Blue Sea Systems 3003 HD-Series Heavy Duty Selector Battery Switch with AFD

Blue Sea Systems 3003 HD-Series Heavy Duty Selector Battery Switch with AFD

HD-Series Heavy Duty Selector Battery Switch with AFD, rated 400A continuous to a maximum of 32V DC. Make-before-break contact design allows switching between battery banks without power interruption.

Features:

• Includes AFD (Alternator Field Disconnect)
• Ignition protected—safe for installation aboard gasoline powered boats
• Case design allows surface or rear panel mounting
• Accepts two 4/0 AWG (95mm²) battery cables

Installation Notes:

• Terminal Stud Torque: 220 in-lb (24.86 Nm)
• Cable Size to Meet Ratings: 4/0 AWG (120mm²)
• Mounting Holes: Accept 1/4" (M6) Screw

Why Choose This Battery Switch?

• Isolates the bank for safe service and for leaving the boat unattended
• Protects against a dead start battery by keeping banks separate in normal use
• Rated for the cranking surge an engine draws, not just the running load
• A standard, inspectable point of disconnect that a surveyor expects to find

Specifications:

• Switch Type: Selector 4 Position
• Color: Grey
• Switch Positions: 4
• Battery Combine: Yes
• Alternator Field Disconnect: Yes
• Maximum Voltage: 32V DC
• Continuous Rating: 400A
• Intermittent Rating: 700A (5 min)
• Starting Rating 30 sec: 1600A
• Battery Inputs: 2
• Cable Clearance For 4/0 AWG Cables: 1.10in (27.94 mm)
• Cable Quantity to Meet Ratings: Two Cables / Terminal
• Stud Material: Tinned Copper
• Switching Rating: 25A
• Terminal Stud Size: 1/2" (M12)
• Weight: 1.25lb (0.57 kg)