Why does it have a neg and positive marking.. .usually you just interrupt the positive in this case with single pole?

Yes, usually you just interrupt the positive with single pole. DC is directional, so by marking positive and negative poles, and wiring according to the markings, you will clear that the DC direction is from circuit breaker bottom to top, which is easy to maintain.

What end top or bottom does the load connect to on a single pole breaker ? The breaker has a plus sign and a minus sign that is useless.

The load is generally connect on the top of the circuit breaker, DC direction is from the bottom of the circuit breaker to the top.

what wire size is accepted?

a wire size that is rated at 100amp.

Do you connect the battery to the top or bottom ?

There are polarity markings on the body of the switch. I connected the dc power lines accordingly.

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12V-110V DC Miniature Circuit Breaker, 125 Amp 1 Pole

12V-110V DC Miniature Circuit Breaker, 125 Amp 1 Pole

Product ID: 449390502

Details

Brand
CHTAIXI
Circuit Breaker Type
Standard
Current Rating
125 A
Mounting Type
DIN Rail Mount
Number Of Poles
1

⚡125A high current rating

🔥Magnetic arc extinguishing system

🔧35mm DIN rail mount for easy install

€ 30.32

Duties & taxes included

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Break free from power worries with CHTAIXI’s 125A DC circuit breaker!

DURABLE DESIGN - Silver alloy contacts and flame-retardant shell deliver long-lasting reliability and peace of mind.
ARC DEFYING TECH - Advanced magnetic arc extinguishing system minimizes fire risk and boosts safety under high DC loads.
SNAP IN SIMPLICITY - Effortless 35mm DIN rail mounting ensures quick, secure installation—no fuss, no downtime.
POWERHOUSE PROTECTION - Safeguards your solar, RV, and battery systems from overloads and short circuits with a robust 125A rating.
VERSATILE COMPATIBILITY - Perfectly engineered for solar PV, electric mopeds, RVs, and all your DC power setups.

The CHTAIXI 12V-110V DC Miniature Circuit Breaker is a 125 Amp, single-pole device designed for high-current DC systems like solar PV and RVs. Featuring a magnetic arc extinguishing system, silver alloy contacts, and a flame-retardant shell, it mounts easily on a 35mm DIN rail and provides reliable overload and short-circuit protection for your critical power distribution.

Specifications

ASIN	B0B1WC651R
Best Sellers Rank	#81,163 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #56 in Miniature Circuit Breakers
Brand Name	CHTAIXI
Circuit Breaker Type	Standard
Current Rating	125 A
Customer Reviews	4.4 4.4 out of 5 stars (52)
Item Highlight	Battery Breaker for Solar PV System and RV, Thermal Magnetic Trip, DIN Rail Mount, High Current DC Disconnect Switch 1P B125
Manufacturer	CHTAIXI
Model	1 Pole
Mounting Type	DIN Rail Mount
Number of Items	1
Number of Packs	1
Number of Poles	1
Part Number	47NZ125-B
Unit Count	1 Count
Voltage	12 volts

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TrustScore 4.5 | 7,300+ reviews

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The delivery time was excellent, and the packaging was secure.

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