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 Circuit Breaker with Manual Reset, 12V- 48V DC, Waterproof (50A)

50 Amp Circuit Breaker with Manual Reset, 12V- 48V DC, Waterproof (50A)

Product ID: 57713787

Details

Brand
T Tocas
Circuit breaker type
Standard
Current rating
50 Amps
Mounting type
Surface Mount
Product dimensions
36D x 48W x

⚡50 Amp high-capacity current

💧Waterproof for rugged environments

🔄Manual reset for instant control

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9177 kr

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Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Stay powered, stay protected — reset your energy game!

CERTIFIED SAFETY - Meets UL1500 ignition protection and SAE standards for peace of mind
COMPACT LIGHTWEIGHT - Space-saving 7.39 x 4.8 x 3.66 cm form factor fits anywhere
INSTANT RESET CONTROL - Manual reset switch keeps you in command without hassle
POWERHOUSE PROTECTION - Handles up to 50A for heavy-duty DC circuits
BUILT TO BRAVE ELEMENTS - Waterproof design ensures reliable performance in marine and outdoor settings

This 50 Amp waterproof circuit breaker with manual reset supports 12V-48V DC systems, featuring a compact, lightweight thermalplastic housing rated UL 94V0. Designed for marine, RV, solar, and heavy vehicle applications, it meets rigorous SAE and UL ignition protection standards, ensuring reliable, safe power management in demanding environments.

Specifications

ASIN	B01F76VJKQ
Best Sellers Rank	361,862 in DIY & Tools ( See Top 100 in DIY & Tools ) 733 in Circuit Breakers
Brand	T Tocas
Circuit Breaker Type	Standard
Current Rating	50 Amps
Customer Reviews	4.7 4.7 out of 5 stars (659)
Item Dimensions D x W x H	36D x 48W x 74H millimetres
Item Weight	104 Grams
Manufacturer	T Tocas
Manufacturer Part Number	BBCB594-50A
Model Number	50 AMP
Mounting Type	Surface Mount
Number of Poles	1
Product Warranty	6 Month Warranty Against Manufacturer Defects
Smart Home Compatibility	Not Smart Home Compatible
UPC	605996935659
Unit Count	1.0 count
Voltage	48 Volts

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TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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

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9177 kr

Duties & taxes included

In stock

Sold byAmazon IcelandDelivered 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 Iceland.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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