MT 6300A Draw-Out Air Circuit Breaker for High-Current Power Distribution

Description: Product Overview

The MT Series Draw-Out Air Circuit Breaker is designed for low-voltage main distribution systems that require high current capacity, operational flexibility, and reliable protection performance. With a withdrawable structure, the breaker can be safely inserted, withdrawn, or isolated without disconnecting the main wiring, making inspection and maintenance more efficient.

Covering a rated current range from 2000A to 3200A, this series is suitable for use as a main incoming breaker or heavy-duty feeder breaker in industrial and commercial power systems. Its air arc-extinguishing design enables stable interruption performance under overload and short-circuit conditions, helping maintain system continuity and equipment safety.

The MT Series complies with relevant low-voltage circuit breaker standards, including IEC 60947-2 and GB 14048.2, making it suitable for integration into standardized switchgear assemblies and power distribution cabinets.Widely used in photovoltaic power generation, new energy industrial and mining enterprises, AI data centers, power plants, aluminum production plants.

Applications:

Draw-out air circuit breakers in the MT Series are widely used in low-voltage power distribution systems where high current ratings and operational reliability are required. Typical applications include:

Industrial manufacturing plants

Commercial and mixed-use buildings

Data centers and critical facilities

Hospitals and public infrastructure

Power distribution panels and switchgear systems

Their withdrawable design makes them especially suitable for installations that require routine maintenance, system upgrades, or reduced downtime.

Working Principle

When the product is in the closed and powered on state, if there is overload or short circuit, undervoltage or phase loss in the circuit, the current transformer in the ACB will detect the current signal, which will be transmitted to the controller. The controller will then send a command to the mechanism to trip, causing the dynamic and static contacts to separate and disconnect, and the product will open, achieving the function of protecting the backend load.

ACB1.mp4
ACB installation.mp4
ACB installation and test1.mp4

Product Accessories

Product Quality:

The moving and stationary contacts are made of copper, while the moving and stationary points are made of silver alloy, offering advantages such as high-temperature resistance, oxidation resistance, and excellent conductivity. The number of our contacts is 17.

		The material and outgoing copper busbars are made of thick standard-grade pure copper material

The drawer base adopts the standard thickness of copper busbar, and the clamp that interlocks the drawer base with the circuit breaker body is a copper clamp.

The controller adopts the technology of SunTech and Kefeng, and the circuit board undergoes a 24-hour aging test.

The undervoltage release coil is sourced from Jiangsu Guoxing, with the coil winding count meeting the standard.

Management Quality:

Material Inspection (Contact Spring Pressure, Detection of Contact Points and Copper Busbar Defects, Cold Soldering)

		Batch trial assembly qualification range (travel, clearance, contact pressure, tripping force)

Semifinished Product Inspection (Excess Distance Opening Circuit Resistance, Three-Phase Synchronous Closing Full Inspection, Mechanical Reset Operation 15 Times Full Inspection, Mechanism is Whether there is false closing, the above-mentioned other factories may not perform these tests (instantaneous, delayed, short-circuit debugging)

		Finished Product Inspection (5 operations of closing and opening, energy storage, undervoltage tripping, and power-on tests for incoming and outgoing lines in the closed state)

Packaging Inspection (Check appearance, verify parameters)

1. Various models, specifications, and sizes can be customized. Our production current ranges from 400A to 7500A and can be customized.

2. Genuine source factories with high cost-effectiveness

Equipped with professional debugging equipment and inspection personnel, each product is fully tested with a 2-year warranty. The company has over ten years of production experience, not only producing circuit breakers, but also complete sets of switchgear and using circuit breakers. Various problems encountered in product application have been experienced, and many problems can be avoided. There are professional senior engineers, and the boss has a technical background at Chint. They are professional engineers

Product debugging.mp4
Product debugging1.mp4
Product debugging2.mp4
ACB Closing/Opening - Energy Storage - Overload - Short Circuit - Undervoltage Testing
ACB Closing/Opening - Energy Storage - Overload - Short Circuit - Undervoltage Testing
ACB Closing/Opening - Energy Storage - Overload - Short Circuit - Undervoltage Testing
ACB Closing/Opening - Energy Storage - Overload - Short Circuit - Undervoltage Testing
ACB Closing/Opening - Energy Storage - Overload - Short Circuit - Undervoltage Testing

To ensure transportation safety, our electrical products are exported in reinforced wooden crates. The crates undergo heat treatment and bear the ISPM-15 mark, enabling swift customs clearance. The raised base design facilitates forklift operation, while internal shock-absorbing fastening ensures the products arrive intact. All exterior crates are clearly labeled and comply with international logistics standards.

sp.1.mp4
Photovoltaic Grid-Connected Cabinet Utilising ACB and MCCB
Power transmission successful
Box-typesubstation ACB VCB MCCB
Box-typesubstation ACB VCB MCCB
Box-typesubstation ACB VCB MCCB
Application Scenario Footage
Power transmission successful
Power transmission successful
Photovoltaic Grid-Connected Cabinet Utilising ACB and MCCB
Photovoltaic Grid-Connected Cabinet Utilising ACB and MCCB
Box-typesubstation ACB VCB MCCB

Model			MTW1-2000	MTW1-3200	MTW1-4000	MTW1-6300	MTW1-7500
Shell current	Inm(A)		2000	3200	4000	6300	7500
Number of poles	-		3P / 4P	3P / 4P	3P / 4P	3P / 4P	3P / 4P
Rated working voltage	Ue(v)		AC400/690	AC400/690	AC400/690	AC400/690	AC400/690
Rated current	In(A)		4.00601E+24	2.00025E+15	3.20036E+11	4.0005E+11	7500
Rated insulation voltage	Ui(v)		800	1000	1000	1000	1000
Rated impulse withstand voltage	Uimp(kv)		8	12	12	12	12
Controller model	-		L, M, H	L, M, H	L, M, H	L, M, H	L, M, H
Operating frequency	(Hz)		50	50	50	50	50
Rated limit short-circuit breaking capacity	Icu kA (o-co)	400V	65	100	100	120	120
Rated limit short-circuit breaking capacity	Icu kA (o-co)	690V	50	65	75	85	85
Rated running short-circuit breaking capacity	Ics kA (o-co-co)	400V	40	65	80	100	100
Rated running short-circuit breaking capacity	Ics kA (o-co-co)	690V	40	50	65	75	75
Rated short time withstand current	IcwkA(1s) Time delay 0.4s o-co		50	65	65	85	85
Rated short time withstand current	IcwkA(1s) Time delay 0.4s o-co		50	65	65	85	85
Power loss	(In) W	Fixed	40,60,90,140,170	170,260,320,420	430,440,450	1.22513E+11	1.22513E+11
Power loss	(In) W	Drawer	80,130,205,310	400,510,650,760	780,790,800	1.22513E+11	1.22513E+11
Standard	-		GB-TGB14048.2/IEC60947-2	GB-TGB14048.2/IEC60947-2	GB-TGB14048.2/IEC60947-2	GB-TGB14048.2/IEC60947-2	GB-TGB14048.2/IEC60947-2
Installation Method	-		Fixed Type (3/4)	Fixed Type (3/4)	Fixed Type (3/4)	Fixed Type (3/4)	Fixed Type (3/4)
Installation Method			Drawer Type (3/4)	Drawer Type (3/4)	Drawer Type (3/4)	Drawer Type (3/4)	Drawer Type (3/4)

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Drawer Type Air Circuit Breakers

MT 6300A Draw-Out Air Circuit Breaker for High-Current Power Distribution