Blue Sea Systems 9002E 4-Position Battery Switch with Alternator Field Disconnect (AFD), 32V DC, 325A

The Blue Sea Systems 9002E is a 4-position battery selector switch built to manage two isolated battery banks aboard a boat, with a built-in Alternator Field Disconnect (AFD) to protect the alternator if the switch is turned to OFF while the engine is running. The 4-position rotary dial lets the operator select Battery 1, Battery 2, Both, or OFF, so isolated banks can be run independently or combined to power all loads as needed. The switch is ignition protected, so it can be mounted in the engine room of gasoline powered boats as well as in dry electrical panel spaces.

Construction uses a durable plastic housing with a rotary knob that has a tactile texture, allowing the operator to confirm switch position by feel in low light or no-light conditions. The terminal studs are one-piece tin-plated copper, long enough to accept multiple cables while providing the torque needed for a secure, low-resistance connection. The switch offers multiple mounting options and can be installed on the surface of a panel or from the rear of a panel, with a 32 mm mounting hole. The housing carries an IP66 ingress protection rating for resistance to dust and heavy water spray, making it suitable for engine room and helm installations where moisture exposure is a concern.

Specifications

• Brand: Blue Sea Systems
• Manufacturer Part Number: 9002E
• Switch Configuration: 4-Position Selector
• Alternator Field Disconnect (AFD): Included
• Operating Voltage: 32 Volts DC
• Current Rating: 325 Amps
• Switch Type: Rotary
• Mounting Type: Panel Mount (Surface or Rear of Panel)
• Mounting Hole Diameter: 32 mm
• Item Dimensions: 3.85 x 3.85 x 3.1 inches
• Terminal Studs: One-piece tin-plated copper, 7/8 inch long
• Contact Material: Copper
• Material: Plastic
• Color: Red
• Ingress Protection Rating: IP66
• Ignition Protected: Yes
• Weight: 1.3 pounds
• UPC: 632085900250

Frequently Asked Questions

What does the AFD on the Blue Sea Systems 9002E do? The Alternator Field Disconnect (AFD) on the 9002E protects the alternator if the switch is turned to the OFF position while the engine is running, preventing damage that can occur when an alternator loses its battery connection under load.

How many battery banks can the 9002E manage? Two isolated battery banks can be managed with the 9002E, a 4-position selector switch that lets the operator choose Battery 1, Battery 2, Both, or OFF.

Can the Blue Sea Systems 9002E be mounted in a gasoline engine room? Yes, the 9002E is ignition protected, so it is rated for mounting in the engine room of gasoline powered boats as well as in a standard electrical panel.

What are the mounting options for this switch? The 9002E can be installed on the surface of a panel or mounted through the rear of a panel, using a 32 mm mounting hole.

What size cables fit the terminal studs on the 9002E? The 9002E uses one-piece tin-plated copper terminal studs that are 7/8 inch long, long enough to accept multiple cables while still allowing the torque needed for a secure, low-resistance connection.

Is the 9002E waterproof? The 9002E carries an IP66 ingress protection rating, meaning it is protected against dust ingress and powerful water jets, which suits engine room and helm mounting locations.

What is the difference between the Blue Sea Systems 9002E and the 9001E? Both the 9002E and 9001E are 4-position selector switches, but the 9002E includes the Alternator Field Disconnect (AFD) feature while the 9001E does not.

What voltage and current is the 9002E rated for? The 9002E is rated for 32 Volts DC at 325 Amps.

How does the operator know which position the 9002E switch is in without looking? The rotary knob on the 9002E has a tactile texture on its face, letting the operator confirm the selected position by feel in low light or no-light conditions.

What material is the Blue Sea Systems 9002E made of? The housing of the 9002E is plastic, with copper contacts and one-piece tin-plated copper terminal studs.

How much does the 9002E battery switch weigh? The 9002E weighs 1.3 pounds.

What are the physical dimensions of the 9002E? The 9002E measures 3.85 x 3.85 x 3.1 inches.