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 1/4" Studs 50A Amp Circuit Breaker w/Manual Reset 12-72V DC UL

E9 1/4" Studs 50A Amp Circuit Breaker w/Manual Reset 12-72V DC 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 rating

💧IP67 waterproof protection

🔄Manual reset switch

€ 53.24

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

EFFORTLESS MANUAL RESET - Switch button lets you quickly reset without replacing fuses 🔄
VERSATILE VOLTAGE RANGE - Operates seamlessly from 12V up to 72V DC for diverse applications
CERTIFIED SAFETY ASSURANCE - Meets SAE J1625, J1171, and UL1500 ignition protection standards for worry-free use
BUILT TO BRAVE THE ELEMENTS - IP67 waterproof and UL94V0 thermoplastic housing ensures durability in harsh environments 💧
POWER PACKED 50 AMP CAPACITY - Handles heavy-duty marine and automotive loads with ease ⚡

The T Tocas E9 50 Amp Marine Circuit Breaker is a compact, lightweight, and waterproof inline fuse with a manual reset switch, designed for 12V-72V DC systems. Certified for marine and automotive safety standards, it offers reliable battery disconnect functionality and is ideal for boats, RVs, trucks, and solar setups.

Specifications

ASIN	B01F76VJKQ
Best Sellers Rank	#4,490 in Automotive ( See Top 100 in Automotive ) #4 in Automotive Replacement Circuit Breaker Switches
Brand	T Tocas
Brand Name	T Tocas
Circuit Breaker Type	Standard
Current Rating	50 A
Customer Reviews	4.7 out of 5 stars 687 Reviews
Item Dimensions D x W x H	1.5"D x 1.89"W x 2.91"H
Item Highlight	50 Amp Inline Fuse Switchable for Fishing Boat Trolling Motor Car Solar Battery \| Waterproof Surface Mount
Item Weight	104 g
Manufacturer	T Tocas
Model	50 AMP
Mounting Type	Surface Mount
Number Of Poles	1
Number of Items	1
Number of Poles	1
Part Number	BBCB594-50A
Product Dimensions	1.5"D x 1.89"W x 2.91"H
UPC	605996935659
Unit Count	1 Count
Voltage	72 volts
Warranty Description	6 Month Warranty Against Manufacturer Defects

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€ 53.24

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

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The product exactly matches the description. Very satisfied with my purchase.

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