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 | 100 Amp Fuse Switch Button for Automotive Trolling Motor Marine Solar Battery System RV Truck Car Audio ,Surface Mount

Product ID: 35133224

Details

Brand
T Tocas
Circuit Breaker Type
Surface Mount
Current Rating
100 A
Mounting Type
Surface Mount
Product Dimensions
2.91"D x x

⚡100A high current rating

💧IP67 waterproof protection

🔄Manual reset switchable design

$57.01

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Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Stay powered, stay protected — reset your way to uninterrupted adventure!

RESET REUSE CONVENIENCE - Type III manual reset switch lets you avoid costly fuse replacements and downtime with a simple push.
WATERPROOF WEATHERPROOF - IP67-rated housing ensures reliable performance even in the harshest outdoor and marine environments.
CERTIFIED SAFETY ASSURANCE - Meets SAE J1625, J1171, and UL1500 ignition protection standards for peace of mind on the road or water.
COMPACT LIGHTWEIGHT DESIGN - Surface mount with 1/4"-28 threaded studs fits seamlessly into tight spaces without adding bulk.
POWER PACKED 100 AMP CAPACITY - Handles heavy-duty 12V-48V DC circuits with ease, perfect for automotive and marine power needs.

The T Tocas E9 100 Amp Breaker is a compact, lightweight, and UL-certified surface mount circuit breaker designed for 12V-48V DC systems. Featuring a manual reset switch and IP67 waterproof thermoplastic housing, it replaces traditional fuses with a resettable, durable solution ideal for automotive, marine, RV, and battery-powered applications. Certified to rigorous SAE and UL standards, it ensures safe, reliable circuit protection in demanding environments.

Specifications

ASIN	B01F76VJT2
Best Sellers Rank	#5,477 in Automotive ( See Top 100 in Automotive ) #5 in Automotive Replacement Circuit Breaker Switches
Brand Name	T Tocas
Circuit Breaker Type	Surface Mount
Current Rating	100 A
Customer Reviews	4.6 4.6 out of 5 stars (361)
Item Dimensions D x W x H	2.91"D x 1.89"W x 3.66"H
Item Highlight	12V-48VDC 100A Inline Fuse Holder for Automotive Boat Marine Solar Battery System RV Truck Car Audio Surface Mount
Item Weight	3.68 ounces
Manufacturer	T Tocas
Model	100 AMP
Mounting Type	Surface Mount
Number of Items	1
Number of Poles	1
Part Number	BBCB594-100A
UPC	605996935666
Unit Count	1 Count
Voltage	48 volts
Warranty Description	6 Month Warranty Against Manufacturer Defects

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$57.01

Duties & taxes included

In stock

Sold byAmazon British Virgin IslandsDelivered 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 British Virgin Islands.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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