It seems to be a polarized breaker, will it work properly to charge and discharge the batteries through it? I.e. current reverses during the charge.

Wrong! there is a stamp in molding by poles which indicates which side is battery (batt) and Auxiliary aux. Battery side is on top in most cases.

150A or 200A manual reset circuit breaker will be ok between battery bank and 3k inverter, using 2/0 wire? Or should I fuse instead.?

Remember 2/0 Copper Wire is rated up to 170 Amps. Installing a 200A breaker risks the chance of the wire overheating and causing a fire.

Would this 40amp be suitable for connecting my new 4000w generator to the main switchboard?

No! This is a DC rated breaker if your generator makes AC power which I suspect it does you need a traditional AC breaker.

why there is more than 10% voltage drop in the Circuit Breaker ?

If you're measuring 10% voltage drop across this breaker you have something wrong going on. High resistance within the Breaker.

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E9 50 Amp Marine Circuit Breaker Switchable 12V-72V UL

Product ID: 30480822

Details

Brand
T Tocas
Circuit Breaker Type
Standard
Current Rating
50 A
Mounting Type
Surface Mount
Product Dimensions
1.5"D x 1.89"W

⚡50A high current capacity

💧IP67 waterproof rating

🔄Manual reset switch

€ 51.34

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Sold byAmazon GreeceDelivered 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 Greece.

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Description

⚡ Stay powered, stay protected — the ultimate marine circuit breaker for pros on the move!

CERTIFIED SAFETY - Meets SAE J1625, J1171, and UL1500 standards for ignition-protected, worry-free use
EFFORTLESS RESET - Type III manual reset switch lets you quickly restore power without replacing fuses
WEATHERPROOF WARRIOR - IP67-rated waterproof housing ensures reliable performance in harsh environments
POWERHOUSE PROTECTION - Handles up to 50 amps for robust marine and automotive power needs
VERSATILE VOLTAGE RANGE - Operates seamlessly from 12V to 72V DC, perfect for diverse applications

The T Tocas E9 50 Amp Marine Circuit Breaker is a compact, lightweight, and UL-certified inline fuse with a manual reset switch. Designed for 12V-72V DC systems, it offers IP67 waterproof protection and meets rigorous automotive and marine safety standards. Ideal for boats, RVs, solar setups, and more, it replaces standard fuses with a durable, resettable solution that keeps your power systems safe and reliable.

Specifications

ASIN	B01F76VJKQ
Best Sellers Rank	#3,444 in Automotive ( See Top 100 in Automotive ) #4 in Automotive Replacement Circuit Breaker Switches
Brand Name	T Tocas
Circuit Breaker Type	Standard
Current Rating	50 A
Customer Reviews	4.7 4.7 out of 5 stars (685)
Item Dimensions D x W x H	1.5"D x 1.89"W x 2.91"H
Item Weight	104 g
Manufacturer	T Tocas
Model	50 AMP
Mounting Type	Surface Mount
Number of Items	1
Number of Poles	1
Part Number	BBCB594-50A
UPC	605996935659
Unit Count	1 Count
Voltage	48 volts
Warranty Description	6 Month Warranty Against Manufacturer Defects

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TrustScore 4.5 | 7,300+ reviews

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€ 51.34

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered 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 Greece.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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

3 days ago

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