Atlas Copco WEDA D04BN | Drainage Submersible Pump — Bottom Discharge, 0.5 HP, 115V 1-Phase, 1" Discharge

Where reliable pumping performance matters most, the Atlas Copco WEDA D04BN is a 0.5 HP (0.4 kW) drainage pump engineered to handle clean or lightly dirty water at water densities up to 68 lb/ft³, delivering up to 42 gpm at a maximum head of 39 ft. This Bottom Discharge variant features a narrow 1" outlet positioned at the bottom of the pump body, allowing it to be lowered into manholes and narrow pipes where a standard side-discharge pump cannot fit.

Performance at a Glance

The WEDA D04BN is built around a 3,500 RPM high-speed design, with a 1" NPT discharge connection and a maximum solids-handling capability of 0.18". Whether you need to clear a flooded trench or maintain continuous dewatering on a long-term project, this pump delivers consistent, trouble-free performance on 115V Single-Phase power.

Technical Specifications

Key Features

• WEDA+ Protection System: Built-in rotation control, phase-failure protection, and thermal switches in every winding protect the motor automatically without external control panels
• Corrosion-Resistant Aluminum Alloy Body: Unique alloy provides the ideal combination of strength, light weight, and corrosion resistance for demanding site conditions
• Flexible Discharge Orientation: Discharge can be mounted vertically or horizontally to suit confined spaces or existing pipework layouts
• Modular Sealing System: Sealing configuration is matched to pump size to provide the optimal protection level for each application
• Class F Motor Insulation: Thermal switches in every winding guard against overheating; improved cable sealing prevents water ingress at the cable entry
• Adjustable Rubber Diffuser: Wear-resistant, adjustable diffuser maintains peak hydraulic efficiency over the service life of the pump
• Power Supply: 115V single-phase — plugs into a standard 115V outlet; no special wiring required.
• Safety Certification: Listed to UL electrical safety standards for North American markets.

Built-In WEDA+ Motor Protection

Every WEDA D-series pump includes the WEDA+ protection system as standard: automatic rotation control prevents the pump from running in reverse after power interruptions; phase-failure protection shuts down the motor immediately if a phase is lost; and individual thermal switches in each motor winding provide independent overtemperature protection — all without requiring an external control panel.

Ideal Applications

• Construction site dewatering and groundwater removal
• General building and foundation drainage
• Raw water transfer and intake pumping
• Mine drainage and tunnel dewatering
• Flood emergency response and storm water management
• Municipal and industrial wastewater handling
• Narrow manhole and pipe access where a standard 2-inch outlet is too large to lower the pump

The WEDA D04BN is backed by Atlas Copco's global service and parts network. Genuine service kits — including seal kits, instant service packs, and wear part kits — are available to restore the pump to factory performance at any time. Optional accessories include control panels, discharge connections, level regulators, float switches, slim adapters, and zinc anodes for saltwater applications.

Part Number: WEDA D04BN  |  SKU: 8162172800  |  Power: 115V Single-Phase  |  Max Flow: 42 gpm  |  Max Head: 39 ft. For full performance curves and dimensional drawings, see the Atlas Copco WEDA Submersible Pump Range Brochure (60 Hz).