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 100 Amp Breaker w/Manual Reset Switchable Waterproof UL

E9 100 Amp Breaker w/Manual Reset Switchable Waterproof UL

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

¥8198

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

CERTIFIED SAFETY - Meets SAE J1625, J1171, and UL1500 ignition protection standards for peace of mind
EFFORTLESS RESET - Type III manual reset switch lets you quickly restore power without hassle
WEATHERPROOF WARRIOR - IP67-rated waterproof housing ensures durability in any environment
COMPACT LIGHTWEIGHT - Streamlined surface mount design fits seamlessly into tight spaces
POWERHOUSE PROTECTION - Handles up to 100 amps for robust circuit safety

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

Specifications

ASIN	B01F76VJT2
Best Sellers Rank	#3,683 in Automotive ( See Top 100 in Automotive ) #4 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 (362)
Item Dimensions D x W x H	2.91"D x 1.89"W x 3.66"H
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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¥8198

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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