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 200A Amp Circuit Breaker with Manual Reset 12V - 48V DC | 3/8" Studs, Switchable ,for Automotive RV Marine ATV Vehicles Audio Solar Battery System| UL Certified Waterproof

Product ID: 41551415

Details

Brand
T Tocas
Circuit Breaker Type
Standard
Current Rating
200 Amps
Mounting Type
Surface Mount
Product Dimensions
3.39"D x x

⚡200A high capacity

💧IP67 waterproof rating

🔋12V-48V wide voltage range

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€ 55.43

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Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Stay powered, stay protected — the breaker your ride deserves!

VOLTAGE VERSATILITY - Seamlessly operates across 12V to 48V DC systems, perfect for diverse vehicle and solar setups.
POWERHOUSE PROTECTION - 200 Amp manual reset breaker engineered for ultimate overcurrent defense.
CERTIFIED SAFETY ASSURANCE - Meets UL1500, SAE J1625 & J1171 ignition protection standards for professional-grade peace of mind.
BUILT TO BRAVE THE ELEMENTS - IP67 waterproof housing and thermoplastic UL94V0 rated for rugged, all-weather reliability.
EFFORTLESS INSTALLATION DURABILITY - Heavy-duty 3/8" stainless steel studs with protective insulators ensure secure, long-lasting connections.

The E9 200A Amp Circuit Breaker is a UL-certified, manual reset device designed for automotive, marine, RV, ATV, and solar battery systems. It supports a wide voltage range from 12V to 48V DC with a high interrupt capacity, features durable stainless steel studs, and boasts an IP67 waterproof rating for reliable performance in harsh environments.

Specifications

ASIN	B06Y4172LP
Best Sellers Rank	#3,680 in Automotive ( See Top 100 in Automotive ) #4 in Automotive Replacement Circuit Breaker Switches #41 in Circuit Breakers
Brand Name	T Tocas
Circuit Breaker Type	Standard
Current Rating	200 Amps
Customer Reviews	4.7 4.7 out of 5 stars (360)
Item Dimensions D x W x H	3.39"D x 1.89"W x 1.44"H
Item Weight	104 Grams
Manufacturer	T Tocas
Model	200A
Mounting Type	Surface Mount
Number of Poles	1
Part Number	BBCB594-200A
Smart Home Compatibility	Not Smart Home Compatible
Unit Count	1 Count
Voltage	48 Volts
Warranty Description	6 Month Warranty Against Manufacturer Defects

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