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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50 amp Trolling Motor Circuit Breaker with Manual Reset 12-72V DC | IP67 for RV Marine Boat Car Audio Solar Inline Fuse Block Resettable Disconnect Switch

50 amp Trolling Motor Circuit Breaker with Manual Reset 12-72V DC | IP67 for RV Marine Boat Car Audio Solar Inline Fuse Block Resettable Disconnect Switch

Product ID: 30480822

Details

Brand
T Tocas
Circuit Breaker Type
Standard
Current Rating
50 A
Mounting Type
Surface Mount
Product Dimensions
1.5"D x 1.89"W

⚡50A high current capacity

💧IP67 waterproof rating

🔄Manual reset switch

R941

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

COMPACT YET MIGHTY - Lightweight, surface-mount design fits seamlessly into tight spaces without compromising performance.
BUILT TO BRAVE THE ELEMENTS - IP67 waterproof and UL 94V0 thermoplastic housing ensures durability in the harshest environments.
INSTANT RESET ZERO DOWNTIME - Manual reset switch lets you quickly restore power without replacing fuses—stay in control.
POWER THROUGH WITH CONFIDENCE - Handles 12-72V DC systems effortlessly, perfect for marine, RV, and solar setups.
CERTIFIED SAFETY YOU CAN TRUST - Meets SAE J1625, J1171, and UL1500 ignition protection standards for peace of mind.

The T Tocas 50 amp Trolling Motor Circuit Breaker is a compact, lightweight, and highly durable resettable switch designed for 12-72V DC systems. Featuring IP67 waterproof protection and certified to rigorous automotive and marine safety standards, it offers reliable battery disconnect functionality with a manual reset button. Ideal for marine, RV, solar, and automotive applications, it replaces standard fuses with a safer, reusable solution.

Specifications

ASIN	B01F76VJKQ
Best Sellers Rank	#4,604 in Automotive ( See Top 100 in Automotive ) #4 in Automotive Replacement Circuit Breaker Switches
Brand Name	T Tocas
Circuit Breaker Type	Standard
Current Rating	50 A
Customer Reviews	4.7 4.7 out of 5 stars (684)
Item Dimensions D x W x H	1.5"D x 1.89"W x 2.91"H
Item Weight	104 g
Manufacturer	T Tocas
Model	50 AMP
Mounting Type	Surface Mount
Number of Items	1
Number of Poles	1
Part Number	BBCB594-50A
UPC	605996935659
Unit Count	1 Count
Voltage	48 volts
Warranty Description	6 Month Warranty Against Manufacturer Defects

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