⁻¹ (50 Hz)
Power supply	3-phase 50 Hz (voltage as per nameplate)
Starting method	Direct-on-line (DOL)
Motor protection	Built-in circle thermal protector (CTP)
Seals and lubrication
Shaft seal	Double inside mechanical seals, SiC faces upper and lower, with Oil Lifter
Dust seal	NBR oil seal
Lubricant	Turbine oil ISO VG32, 740 ml
Materials
Impeller	Semi-open, high-chromium cast iron
Suction cover	Ductile cast iron
Pump casing and motor frame	Grey cast iron
Shaft	420 stainless steel (quenched where it meets particles)
Cable
Cable length	8 m (standard)
Cable type	PVC sheath, 4 × 1.25 mm², 11.1 mm OD
Liquid limits
Liquid	Stormwater, groundwater, wash water and sand-carrying water
Liquid temperature	0–40 °C
Max. submersion depth	25 m
Dimensions and weight
Dry weight (excl. cable)	39 kg
Plan dimensions (catalogue A × D)	270 × 224 mm
Height (catalogue H)	628 mm

KTZE series comparison

Tsurumi KTZE series model comparison (50 Hz)
Model	Discharge	Power	Max. head	Max. capacity	Dry weight
KTZE21.5 (this product)	50 mm	1.5 kW	21.7 m	427 L/min	39 kg
KTZE22.2	50 mm	2.2 kW	26.0 m	499 L/min	41 kg
KTZE23.7	50 mm	3.7 kW	36.4 m	449 L/min	69 kg
KTZE31.5	80 mm	1.5 kW	14.4 m	670 L/min	38 kg
KTZE32.2	80 mm	2.2 kW	20.5 m	795 L/min	40 kg
KTZE33.7	80 mm	3.7 kW	28.9 m	898 L/min	69 kg
KTZE43.7	100 mm	3.7 kW	18.0 m	1,432 L/min	69 kg

Optional accessories

Multi-directional male threaded coupling, in place of the standard hose coupling for threaded pipe connections.
Extension probe: made of coil spring and cut to length on site to lower the starting water level (Tsurumi UK states by about another 90 mm).
Electrode probe cover: structural steel, fitted on site to protect the probe from impacts.
Factory options (order separately): seawater-resistant kit (galvanic anode plus special impeller) and high-temperature version (liquid up to 80 °C). The standard model has neither.

Safety and installation

Electrical connection must be made by a registered electrical worker in line with local regulations, with a correct earth and earth-leakage protection. Provide upstream short-circuit and overload protection; the motor's built-in CTP does not replace it.
Per the Tsurumi Europe 400 V 50 Hz data, the KTZE21.5 draws about 3.5 A rated and about 22 A at start-up. Size generators and breakers for the starting current.
Check the direction of rotation before first use. Wrong phase sequence on a three-phase pump reverses rotation and reduces performance; have an electrician swap two phases.
The pump can start at any moment once the probe is wet. Always isolate the power before handling, lifting or servicing.
Electrode control relies on the liquid conducting current between the probe and the pump body. Very low-conductivity liquid may not trigger a start, so test on site.
Lift the pump by its handle only. Never lift it by the power cable, and protect the cable from damage.
Stand the pump on a firm base or blocks so it does not draw in mud and gravel.
The standard model is not seawater-resistant. Do not use it for liquids above 40 °C, chemicals, oil, solvents, sewage containing fibres or flammable liquids, or in flammable or explosive atmospheres.

Wear parts and routine checks

The impeller, suction cover and mechanical seals take the wear from sandy water; flow gradually drops after long running, so check them regularly.
Check the oil level and condition in the oil chamber at regular intervals (turbine oil ISO VG32, 740 ml). If the oil is cloudy or contains water, have the shaft seals inspected promptly.
The CTP resets automatically once the motor cools. Find the cause of any trip, such as a blockage, low voltage or a lost phase, before continuing.

JACO自營旗艦店

TSURUMI KTZE21.5 Automatic Submersible Dewatering Pump (50mm, 1.5kW, 3-Phase, Electrode Auto Control)

JACO自營旗艦店

Key features

Applications

Performance

Technical specifications

KTZE series comparison

Optional accessories

Safety and installation

Wear parts and routine checks

Reviews & Q&A

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TSURUMI KTZE21.5 Automatic Submersible Dewatering Pump (50mm, 1.5kW, 3-Phase, Electrode Auto Control)

JACO自營旗艦店

Key features

Applications

Performance

Technical specifications

KTZE series comparison

Optional accessories

Safety and installation

Wear parts and routine checks

Reviews & Q&A