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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100 Amp Circuit Breaker with Manual Reset, Ignition Protected, 12V- 48V DC, Water Resistant (100A)

Product ID: 674200416

Details

Brand
T Tocas
Circuit Breaker Type
Standard
Current Rating
100 Amps
Mounting Type
Surface Mount
Product Dimensions
74D x 48W x

⚡100A high current capacity

💧IP67 water & dust resistant

🔄Manual reset for instant control

EC$263

Duties & taxes included

In stock

Sold byAmazon Saint Vincent and the GrenadinesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Saint Vincent and the Grenadines.

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Description

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

EFFORTLESS RESET - Manual reset switch lets you regain control instantly without hassle.
COMPACT LIGHTWEIGHT - Sleek surface mount design with durable thermalplastic housing fits seamlessly in tight spaces.
POWERHOUSE PROTECTION - Handles up to 100 Amps with a 3000A interrupt capacity for ultimate safety.
BUILT TO BRAVE ELEMENTS - IP67-rated water and dust resistance ensures reliable performance in harsh environments.
IGNITION PROTECTED CERTIFIED - Meets SAE J1625, J1171, UL1500 standards for marine and automotive peace of mind.

The T Tocas 100 Amp Circuit Breaker is a compact, surface-mount device designed for 12V-48V DC systems. It features a manual reset switch, IP67 water and dust resistance, and meets rigorous ignition protection standards (SAE J1625, J1171, UL1500). With a 3000A interrupt capacity and durable thermalplastic housing, it’s ideal for marine, RV, solar, and automotive applications requiring reliable, high-capacity circuit protection.

Specifications

ASIN	B01F76VJT2
Best Sellers Rank	#272,951 in Home Improvement ( See Top 100 in Home Improvement ) #1,391 in Circuit Breakers
Brand Name	T Tocas
Circuit Breaker Type	Standard
Current Rating	100 Amps
Customer Reviews	4.6 4.6 out of 5 stars (358)
EU Spare Part Availability Duration	1 Years
Item Dimensions D x W x H	74D x 48W x 24H Millimeters
Item Weight	0.23 Pounds
Manufacturer	T Tocas
Model Number	100 AMP
Mounting Type	Surface Mount
Number of Items	1
Number of Poles	1
Part Number	BBCB594-100A
UPC	605996935666
Unit Count	1.0 Count
Voltage	48 Volts

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TrustScore 4.5 | 7,300+ reviews

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EC$263

Duties & taxes included

In stock

Sold byAmazon Saint Vincent and the GrenadinesDelivered 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 Saint Vincent and the Grenadines.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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