BLUE SEA SYSTEMS HD Battery Switch 3Pos 500A W/Fd – 3003

Description

The Blue Sea Systems 3003 Heavy-Duty Battery Switch is a robust 3-position selector switch designed for managing dual battery banks. Rated for continuous 500A operation, this switch features a built-in field disconnect to protect alternators during switching-ensuring safe operation even under load. Its “Make Before Break” design allows seamless switching between battery banks without interrupting power flow.

Ideal for marine, RV, and off-grid applications, this surface-mount switch is built with tinned copper contacts and a reinforced polycarbonate case to withstand harsh environments and high-current loads.

Key Features

• 3-position selector: Battery 1 – BOTH – Battery 2

• Rated for 500A continuous / 900A intermittent

• Integrated alternator field disconnect to prevent damage during switching

• “Make Before Break” contact design ensures uninterrupted power

• Ignition protected – safe for use in gasoline engine compartments

• Heavy-duty copper contacts for maximum conductivity and durability

Specifications

• Part Number: 3003

• Switch Type: Manual Battery Selector

• Positions: 3 (Battery 1 – BOTH – Battery 2)

• Continuous Rating: 500A

• Intermittent Rating (5 min): 900A

• Voltage Rating: 48V DC max

• Field Disconnect: Yes (automatically opens alternator field during switching)

• Stud Size: 3/8″-16 tinned copper studs

• Ignition Protected: Yes (SAE J1171 compliant)

• Mounting Style: Surface mount

• Enclosure Material: Reinforced polycarbonate (UL 94-V0 rated)

• Ingress Protection: IP66 (dust-tight and water-resistant)

• Dimensions: 5.50″ L × 5.50″ W × 3.25″ D

• Standards Compliance: UL 1107, CE, ISO 8846 Marine