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SKU: 93209250
Grundfos NB 40-125/139 Cast Iron 4 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
Specified for commercial building services, process water loops, and district cooling infrastructure, the NB 40-125/139 end-suction centrifugal pump incorporates DN 65 suction and DN 40 discharge flanged ports. The end-suction volute design connects directly to suction line headers and concrete foundation bases.
At nominal operational speed, hydraulic output provides 734 L/Min flow throughput alongside a maximum head limit of 21.33 m. Structural construction incorporates an EN-GJL-250 cast iron body with cataphoresis surface finish. Internal components feature a stainless steel impeller and BQQE seal. Total net weight stands at 69 kg.
The NB 40-125/139 electric motor operates on a 415 V three-phase supply drawing 7.82 Amps rated current at 4 kW output power. Fluid handling parameters accommodate liquid temperatures between -25°C to 120°C up to 16 bar system pressure. Line connection uses opposite DN 65 inlet and DN 40 outlet flanged ports.
Enclosure protection on the NB 40-125/139 model meets IP55 standards while motor windings feature Class F insulation and PTC thermistor protection relays. Maintenance technicians can extract the drive unit using back-pull-out access without removing the cast iron volute casing from connected plant room piping manifolds.
Features
- High-efficiency motor selection is configured to match the specific power supply characteristics, pumping environment and liquid properties of each installation.
- Back pull-out design allows complete rotating assembly removal including motor, coupling and impeller without disturbing pump housing or connected pipework.
- EN733 and ISO2858 dimensional compliance ensures interchangeability with other standard end-suction pumps across commercial and industrial installations.
- ATEX Zone 1, 2, 21 or 22 certification available for operation in potentially explosive atmospheres (except E-model variants).
- Integrally cast suction and discharge ports with dedicated vent and drain ports provide direct connection points without additional fittings.
- No baseplate or grouting required to maintain correct shaft alignment and vibration levels within Hydraulic Institute standards.
- Cataphoretic electrocoating on cast iron internal surfaces provides barrier protection against oxidative corrosion in hydronic circulation loops.
IMPORTANT:Bulk freight charges apply. Please contact us for a freight quote before ordering.
SPECIFICATIONS
| Max Flow | 734 L/Min |
| Max Head | 21.33 m |
| Power | 4 kW / 415v |
| Rated Current | 7.82 Amps |
| Suitable For | Commercial Chilled Water Circulation |
| Body Material | Cast Iron |
| Liquid Temperature | '-25°C to 120°C |
| Inlet Size | 65 mm |
| Outlet Size | 40 mm |
| Warranty | 24 Months |
Warranty & Returns
All products supplied by Foundation Pumps are covered by a minimum 12-month warranty unless otherwise stated. Some brands may offer longer manufacturer warranties. Warranty covers manufacturing defects, faulty materials and workmanship under normal use.
- Products must be installed correctly and in accordance with the manufacturer’s instructions.
- Warranty does not cover incorrect installation, misuse, dry running, normal wear and tear, unauthorised repairs or damage caused by external factors.
- Proof of purchase, photos, videos and installation details may be requested when assessing a warranty claim.
- The customer is responsible for returning the product to Foundation Pumps or the nominated service centre unless otherwise agreed.
- Removal, reinstallation, labour and associated site costs are generally the customer’s responsibility unless required under Australian Consumer Law.
- Change-of-mind returns may be accepted within 30 days provided the product is unused, uninstalled and returned in its original packaging.
- Customers are responsible for return freight costs for change-of-mind returns.
- Restocking fees may apply to special-order, bulky or non-stocked products.
- Used, installed or specially ordered products may not be eligible for change-of-mind returns.
- If a product arrives damaged or faulty, please contact Foundation Pumps as soon as possible so we can assist with the appropriate repair, replacement or refund.
Your rights under Australian Consumer Law are not affected.
Within multi-building energy stations, how much liquid throughput does this pump displace?
Within multi-building energy stations, Grundfos NB 40-125/139 delivers a maximum volumetric flow rate of approximately 734 L/Min.
What metallurgy specifications govern the pressure containment envelope of this unit?
Resisting internal oxidation across process lines, NB 40-125/139 utilizes an electrocoated cast iron body with a durable stainless steel impeller.
How much electrical energy in kilowatts, incoming supply, and amperage does this unit consume?
Electrical feeds must provide a three-phase 415 V supply for NB-40-125-139, whose 4 kW motor pulls 7.82 Amps at full capacity.
Within multi-building energy stations, what media thermal limits and line pressure are supported?
Process liquid temperatures spanning -25°C to 120°C are safely circulated by NB 40 125 139 under line pressures reaching 16 bar.
Within multi-building boiler facilities, what total dynamic elevation height is developed?
Within central facility plant rooms, NB/40/125/139 develops a peak dynamic elevation column of approximately 21.33 m.
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