Overview
The Grundfos SQ 3-65 submersible pump is a proven 3-inch multi-stage submersible groundwater pump designed for residential and light commercial applications. This single-phase unit operates at 200-240V with a rated power of 1.15 kW and delivers consistent flow for domestic water supply, irrigation, tank filling, and small waterworks. The pump’s compact 76 mm outer diameter allows installation in narrow boreholes without specialized tools.
Key Features
- Floating impellers with tungsten carbide/ceramic bearings for durability and smooth operation
- Dry-running protection safeguards against damage from operating without water
- Multi-stage protection: overvoltage, undervoltage, overload, overtemperature, and anti-upthrust
- Soft-start electronics reduce stress on pump components and electrical service during startup
- Permanent magnet motor design ensures optimum efficiency across a wide load range
- Stainless steel construction (AISI 316) for corrosion resistance in challenging environments
- 1.5 m cable included with direct-on-line motor connection and replaceable end cover
Technical Specifications
- Pump size: 3-inch (76 mm minimum borehole diameter)
- Rated flow: 3 m³/h (approximately 500 gph)
- Rated head: 70 m maximum
- Motor type: MS3-N single-phase permanent magnet
- Rated power: 1.15 kW (1.65 kW input)
- Supply voltage: 200-240V AC 1Ph
- Rated current: 8.4 A
- Frequency: 50 Hz (compatible with 50-60 Hz depending on model variant)
- Pump outlet: Rp 1¼ inch BSP
- Motor speed: 10,700 rpm
- Net weight: 6.6 kg
- Cable length: 1.5 m standard (custom lengths available)
- Enclosure class: IP68
- Insulation class: F
- Approvals: CE, UL, CUL
- Maximum liquid temperature: 35 °C
Typical Applications
- Domestic water supply from wells and boreholes
- Irrigation systems and garden watering
- Tank filling and pressure boosting
- Small waterworks and community water systems
- Groundwater lowering and dewatering
- Environmental applications requiring reliable submersible duty
Compatibility & Replacements
Compatible With
- Standard well and borehole installations with 3-inch (76 mm minimum) casing
- Single-phase AC power supplies rated 200-240V 50-60 Hz
- Rp 1¼ inch BSP thread pump outlet connections
- Vertical, horizontal, or angled borehole installations
- External level monitoring systems for low water level protection
Replaces / Drop-In Replacement For
The Grundfos SQ 3-65 replaces previous generation SQ series 3-65 models and is compatible with many legacy submersible pump installations requiring 1.15 kW, 3-inch diameter pump units. Verify motor model number and electrical specifications with your system integrator before ordering to ensure drop-in compatibility.
Works With
- Grundfos control and monitoring systems
- Standard pressure tanks and hydro-accumulators
- Single-phase motor protection relays and soft-starters
- Electrical conduit and weatherproof disconnect switches rated for 240V
- Well-seal installation kits for 3-inch boreholes
