Grundfos SB 3-45 A Submersible Pump

The Grundfos SB 3-45 A submersible pump, reference 92712340, is a multi-stage pump designed for domestic and agricultural applications where efficient and reliable pressure boosting is required. This pump is ideal for use in rainwater harvesting systems, agricultural irrigation with surface water, and for improving water pressure in the home. Its submersible design makes it perfect for installations in tanks, cisterns, and shallow water wells.

Key Features:

The Grundfos SB 3-45 A is a multi-stage submersible pump that provides excellent pumping capacity and handling of clean water. It is designed to work in conjunction with an external controller, such as the Grundfos PM1 or PM2 models, allowing full control of the pump with an easy-to-use interface. These external controllers enable the pump's start and stop to be automated, optimising its performance and extending its lifespan.

Thanks to its construction with high-quality materials, such as PPO-20GF composite in the impeller and PP-GF30 in the pump housing, this pump is corrosion-resistant and has superior durability even in demanding conditions. The integrated motor protection ensures safe operation and prevents damage due to overheating or blockages.

Technical Data:

• Nominal flow rate: 3.01 m³/h.
• Nominal head: 33.4 m.
• Maximum head: 45 m.
• Number of impellers: 3.
• Maximum allowable particle size: 1 mm.
• Approvals: CE.
• Curve tolerance: ISO9906:2012 3B.
• Non-return valve: No.

This pump is capable of handling particles up to 1 mm in diameter, making it suitable for slightly dirty water, such as rainwater harvesting, without affecting its functionality. Additionally, with a maximum head of 45 metres, it is ideal for systems requiring additional pressure over long distances or heights.

Materials and Construction:

• Hydraulic body: Composite.
• Pump housing: PP-GF30 (Glass fibre reinforced polypropylene).
• Impeller: Composite PPO-20GF (Glass fibre reinforced polyolefin).

These materials not only offer excellent corrosion resistance but also reduce the weight of the pump, making it easier to handle and install. Despite its lightness, the pump remains extremely robust, ensuring a long lifespan even under frequent use conditions.

Installation and Operation:

• Ambient temperature range: -10 to 50 °C.
• Pumped liquid temperature: 0 to 40 °C.
• Maximum installation depth: 10 m.
• Outlet connection: G 1" (thread).
• Nominal connection pressure: PN 6.

The Grundfos SB 3-45 A is very easy to install, both in new applications and existing systems. With a maximum installation depth of 10 metres, it can be fully submerged in tanks or wells, providing a discreet and efficient water supply solution. Additionally, it includes a 15-metre cable that facilitates its connection to the power grid and comes equipped with a Schuko plug for direct use.

Liquids and Applications:

This pump is designed to pump clean water, with a temperature range of 0 to 40 °C and a pH range from 4 to 9. Its most common applications include:

1. Rainwater harvesting: Ideal for collecting and reusing rainwater in domestic or irrigation applications.
2. Domestic pressure boosting: Perfect for systems that need to improve water pressure in the home, especially in houses with water tanks or cisterns.
3. Agriculture and irrigation: Suitable for using surface water in drip irrigation or micro-sprinkler systems.

Electrical Data:

• Input power (P1): 0.9 kW.
• Nominal power (P2): 0.55 kW.
• Nominal voltage: 1 x 220-240 V.
• Network frequency: 50 Hz.
• Nominal current: 4 A.
• Starting current: 12 A.
• Nominal motor speed: 2800 rpm.
• Operating capacitor: 12 µF/450 V.
• Protection rating: X8.
• Insulation class: F.

The integrated motor protection ensures the pump is protected against situations that could damage its operation, such as overheating or overloads. This makes it a safe and efficient option for continuous use applications. Additionally, the integrated float allows for automatic water level control, further optimising its performance and energy efficiency.

Other Features:

• Net weight: 12.2 kg.
• Gross weight: 13.2 kg.
• Transport volume: 0.033 m³.
• Cable length: 15 metres.
• Plug: Schuko.