SKU: 44181811002

Blue Sea 300A Red Mini m-Series On/Off Battery Switch

Sale price$46.64 Regular price$51.82
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Ships within 48 hours · Estimated delivery Jul 29 - Aug 3

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Description

Blue Sea 300A Red Mini m-Series On/Off Battery SwitchBlue Sea m Series: Compact High Current Battery Isolation Reliable Power Management for Marine and RV Systems The Blue Sea Systems m Series Battery Switch solves the common challenge of installing high amperage isolation in tight spaces. Despite its compact footprint, this switch is engineered to handle significant power loads, making it an ideal choice for switching a single battery to a single load group in boats, caravans, and 4WD setups. Unlike

Blue Sea m-Series: Compact High-Current Battery Isolation

Reliable Power Management for Marine and RV Systems

The Blue Sea Systems m-Series Battery Switch solves the common challenge of installing high-amperage isolation in tight spaces. Despite its compact footprint, this switch is engineered to handle significant power loads, making it an ideal choice for switching a single battery to a single load group in boats, caravans, and 4WD setups.

Unlike generic switches that often suffer from voltage drop or overheating under load, the m-Series features tinned copper studs for maximum conductivity and corrosion resistance. It is rated for 300A continuous current, with an impressive intermittent rating of 500A (5 minutes) and a cranking rating of 900A (30 seconds), ensuring it can handle engine starting surges without failure.

Ignition Protected for Safety

Safety is paramount in marine electrical design. This switch is ignition protected, meaning it is safe for installation on gasoline-powered boats. It prevents internal sparks from igniting fuel vapours, a critical risk reduction feature for engine rooms and fuel locker installations. The casing is also designed to IP66 standards (when properly mounted), protecting internal contacts from harsh marine environments.

Versatile Mounting and Installation

Installation flexibility is a standout feature of the m-Series. The case design allows for three mounting options: surface, front panel, or rear panel mounting, accommodating various console and bulkhead thicknesses. The isolating cover includes snap-on sections to protect rear contacts, ensuring compliance with ABYC requirements.

The switch features 3/8"-16 (Approx. M10) terminal studs which accept ring terminals comfortably. To accommodate heavy cabling, the design provides ample clearance for cables up to 4/0 AWG (Approx. 120mm²).

Future-Proof Voltage Handling

While commonly used in 12V battery systems, this switch is rated for a maximum of 48V DC. This makes it fully compatible with modern 24V and 48V lithium battery banks often found in advanced off-grid energy systems and electric propulsion setups.

Key Features

  • High Current Capacity: 300A continuous and 900A cranking rating in a compact "mini" size.
  • Ignition Protected: Safe for installation aboard petrol-powered vessels.
  • Wide Voltage Range: Suitable for 12V, 24V, and up to 48V DC systems.
  • Conductive Design: 3/8"-16 (Approx. M10) tinned copper studs for maximum conductivity and corrosion resistance.
  • Flexible Mounting: Surface, rear, or front panel mounting options with snap-out isolation covers.
  • Tactile Operation: Robust knob with positive click-stop positions for clear ON/OFF status.

Secure Your Electrical System

Ensure your vessel or vehicle is equipped with a master switch that meets professional safety standards. Install the Blue Sea m-Series Switch today for reliable circuit isolation and peace of mind on the water or the road.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 44181811002

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Aysha Harris
Chelsea, US
★★★★★ 5
Happy with purchase
Model: 17986N, Model: 17986N
Delivery was on time as you can see in the picture the big difference I got the starter put on the car still won’t start that has nothing to do with the starter I’m actually about to order a fuel pump for Amazon and I will be reviewing that as while great product for a good price, thank you
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Reviewed in the United States on May 19, 2026
J
Verified Purchase
Jill Williams
Grantham, US
★★★★★ 4
Good fit.
Model: 10914N
The starter that I ordered was exactly what the description said. The starter fit my car and it is now running again. There is just one thing that did not happen with this order. I ordered this paticular part because it stated if you order within the next 4 hours it will be delivered between 4am and 8 am howwver it was not delivered ubtil 4:30 pm.
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Reviewed in the United States on March 19, 2026
C
Verified Purchase
Carl Pontiak
New York, US
★★★★★ 5
Excellent Starter
Model: 17825
Starter is an excellent Replacement for the OEM Starter. Easy installation after removing Air Flow inlet. Car is starting easily now and running smoothly after Fusible Link Block was replaced.
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Reviewed in the United States on April 22, 2026
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Verified Purchase
James V. Bailey II
Massapequa, US
★★★★★ 5
Good quality
Size: 32 oz, Style: 32 Fl Oz, Pattern Name: Lube
Good quality gear oil, works perfectly.
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Reviewed in the United States on April 29, 2026
C
Verified Purchase
Carb was beautiful once I got it tune in, cranks great runs smooth I would buy it again if needed
Charlottesville, US
★★★★★ 5
For motorcycles
Size: 32 oz, Style: 32 Fl Oz, Pattern Name: Lube
Great stuff, good price
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Reviewed in the United States on April 25, 2026

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