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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⚡ Stay powered, stay protected—never miss a beat with the E9 T3 Hi-Amp!

IGNITION PROTECTED SAFETY - Certified safe for gasoline-powered boats, ensuring worry-free installation.
IP 67 WATERPROOF DURABILITY - Built to withstand harsh environments—rain or shine, on land or sea.
TRIP FREE FAULT PROTECTION - Automatically trips under fault conditions—no manual override, no risk.
UNMATCHED 200 A POWER HANDLING - Handles heavy-duty automotive and marine circuits with ease.
VERSATILE 12 V 48 V COMPATIBILITY - Fits a broad range of vehicles and equipment for ultimate flexibility.

The E9 T3 Hi-Amp 200A Circuit Breaker is a robust, ignition-protected, surface-mount switch designed for 12V to 48V DC systems. Featuring a trip-free design and IP67 waterproof housing, it ensures reliable, safe power management in automotive and marine applications. Compact and UL-rated, it’s the ultimate drop-in replacement for demanding 200A circuits.

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Brand	T Tocas
Current Rating	200 Amps
Voltage	48 Volts
Item Dimensions LxWxH	3.39 x 1.89 x 1.44 inches
Circuit Breaker Type	Standard
Mounting Type	Surface Mount
Number Of Poles	1
Manufacturer	T Tocas
Item Weight	3.67 ounces
Product Dimensions	3.39 x 1.89 x 1.44 inches
Country of Origin	China
Item model number	200A
Is Discontinued By Manufacturer	No
Manufacturer Part Number	BBCB594-200A
OEM Part Number	BBCB594
Lift Type	ON-OFF-ON
Amperage	200 Amps

T3 Hi-Amp 200A 3/8" Studs Circuit Breaker with Manual Reset 12V - 48V DC | Waterproof IP67 | UL Certified,Surface Mount, 200 Amp Switchable

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