Calpeda N4 Long Coupled Centrifugal Pump
Calpeda N4 125-250E/A Long Coupled Centrifugal Pump 415v 50002680000
- Established 1975
- Trusted by thousands of customers
Calpeda N4 125-250E/A is a Calpeda 4-pole end-suction centrifugal pump with bearing bracket, part number 50002680000. It delivers up to 4000 l/min (240 m³/h) and a maximum head of 11 m (1.1 bar), driven by a 5.5 kW motor (three-phase 400 V 50 Hz (Calpeda pump-motor unit)).
The Calpeda N4 is the 4-pole (approx. 1450 rpm) version of the N single-stage end-suction centrifugal pump, with bearing bracket and back pull-out construction. Main dimensions and performance follow EN 733, with axial suction and radial delivery on top. Calpeda pairs the pump with a standard B3 motor on a baseplate with flexible coupling and guard.
More about this product
Calpeda N4 125-250E/A overview
Calpeda N4 125-250E/A is a Calpeda 4-pole end-suction centrifugal pump with bearing bracket, part number 50002680000. It delivers up to 4000 l/min (240 m³/h) and a maximum head of 11 m (1.1 bar), driven by a 5.5 kW motor (three-phase 400 V 50 Hz (Calpeda pump-motor unit)).
The Calpeda N4 is the 4-pole (approx. 1450 rpm) version of the N single-stage end-suction centrifugal pump, with bearing bracket and back pull-out construction. Main dimensions and performance follow EN 733, with axial suction and radial delivery on top. Calpeda pairs the pump with a standard B3 motor on a baseplate with flexible coupling and guard.
Specifications
| Model | Calpeda N4 125-250E/A |
|---|---|
| Calpeda part number | 50002680000 |
| Motor power (P2) | 5.5 kW (7.5 HP) |
| Supply | Three-phase 400 V 50 Hz (Calpeda pump-motor unit) |
| Max. flow | 4000 l/min (240 m³/h) at 4.4 m |
| Max. head | 11 m (1.1 bar) |
| Connections | DN 150 suction × DN 125 delivery |
| Liquid temperature | -10 °C to +90 °C |
| Ambient temperature | up to 40 °C |
| Total suction lift | up to 7 m |
| Max. working pressure | up to 16 bar (10 bar for some sizes; see the Calpeda data sheet) |
Performance
Total head at each flow, from the Calpeda N, N4 50 Hz data sheet (approx. rated speed, clean cold water).
| Flow (l/min) | Flow (m³/h) | Head (m) | Pressure (bar) |
|---|---|---|---|
| 0 (shut-off) | 0 | 11 | 1.1 |
| 1400 | 84 | 11 | 1.1 |
| 1600 | 96 | 10.8 | 1.1 |
| 1800 | 108 | 10.5 | 1 |
| 2000 | 120 | 10.1 | 1 |
| 2200 | 132 | 9.7 | 1 |
| 2500 | 150 | 9.1 | 0.9 |
| 2800 | 168 | 8.3 | 0.8 |
| 3000 | 180 | 7.8 | 0.8 |
| 3200 | 192 | 7.2 | 0.7 |
| 3500 | 210 | 6.2 | 0.6 |
| 4000 | 240 | 4.4 | 0.4 |
Construction and features
- Bearing-bracket end-suction pump with back pull-out construction for quick dismantling
- Axial suction and radial delivery on top; dimensions and performance to EN 733
- Flanged connections PN 10-16 to EN 1092-2
- Standardised mechanical seal to ISO 3069 (stuffing box on request)
- Rated speed approx. 1450 rpm (4-pole)
- Calpeda pump-motor unit: standard B3 motor (three-phase 400 V 50 Hz, IP55, IE3) on a baseplate with flexible coupling and coupling guard
Materials
| Component | Material |
|---|---|
| Pump casing | Cast iron GJL 250 EN 1561 (PN 10) / GJS 400-15 EN 1563 (PN 16) |
| Casing cover | Cast iron GJL 200 EN 1561 |
| Shaft | Steel 1.1191 EN 10083-2 (C45E) |
| Mechanical seal | Carbon / ceramic / NBR |
Applications
- Water supply
- Heating, air-conditioning, cooling and circulation systems
- Civil and industrial applications and agriculture
- Fire fighting applications
- Irrigation
- Clean liquids without abrasives that are not aggressive to the pump materials (solids content up to 0.2%)
Frequently asked questions
Technical data: Calpeda N, N4 data sheet, 50 Hz. Performance tolerances to UNI EN ISO 9906:2012.
-
Data Sheet PDFDownload
Standard delivery:
Standard delivery is free on most orders. Some items may incur a delivery charge depending on weight, size or value. Any applicable charge will be displayed at checkout.
Deliveries will typically be made between 7am and 6pm, Monday to Friday (excluding public holidays).
Next day delivery:
Next working day delivery is available for a £16.50 + VAT delivery charge.
Orders must be placed before 12 noon to qualify for next working day delivery. Orders placed after 12 noon on Thursday but before noon on Friday will be delivered the following Monday. Orders placed after 12 noon on Friday will be delivered on Tuesday.
Pallet/Large/Difficult items:
Some large, heavy or difficult to transport items may incur an additional delivery charge. Please contact us for a delivery quote before ordering.
Related products
Lowara NSCE cast iron centrifugal pump combining high efficiency with high flexibility regarding installation, material options and temperature. The new NSCE series is the natural…
Modern-design noiseless high-efficiency pumps, available in the HM version for domestic applications and in the HMS version for industrial applications (made entirely of AISI 316 stainless steel). HMZ version…
Lowara NSCE cast iron centrifugal pump combining high efficiency with high flexibility regarding installation, material options and temperature. The new NSCE series is the natural…
Lowara Resiboost Series of Variable Speed Electric Pumps and Pressure Booster Units. The single-phase Resiboost Watercooled variable speed electric pumps are designed for residential applications as they…
Lowara ESHE 230v 2900rpm 316 stainless steel centrifugal pump combining high efficiency with high flexibility regarding installation, material options and temperature. The new ESHE series is the natural choice…
Lowara NSCE cast iron centrifugal pump combining high efficiency with high flexibility regarding installation, material options and temperature. The new NSCE series is the natural…
Frequently Asked Questions
Quick answers to common questions about the Calpeda N4 125-250E/A Long Coupled Centrifugal Pump 415v 50002680000. For technical specifications, see the product details above; for sizing or installation advice, contact our team. If you have any other questions, we're happy to help.
What are centrifugal pumps used for?
Centrifugal pumps use a rotating impeller to move liquids and are commonly used for water transfer, circulation and industrial processes.
How do I choose a centrifugal pump?
Compare the required flow rate, total head, liquid characteristics and electrical supply with each pump’s performance curve.
Are centrifugal pumps suitable for dirty water?
Some are designed for clean water only, while others handle solids or wastewater. Check the particular pump’s permitted liquid and solids specification.
What types of Calpeda pumps can I explore?
Calpeda produces pumps for water supply, pressure boosting, drainage and circulation. Choose a model according to the required flow, head and liquid.
Are Calpeda pumps suitable for commercial installations?
Yes. Calpeda offers pump ranges for domestic, commercial and industrial duties; suitability depends on the individual model and duty point.
How do I choose a replacement Calpeda pump?
Check the existing pump model, supply voltage, connection dimensions, flow rate and required head before selecting a replacement.