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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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

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 max current capacity

💧IP67 waterproof rating

🔧Surface mount with stud insulators

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¥8748

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Stay powered, stay protected — the breaker that never quits!

TRIP FREE DESIGN - Automatically trips on fault current, preventing manual override for ultimate safety
VERSATILE SURFACE MOUNT - Includes protective stud insulators and dual stud orientations for flexible installation
IGNITION PROTECTED SAFETY - Certified safe for gasoline-powered vehicles and marine applications
IP 67 WATERPROOF PROTECTION - Built to withstand harsh environments, perfect for boats and outdoor setups
UNMATCHED 200 A POWER HANDLING - Handles heavy-duty automotive and marine circuits with ease

The T Tocas E9 3/8" Studs 200 Amp Circuit Breaker is a robust, ignition-protected, and IP67 waterproof switch designed for 12V to 48V DC automotive and marine applications. Featuring a trip-free design and surface mount installation with protective stud insulators, it ensures reliable high-amp circuit protection and easy manual reset, making it a top choice for professionals demanding durability and safety.

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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