Can electricity flow in both directions through this circuit breaker - charge and discharge?

It is basically an inline fuse. I have mine with the source being my panels and a fuse placed before going into my charge controller. I am running one unit on both + and - of the solar panel before it goes into charge controller and I also run one unit on both + and - as it exits my charge controller going to the battery bank. using 4 units total. Which direction you wish to direct your electrical current should not mater, if the amps surge it should trip the fuse. Just put it in front of the unit you are trying to protect. In my case protecting solar charger from solar panels before going into solar charge controller and from battery bank before going in to solar charge controller.

Will 3/8"lugs work on this

Yes, use a star washer to secure the larger lug.

what size is recommended for a 3500 watt set up?

Ryan, I do not know if you are talking about pulling 3500 watts DC or if you are connecting and inverter 3500 watt from DC. If you are talking about use a 3500 ac watts inverter, I need to know at whar voltage ia the DC in for the inverter. The amps at 12v , 24v , 36v and 48v are differents, in the inveeter, at higher to increase from DC to AC in the inverter, higher will be the amps it pull from the batteries that can be in serie for those DC voltage. If you are pulling 3500 watts in DC from batteries, just calculate an average of 100 watts per amp. 3500 watts can be 350 amps.

I am looking for a drawing of the hole pattern to incorporate the parts in an assemlby kit. do you have a step file or such of the part.

L 3" x W 1 3/4" H 1 1/4" mounting holes are 1 1/2" diagonal. Make sure you read other people questions just not the reviews. Cheers

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3 Pack 300A Circuit Breaker with Manual Reset Fuse Holder for Car Audio Marine Boat Stereo Switch, with Wire Lugs Copper Washer

3 Pack 300A Circuit Breaker with Manual Reset Fuse Holder for Car Audio Marine Boat Stereo Switch, with Wire Lugs Copper Washer

Product ID: 445725368

Details

Brand
Hamolar
Circuit Breaker Type
Standard
Current Rating
300 Amps
Mounting Type
Panel Mount
Product Dimensions
43D x 49W x

⚡300A high current capacity

🔄Manual push-button reset & kill switch

🌡️Wide temp range -32°C to 82°C

ƒ302

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Description

⚡ Reset Your Power Game — Stay Protected, Stay Ready!

BUILT TO ENDURE - Crafted with copper washers and wire lugs for superior conductivity and heat resistance.
RESET DONT REPLACE - Forget fuse swaps—reset instantly with a sleek push-button switch.
DUAL FUNCTION KILL SWITCH - Easily cut power on demand with a built-in manual reset that doubles as a kill switch.
ULTIMATE OVERLOAD PROTECTION - Safeguard your amps & motors from damaging power surges with 300A capacity.
VERSATILE VOLTAGE COMPATIBILITY - Works seamlessly across 12V to 48V DC systems for cars, boats, RVs & more.

The Hamolar 3 Pack 300A Circuit Breaker offers robust overload and short circuit protection for 12V-48V DC systems, ideal for car audio, marine, RV, and ATV applications. Featuring a manual push-button reset that doubles as a kill switch, it eliminates fuse replacements and safeguards your equipment against power surges. Built with high-quality copper washers and wire lugs, it operates reliably across a wide temperature range (-32°C to 82°C), ensuring durable, professional-grade electrical safety.

Specifications

Asin	B095YZN677
Best Sellers Rank	#782,855 in Electronics (See Top 100 in Electronics) #227 in Car & Vehicle Fuse Holders
Brand Name	Hamolar
Circuit Breaker Type	Standard
Current Rating	300 Amps
Customer Reviews	4.4 4.4 out of 5 stars (421) 4.4 out of 5 stars
Item Dimensions D X W X H	43D x 49W x 43H Millimeters
Item Weight	110 Grams
Manufacturer	Hamolar
Model Number	CB5-300A
Mounting Type	Panel Mount
Number Of Poles	1
Part Number	CB5-300A
Upc	721703426408
Voltage	12 Volts, 24 Volts

Reviews

User

Satisfactory

First order got cancelled and refunded, second time delivered before expected date. Product just put into use. Will update usage after 3 months.

8.04.2024

User

Great little breakers with good bang for the buck!

These are great little breakers for the price.One arrived broken but they were shipped via Amazon Prime so it was no fault of the seller.Would definitely recommend these to others.

20.11.2023

User

Awesome

Awesome product for the quality and price

2.10.2025

User

Muy buen producto en cuanto a costo y calidad

Me encanta la calidad y sobre todo su costoLa calidad supera el costo

13.10.2023

User

its everything i needed

bundle and save perfect for my needs

11.06.2026

User

bonne qualité

satisfait

14.01.2023

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

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ƒ302

Duties & taxes included

In stock

Sold byAmazon Sint MaartenDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Sint Maarten.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

View all Trustpilot reviews