Blue Sea Systems 9003E e-Series Battery Switch, Single Circuit On-Off, 350A, 48V DC, Red

The Blue Sea Systems 9003E e-Series Battery Switch is a single circuit ON-OFF rotary switch built to control power from one battery bank on a boat's electrical system. Turning the red textured knob connects or disconnects the circuit, letting you isolate the battery bank for maintenance, winter storage, or general safety when the boat is not in use. The textured knob and face are designed so the switch can be operated by feel in low light conditions.

Construction is a durable plastic housing rated IP66 for protection against dust and heavy seas or wash-down water, and the switch carries a 350 amp continuous current rating at 48 volts DC. Terminal studs are tinned copper to resist corrosion in a marine environment and are designed to accept multiple cable connections for secure, low resistance contact. The switch supports both surface mounting and rear panel mounting, giving installers flexibility in tight helm or engine room spaces.

This is a single circuit switch only, controlling one isolated battery bank; it does not combine circuits and does not include an alternator field disconnect. Overall dimensions are 2.9 x 6.38 x 8.63 inches and the switch weighs 1.3 pounds.

Specifications

• Brand: Blue Sea Systems
• Manufacturer Part Number: 9003E
• Product Name: Battery Switch 'E' On-Off
• Switch Type: Rotary, Single Circuit
• Operation Mode: ON-OFF
• Number of Positions: 2
• Current Rating: 350 Amps
• Operating Voltage: 48 Volts DC
• Contact Material: Tinned Copper
• Material: Plastic
• Color: Red
• Mounting Type: Panel Mount or Surface Mount
• Ingress Protection Rating: IP66
• Dimensions: 2.9 x 6.38 x 8.63 inches
• Weight: 1.3 pounds
• Warranty: Limited Lifetime Warranty

Frequently Asked Questions

What does the Blue Sea Systems 9003E battery switch do? The 9003E is a single circuit ON-OFF rotary switch that turns one battery bank on or off, letting you isolate that circuit for maintenance or storage.

What is the current and voltage rating of the 9003E? The 9003E is rated for 350 amps at 48 volts DC.

Can the 9003E control two separate battery banks? No. The 9003E is a single circuit switch that controls only one isolated battery bank; it does not combine circuits.

Does the 9003E include an alternator field disconnect? No, this model of the Blue Sea Systems 9003E switch does not include an alternator field disconnect.

How is the 9003E battery switch mounted? The 9003E supports both surface mounting and rear panel mounting, allowing flexible placement in tight installation spaces.

What material is the 9003E switch made of? The housing is plastic, and the terminal studs are tinned copper for corrosion resistance and secure cable connections.

What are the dimensions and weight of the 9003E? The 9003E measures 2.9 x 6.38 x 8.63 inches and weighs 1.3 pounds.

Is the 9003E rated for water or dust exposure? Yes, the 9003E carries an IP66 ingress protection rating, suitable for wet marine environments.

What color is the 9003E battery switch? The 9003E is red with a textured knob and face designed to be operated by feel in low light.

What warranty comes with the 9003E? Blue Sea Systems backs the 9003E with a limited lifetime warranty.

How many terminal connections does the 9003E support? The tinned copper terminal studs on the 9003E are designed to accept multiple cable connections for secure, low resistance contact.