Roll over image to zoom
SKU: 93209290
Grundfos NB 50-125/111 Cast Iron 3 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
Driven by a 3 kW electric motor, the NB 50-125/111 end-suction centrifugal pump features an axial suction port (DN 65) and a radial discharge port (DN 50). Specified for commercial HVAC circulation, district heating installations, and industrial process water distribution, the pump mounts securely onto floor inertia bases in mechanical plant rooms.
Hydraulic wet-end output delivers a rated flow volume of 1026 L/Min with a maximum operational head limit of 11.36 m. The EN-GJL-250 cast iron casing receives cataphoresis electrocoating to limit surface oxidation. Inside, a stainless steel impeller works alongside bronze wear rings and a BQQE shaft seal. Physical net weight measures 62 kg.
Electrical power for the NB 50-125/111 model is supplied by a 415 V three-phase electric motor rated at 3 kW output power. Nominal operating current draw measures 10.3 Amps during full load operations. Operating liquid temperatures span from -25°C to 120°C under 16 bar working pressure. Suction inlet measures DN 80 with a DN 50 discharge port.
Motor protection on the NB 50-125/111 pump complies with IP55 enclosure standards to resist dust and moisture ingress, supported by Class F thermal insulation and internal PTC thermistors. The back-pull-out casing layout allows service personnel to remove the motor drive and rotor assembly without unbolting the pump volute from system suction and discharge piping headers.
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 | 1026 L/Min |
| Max Head | 11.36 m |
| Power | 3 kW / 415v |
| Rated Current | 10.3 Amps |
| Suitable For | Commercial Chilled Water Circulation |
| Body Material | Cast Iron |
| Liquid Temperature | '-25°C to 120°C |
| Inlet Size | 65 mm |
| Outlet Size | 50 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.
What electrical power consumption, operating voltage, and current draw govern this large centrifugal unit?
The heavy induction motor of Grundfos NB 50-125/111 delivers 3 kW of shaft power, requiring a three-phase 415 V supply pulling 10.3 Amps.
What fluid temperature thresholds and maximum operating pressure apply to this heavy-duty unit?
Operating across primary energy loops, NB 50-125/111 safely circulates media from -25°C to 120°C at pressures to 16 bar.
Across regional primary hydronic loops, how much elevation pressure is sustained under load?
Dynamic head performance certified for NB-50-125-111 establishes a peak lift rating of approximately 11.36 m.
Moving high-temperature media through primary mains, how many liters per minute are displaced?
Across primary utility process piping, NB 50 125 111 delivers a maximum fluid discharge volume of approximately 1026 L/Min.
What casing metallurgy and closed stainless steel impeller are built into this end-suction pump?
Mechanical line rigidity in NB/50/125/111 is delivered by a foot-supported cast iron casing alongside a precision-cast bronze impeller.
Need help choosing the right pump?
Our team of pump experts are here to help you find the perfect solution for your application.
- Free expert advice
- Pump sizing & system recommendations
- Fast response — call or email us