Beginner Question: I have four 100 watt panels going to a 30 Amp MPPT type controller, any suggestions as to which of these is the correct size amps?

Short answer is probably the 400v 30 amp breaker to match your mppt controller. Long answer is it can depend on how your solar panels are wired, in series or parallel. In series the voltages add up (most 100w are around 20v or less) and the amps stay the same. In parallel it’s the opposite. Since your four panels is under the amp and voltage limits whichever way they are connected and the mppt charge controller maxes out at 30 amps, the 400v 30A breaker will work just fine.

Hi i just recieved this item, what is the internal thickness of the copper wire in mm? or equivalent gauge in awg?

This disconnect is rated at "30 Amps", which requires the wire to be 10awg to carry that amount of current. Wire size: 10 Gauge / 2.588 mm

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30 Amp 12V-400V DC Disconnect Switch | IP65 Distribution Box Miniature Circuit Breaker for Solar Panels | DC AC 110V 240V Plug and Play MCB

30 Amp 12V-400V DC Disconnect Switch | IP65 Distribution Box Miniature Circuit Breaker for Solar Panels | DC AC 110V 240V Plug and Play MCB

Product ID: 711232251

Details

Brand
DIHOOL
Circuit breaker type
Standard
Current rating
30 Amps
Mounting type
Plug-In Mount
Number of poles
2

⚡30A high current capacity

💧IP65 waterproof & dustproof

🔌Plug & play MC4 solar connectors

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NT$4770

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Sold byAmazon TaiwanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Stay powered, stay protected — the ultimate switch for your solar setup!

ALL WEATHER IP 65 RATED - Waterproof and dustproof for reliable outdoor use
BUILT TO LAST PROTECT - Thermal overload, short circuit protection with 10,000 mechanical cycles
PLUG PLAY SOLAR READY - MC4 connectors for fast, safe installation without hassle
DUAL VOLTAGE FLEXIBILITY - Supports DC 12-400V and AC 90-400V for versatile applications
POWER PACKED 30 AMP CAPACITY - Handles up to 30A for robust solar and AC/DC protection

The DIHOOL DZ47X 30A DC Disconnect Switch is a rugged, IP65-rated miniature circuit breaker designed for solar panels, EVs, and UPS systems. It supports a wide voltage range (DC 12-400V, AC 90-400V), features plug-and-play MC4 connectors for quick installation, and offers reliable thermal and short circuit protection with a long mechanical lifespan, making it an essential upgrade for any professional solar or electrical setup.

Specifications

ASIN	B0B2LGDRNN
Best Sellers Rank	#196,634 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #372 in Miniature Circuit Breakers
Brand Name	DIHOOL
Circuit Breaker Type	Standard
Current Rating	30 Amps
Customer Reviews	4.6 4.6 out of 5 stars (292)
Included Components	2 Terminals
Manufacturer	DIHOOL
Model	DZ47X-30A-IP65-MC4
Mounting Type	Plug-In Mount
Number of Poles	2
Part Number	DZ47X-30A-IP65-MC4
Voltage	400 Volts

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