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

Product ID: 674200416

Details

Brand
T Tocas
Current Rating
100 Amps
Operating Voltage
48 Volts (DC)
Operation Mode
Manual
Switch Type
Manual Switch

⚡100A high current capacity

💧IP67 water & dust resistant

🔄Manual reset for instant control

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	#283,648 in Home Improvement ( See Top 100 in Home Improvement ) #1,407 in Circuit Breakers
Brand Name	T Tocas
Colour	Surface-Mount
Current Rating	100 Amps
Customer Reviews	4.6 4.6 out of 5 stars (362)
EU Spare Part Availability Duration	1 Years
International Protection Rating	IP67
Item Dimensions	7.4 x 4.8 x 3.7 Centimeters
Item Weight	104 g
Manufacturer	T Tocas
Material Type	Housing is thermalplastic UL rated 94V0
Model Number	100 AMP
Mounting Type	Surface Mount
Number of Items	1
Number of Positions	1
Operating Voltage	48 Volts (DC)
Operation Mode	Manual
Part Number	BBCB594-100A
Specification Met	UL
Switch Type	Manual Switch
UPC	605996935666
Unit Count	1.0 Count
Upper Temperature Rating	84 Degrees Celsius

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