SKU: 42040113719

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 Aug 4 - Aug 9

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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: 42040113719

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4.2 ★★★★★
Based on 10 reviews
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Verified Purchase
Jason D. Carroll
Lowell, US
★★★★★ 5
POLYESTER?!?!
Color: Ivory, Size: 2' x 3' (Pelt), Color: Ivory, Size: 2' x 3' (Pelt)
POLYESTER?!?! So i just bought several of these. Nice and big and fluffy, looked very clean, very nice. Cats instantly were scared/curious. The back of the skin, the wool, all looked nice, and then I noticed it had a tag on it... The tag says... 100% POLYESTER! What?!?!? This is supposed to be New Zealand Sheep Skin pelt! Shouldnt be any Polyester at all. So, just before I was about to return it, i did a small burn test. I cut off a small bunch of hair and burned it. The fire tried to light but it quickly extinguished itself. And the smell... yes... the smell told me it is REAL WOOL and the fact the fire went out right away also confirms this is not oil based. THIS IS REAL, This is NOT Polyester. I guess also a lot of ppl are returning because of the tag, so these are at a HUGE DISCOUNT!!! BUY THEM UP!!! They also came in vacuum packed bags, looked nice and kept very nice. These are excellent! See my photos, the tag, the burned bunch of hair... fire went out, i tried it three times, fire kept instantly going out... smells organic like animal hair when burned, not like oil/polyester. ENJOY!!! I PAID FOR THESE, I was not given anything here!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 1, 2025
D
Verified Purchase
Dee
Carnegie, US
★★★★★ 5
Love this product!
Color: Linen, Size: 2' x 3' (Pelt)
This sheepskin elevated a boring leather couch to a luxurious sitting space! I purchased 2, one for each loveseat, as sometimes the leather is a little cold. The sheepskin with a small lumbar pillow and voila! A cozy place everyone gravitates to! The sheepskin is soft and cozy and everyone comments they want one! ha probably will get this as a couple of gifts (for those guests that said they wanted one too)
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 15, 2026
L
Verified Purchase
Laney
Pawtucket, US
★★★★★ 5
Perfect sheepskin rug
Color: Ivory, Size: 2'3" x 3'5" (Large Pelt)
This sheepskin rug is fabulous! I have it over my office chair and I LOVE it. It does not shed, it stays in place and fits over the seat and up the entire back of the chair with a bit remaining to hang over the edge. My cat sleeps on it every chance he gets. Great value for the price! Just looking at it brings me joy, such a beautiful sheepskin.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
F
Verified Purchase
FRECKLEFRACK
Boise, US
★★★★★ 5
Dog ignores, but I like
Color: Ivory, Size: 2' x 3' (Pelt), Color: Ivory, Size: 2' x 3' (Pelt)
I bought this for my dog, who is old and has creaky joints. My dog prefers to continue resting in uncomfortable places that put my plants in peril. He does not ever recline on this dead sheep and looks at me as though I am the sheep slaughterer. Spouse asked if it came in bigger sizes. Since this is the skin of a dead sheep, it depends on live sheep girth. Anything bigger would likely have to be sewn together from multiple dead sheep. I find the girth of this sheep pelt perfectly acceptable. It is nice and thick and soft and fairly easy to vacuum. I frequently recline on it when stretched out on the floor, and am grateful it does not leave a mess or make noise like my dog, who should be grateful that his pelt is still attached to his body.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 4, 2024
S
Verified Purchase
Sound Diva
Los Angeles, US
★★★★★ 1
SHRINK Wrapped. NO Customer Support.
Color: Ivory, Size: 2' x 3' (Pelt)
These arrived shrink wrapped and when put down as throw rugs, are lumpy. They are a little less so after 10 minutes on air fluff in the dryer. They look nice and fit my bedroom well but I’m concerned about walking over them since I prefer a level surface that is even. Customer support does NOT exist. There appears to be a chat option but there are no responses. Reading other information, I’ve decided to try a metal comb. So now I’m waiting for that to arrive. If it wasn’t so difficult to deal with the size difference, I would have simply returned them. I may still and just purchase a return container.
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Reviewed in the United States on January 3, 2026

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