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 Marine Circuit Breaker w/Manual Reset 3/8"-16 Studs UL

Product ID: 41551415

Details

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

⚡200A heavy-duty current rating

💧IP67 waterproof for rugged use

🔄Manual reset switch for instant reuse

R$474

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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Description

⚡ Reset. Protect. Dominate your power game.

RESET GO - Innovative manual reset switch eliminates fuse replacements—flip to restore power instantly and keep moving.
CERTIFIED CONFIDENCE - Meets SAE, J1171, and UL1500 ignition protection standards—trusted safety for automotive, marine, RV, and off-road gear.
WEATHERPROOF WARRIOR - IP67-rated waterproof shell ensures flawless performance from -32°C to 82°C, perfect for outdoor and engine bay environments.
POWERHOUSE PROTECTION - Handles up to 200 Amps with 2,500A surge capacity—built for your toughest electrical demands.
UNIVERSAL COMPATIBILITY - Fits all 12V to 48V DC systems with secure 3/8"-16 threaded studs and protective cover for stable mounting.

The T Tocas E9 200A Circuit Breaker is a rugged, UL-certified heavy-duty breaker designed for 12V to 48V DC systems. Featuring a manual reset switch, IP67 waterproof rating, and compliance with SAE and UL ignition protection standards, it delivers reliable overload protection for automotive, marine, RV, and off-road applications. Its durable construction and easy surface mount with 3/8" studs make it a top choice for professionals demanding safety and convenience.

Specifications

ASIN	B06Y4172LP
Best Sellers Rank	#5,044 in Automotive ( See Top 100 in Automotive ) #5 in Automotive Replacement Circuit Breaker Switches
Brand Name	T Tocas
Circuit Breaker Type	Standard
Current Rating	200 A
Customer Reviews	4.7 4.7 out of 5 stars (373)
Item Dimensions D x W x H	3.39"D x 1.89"W x 1.44"H
Item Highlight	200 Amp Fuse for Automotive RV Marine ATV Vehicles Car Audio Solar Battery System 12V - 48V Waterproof
Item Weight	104 g
Manufacturer	T Tocas
Model	200A
Mounting Type	Surface Mount
Number of Items	1
Number of Poles	1
Part Number	BBCB594-200A
Unit Count	1 Count
Voltage	48 volts
Warranty Description	6 Month Warranty Against Manufacturer Defects

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R$474

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered 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 Brazil.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Smooth transaction and product arrived in perfect condition.

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