Roll over image to zoom
SKU: 93209293
Grundfos NB 50-125/125 Cast Iron 0.55 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
Air handling unit water feeds and thermal exchange manifolds use the Grundfos NB 50-125/125 end-suction pump. The unit couples a 0.55 kW drive motor to an axial DN 65 inlet nozzle and a radial DN 50 discharge connection.
Fluid delivery performance provides 540 L/Min rated flow with a maximum developed head of 3.932 m. Volute casing construction features EN-GJL-250 cast iron with cataphoretic electrocoating, paired with a stainless steel impeller and BQQE shaft seal. Product net weight equals 40 kg.
Electric power input of 415 V across three phases provides 0.55 kW output at a current draw of 1.23 Amps. Operating limits support liquid temperatures from -25°C to 120°C and maximum system pressures of 16 bar. Flanged pipework attaches via DN 65 inlet and DN 50 outlet ports.
Physical drive protection includes an IP55 enclosure rating and Class F thermal insulation. Standard motor installation requires external electrical overload protection. The back-pull-out design allows complete drive and rotating assembly extraction while leaving the casing secured to distribution pipework.
Features
- Replaceable wear rings protect casing hydraulics and retain designed pumping clearances.
- Solid stub shaft and ball bearing arrangement counteracts operating mechanical stresses.
- Standardized PN16 dimensions per EN1092-2 align with facility pipe headers.
- IEC standardized electric drive rated for continuous S1 operation in ambients up to 40°C.
- Back-pull-out arrangement allows fast access to motor and impeller without disturbing pipework.
- Precision balancing of rotating parts delivers quiet, low-vibration fluid transfer.
- Heavy-section cast iron volute with integral mounting pads provides solid base support.
SPECIFICATIONS
| Max Flow | 540 L/Min |
| Max Head | 3 m |
| Power | 0.55 kW / 415v |
| Rated Current | 1.23 Amps |
| Suitable For | Cooling Tower Hydronic Systems |
| 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 three-phase voltage and motor power rating operate this pump?
Running on a 415 V three-phase supply, the Grundfos NB 50-125/125 features a 0.55 kW motor drawing 1.23 Amps with IP55 enclosure protection.
What maximum pumping rate and vertical head can this pump develop?
Supplying up to 540 L/Min in liquid flow and 3.932 m in dynamic head, the NB 50-125/125 accommodates diverse operating conditions.
How hot or cold can the pumped fluid be during regular operation?
The NB-50-125-125 safely accommodates pumped fluid temperatures from -25°C to 120°C under working pressure limits up to 16 bar.
Which inlet and outlet port sizes are engineered onto this pump volute?
Pipe connections on the NB 50 125 125 consist of an axial 65 mm inlet and a radial 50 mm outlet meeting PN16 flange standards.
How is the pump volute built to resist mechanical and hydraulic stress?
High-grade EN-GJL-250 cast iron forms the casing of the NB/50/125/125, housing a stainless steel impeller for lasting service.
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