40 amp 3 pole Miniature Circuit Breaker

5 out of 5 based on 2 reviews | Write a review

$73.79

3 pole 40 amp miniature circuit breaker (MCB) for sale at factory price. This mini circuit breaker features a 6kA short-circuit breaking capacity and C curve trip characteristic, ensuring reliable protection against short circuits and overloads.

SKU: ATO-MCB-3P40

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Delivery date: 6-12 days

Overview
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Cost-effective 3P 40 amp miniature circuit breaker is designed for standard rail mounting and is rated for a 230/400V AC supply. This mini MCB features a 6kA short-circuit breaking capacity and C curve trip characteristic, offering reliable short-circuit and overload protection.

3 Pole MCB Breaker Information

Rated Current: 40 amp
Rated Voltage: 230/400V AC, 50Hz
Number of poles: 3 pole
6 kA rated short-circuit breaking capacity
Compliant with IEC standard
C curve trip characteristic
With overload protection and short circuit protection function

Technical Data

Model		ATO-NB8-633PC40
Rated Current		40A
Rated Voltage		230/400V
Frequency		50Hz
Number of Poles		3P
Mechanical Life		20000 Times
Electrical Life		10000 Times
Rated Short-Circuit Breaking Capacity		6000A
Operating Short-Circuit Breaking Capacity		6000A
Rated Impulse Withstand Voltage (1.2/50)		6kV
Dielectric Test Voltage		2000V (50Hz, 1 min)
Heat & Humidity Resistance		28 Cycles
Vibration Resistance		No Obvious Vibration and Impact
Terminal Block	Terminal Block Type	Pillar Terminal Block
	Min. Terminal Size Acceptability	1mm²
	Max. Terminal Size Acceptability	25mm²
	Standard Connection Torque	2 N.m
	Max. Tolerable Torque	2.5 N.m
	Wire Insertion Depth	13mm
Reference Temperature		30℃
Operating Temperature		-35℃~+70℃
Storage Temperature		35℃~+85℃
Applicable Altitude		2000m
Tripping Mode		Thermal Magnetic Trip
Electromagnetic Tripping Type		Type C (5In-10In)
Shell Flame Retardant Grade		V0
Wire Entry Method		Both Upper and Lower
Installation Method		TH35-7.5 Standard Rail
Protection Level	Direct Installation	IP20B
	Installed in the Distribution Box	IP40B

3 Pole MCB Breaker Dimensions (Unit: mm)

40 amp 3 pole Miniature Circuit Breaker Dimensions

Details

3 pole Miniature Circuit Breaker Details

Tips: How to select a miniature circuit breaker

Determine the number of poles of the mini circuit breaker according to the number of lines to be protected. For example, the general household electricity is single-phase electricity, and the circuit consists of a neutral wire and a live wire. If both lines need to be protected, select two poles. If the neutral line does not need to be protected, choose a single pole.
Determine the amperage of the mini circuit breaker according to the line load. For example, if the load capacity of the line is 20A and the rated working current of the electrical appliance is 10A, the MCB selection should be>10A, <20A.
Determine the type of instantaneous protection according to the resistance type of electrical appliances in the loop. There are three types of instantaneous protection, and the corresponding current protection multiples are B: 3~5In, C: 5~10In, and D10~14In (In is the rated current). If it's just an incandescent lamp, you can choose type B. Choose type C for general electricity use, and type D for air conditioning protection.

Types of Circuit Breakers

In this video, we'll take a closer look at the meaning behind these abbreviations and explain the types of circuit breakers they represent. By understanding the different types of circuit breakers on the market, you can make an informed decision and choose the right type for your specific requirements, thereby enhancing the protection of your electrical infrastructure.

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Although isolators and circuit breakers have similar functions in a circuit, they are two separate entities. This video explains you the difference between the two devices in terms of working, features, operation, affordability, etc. You can choose between them based on your specific requirements.

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Existing reviews of 40 amp 3 pole Miniature Circuit Breaker

Great for price.

This 3 pole miniature circuit breaker takes up little space. Works great for interconnecting solar panel junction boxes. It is easy to install and works very well. Good performance and great for the price.

From: Alexander | Date: 28/10/2022

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This miniature circuit breaker is great.

I need a circuit breaker between the charge controller and the battery, so I ordered this miniature circuit breaker. It works great. Well-made and easy to use. I would recommend this MCB, and pricing is fair.

From: Paris | Date: 28/04/2022

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