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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E9 100A Amp Circuit Breaker w/Manual Reset Waterproof 12V-48VDC UL

Product ID: 35133224

Details

Actuator Type
Push Button
Brand
T Tocas
Current Rating
100 A
International Protection Rating
IP67
Item dimensions L x W x H
2.91 x 1.89 x
Material
Best-seller

⚡100A high current capacity

💧IP67 waterproof rating

🔄Manual reset switch

AR$94476

Duties & taxes included

In stock

Sold byAmazon ArgentinaDelivered 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 Argentina.

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Description

⚡ Stay powered, stay protected — never miss a beat with the E9 Circuit Breaker!

EFFORTLESS RESET - Type III manual reset switch for instant, hassle-free recovery
CERTIFIED CONFIDENCE - Meets SAE J1625, J1171 & UL1500 ignition protection standards
WEATHERPROOF WARRIOR - IP67-rated waterproof housing keeps your system safe rain or shine
COMPACT LIGHTWEIGHT - Streamlined surface mount design fits tight spaces without bulk
POWERHOUSE PROTECTION - Handles up to 100 amps for robust circuit safety

The T Tocas E9 100 Amp Circuit Breaker is a compact, lightweight, and UL-certified device designed for 12V-48V DC systems. Featuring a manual reset switch and IP67 waterproof thermoplastic housing, it offers reliable, ignition-protected circuit interruption for marine, automotive, RV, and solar battery applications. Its 1/4"-28 threaded studs and surface mount design ensure easy installation and durable performance, replacing standard fuses with a resettable solution.

Specifications

ASIN	B01F76VJT2
Actuator Type	Push Button
Best Sellers Rank	#6,208 in Automotive ( See Top 100 in Automotive ) #5 in Automotive Replacement Circuit Breaker Switches
Brand Name	T Tocas
Color	Surface Mount
Current Rating	100 A
Customer Reviews	4.6 4.6 out of 5 stars (373)
International Protection Rating	IP67
Item Dimensions	2.91 x 1.89 x 1.44 inches
Item Weight	3.68 ounces
Manufacturer	T Tocas
Material Type	Best-seller
Model	100 AMP
Mounting Type	Surface Mount
Number of Items	1
Number of Positions	1
Operating Voltage	48 volts_of_direct_current
Part Number	BBCB594-100A
Specification Met	UL
Switch Type	Manual Switch
UPC	605996935666
Unit Count	1 Count
Upper Temperature Rating	180 °F
Warranty Description	6 Month Warranty Against Manufacturer Defects

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

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

1 day ago

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Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

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AR$94476

Duties & taxes included

In stock

Sold byAmazon ArgentinaDelivered 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 Argentina.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Rajesh P.

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

2 days ago

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