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SKU: 93209252
Grundfos NB 40-125/142 Cast Iron 0.55 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
Featuring an end-suction structural layout with DN 65 axial suction and DN 40 radial discharge ports, the NB 40-125/142 pump processes clean liquid media across active HVAC circuits. Powered by a 0.55 kW electric motor, the system operates across continuous commercial pumping cycles.
The hydraulic wet-end achieves a rated flow capacity of 406 L/Min with a maximum head rating of 5.275 m. Cast iron housing materials provide solid pressure containment up to 16 bar. The internal assembly houses a stainless steel impeller fitted with bronze wear rings. Net equipment weight is 38 kg.
Power specifications for the NB 40-125/142 end-suction pump call for a 415 V three-phase electrical supply rated at 0.55 kW motor power. Current draw under load measures 14 Amps. Operating fluid temperatures span -25°C to 120°C with a maximum working pressure rating of 16 bar. The housing features DN 65 axial suction and DN 40 radial discharge ports.
The NB 40-125/142 electric motor carries an IP55 ingress protection rating alongside Class F thermal insulation and integrated PTC thermistors. System maintenance relies on back-pull-out architecture, enabling drive head disassembly while the pump volute stays secured to concrete foundation bases and pipe runs.
Features
- 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.
- Close-coupled configuration eliminates coupling alignment procedures and reduces overall installation footprint compared to long-coupled alternatives.
IMPORTANT:Bulk freight charges apply. Please contact us for a freight quote before ordering.
SPECIFICATIONS
| Max Flow | 406 L/Min |
| Max Head | 5.27 m |
| Power | 0.55 kW / 415v |
| Rated Current | 2.16 Amps |
| Suitable For | District Heating & Cooling Networks |
| 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.
How do the electrocoated cast iron volute and precision impeller resist operational fatigue?
Volute pressure integrity in Grundfos NB 40-125/142 is maintained by an EN-GJL-250 cast iron housing paired with a precision-cast bronze impeller.
Which motor power capacity, electrical voltage, and full load running current are certified?
The robust electric drive of NB 40-125/142 delivers 0.55 kW of rotational power on a three-phase 415 V connection at 2.16 Amps.
Under rated full-load conditions, what fluid operating temperature range is permitted on site?
The mechanical seal design in NB-40-125-142 maintains tight fluid containment across -25°C to 120°C under pressures up to 16 bar.
Under unrestricted header flow, what maximum dynamic pressure head does this unit maintain?
Under full mechanical motor drive, NB 40 125 142 provides an operational dynamic head of approximately 5.27 m.
Under rated full-load conditions, what maximum volumetric circulation is certified on site?
Under rated full-load conditions, NB/40/125/142 maintains a peak liquid discharge throughput of approximately 406 L/Min.
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