Grundfos SL1.80.100.40.EX.4.51D.C.Z 98720820 4kW 415v Submersible Waste Pump Dn100 #4520

Grundfos SL1.80.100.40.EX.4.51D.C.Z (98720820) – 4kW 415V Submersible Wastewater Pump (DN100) #4520

This listing is for a Grundfos SL1 sewage / wastewater pump with an S tube® impeller, a DN100 flanged outlet, and an EX (explosion-proof) motor variant. The SL1/SLV family is used across municipal, commercial and industrial wastewater duties where solids handling and serviceability are important.

• Impeller type: SL1 with S tube® hydraulic
• Discharge connection: DN100 flanged outlet (standard flange interface for compatible fittings and pipework)
• Protection & monitoring: thermal switches in the motor windings and moisture monitoring in the motor chamber
• EX variant: explosion-proof motor version (hazardous-area suitability depends on the complete installation and control equipment)

Need help confirming suitability?
Call us on 01803 220416 for technical advice.

Manufacturer product page

Full technical details can be found on the official Grundfos product page:
View Grundfos SL1.80.100.40.EX.4.51D.C.Z (98720820) – Variant specifications

Key specifications (summary)

• Model: SL1.80.100.40.EX.4.51D.C.Z
• Grundfos product number: 98720820
• Rated motor output (P2): 4.0 kW
• Electrical supply / starting: 3 × 380–415 V, 50 Hz, star-delta (D/Y)
• Motor: 4-pole
• Outlet: DN100
• Free spherical passage (maximum particle size): 80 mm
• Maximum installation depth: 17 m
• Variant: EX (explosion-proof)
• Generation: C (4th generation)
• Custom build: Z

Operating limits (summary)

• Operating mode: intended for intermittent duty (S3); continuous duty (S1) is possible when completely submerged
• Intermittent duty guidance: up to 20 starts/hour; run max 4 minutes; stop min 6 minutes (submerged to the bottom of the cable plug)
• Liquid temperature: 0–40 °C (short-duration higher temperatures may be specified for non-EX versions only)
• pH range: 6.5–14 for standard materials; for fluctuating pH values, 4–14 is stated as acceptable guidance
• EX operating condition (manufacturer note): explosion-proof pumps must be fully submerged during operation

Applications & selection guidance (SL1 vs SLV)

Grundfos provides a selection table intended as guidance when choosing between SL1 (S tube®) and SLV (vortex). Selection should be based on the pumped liquid characteristics, solids/fibre loading and operating pattern.

• Dry solids content: up to 3% – SL1 or SLV may be suitable; above this (up to 5%) – guidance points to SLV
• Fibre/solids content: relatively low – SL1 or SLV; relatively high – SLV is typically preferred
• Long fibres (e.g. laundries): both SL1 and SLV are shown as suitable in the guidance table

Typical duties shown as suitable for SL1 include:

• Stormwater, groundwater, drainage and surface water
• Drainage and surface water with small impurities
• Abrasive surface water
• Domestic wastewater including discharge from toilets
• Municipal sewage
• Sewage from commercial buildings
• Industrial process water (with or without solids/fibres depending on duty)

Construction & protection features

• Double mechanical cartridge shaft seal arrangement
• Thermal protection: thermal switches in the stator windings
• Leakage monitoring: moisture monitoring in the motor chamber
• Corrosion protection: protective coating system on cast iron components
• Accessories: supplied separately and not factory-fitted

Delivery & Shipping

• UK and international delivery available
• Next working day dispatch is often possible
• If delivery is time-critical, please call to confirm availability

Frequently Asked Questions

What does the model number mean?

• SL – sewage / wastewater pump range
• 1 – S tube® impeller (SL1)
• 80 – 80 mm free spherical passage
• 100 – DN100 outlet
• 40 – 4.0 kW motor output
• EX – explosion-proof version
• 4 – 4-pole motor
• 5 – 50 Hz
• 1D – 3 × 380–415 V, star-delta (D/Y) starting
• C – 4th generation
• Z – custom-built pump

What discharge connection does this pump have?

This pump is supplied with a standard DIN DN100 flange. Because it follows the DIN standard, compatible fittings, guide claws or accessories from Grundfos or other manufacturers can be connected to the outlet. This often allows connection into existing systems originally using pumps from brands such as Flygt, Lowara, Sulzer, Wilo, KSB and other manufacturers, subject to site configuration.

Can model numbers be interchanged?

Occasionally it is possible to swap different model or part codes for alternative versions within the SL range, depending on the duty point, installation type and electrical configuration. Please call us for a recommendation before ordering if you are looking to replace a different code.

Why choose S tube® (SL1) instead of a vortex pump?

The SL1 S tube® hydraulic is typically selected where you want a balance of energy efficiency and solids handling.

What is the maximum particle size this pump can pass?

The pump has an 80 mm free spherical passage.

What is the maximum installation depth?

Maximum installation depth is 17 m.

Does it include motor protection and leakage monitoring?

Yes – thermal switches and moisture monitoring are included.

Do accessories come fitted?

No. Accessories are supplied separately.

About Our Stock

We specialise in supplying new and unused surplus pumps. All units are inspected prior to dispatch and supplied with guarantee.