Explosion-proof Motor 4kW 5.5Hp

The Explosion-Proof Motor 4kW 5.5Hp is an ideal choice for industrial applications requiring high safety and the ability to operate in harsh environments. In particular, this explosion-proof motor stands out for its robust design and optimal protection features, helping prevent explosion incidents during operation. Let’s explore the details of this product with Thanh Thai Motor and find out why it is a reliable choice for every business.

Overview design of the 4kW 5.5Hp explosion-proof motor

The 4kW 5.5Hp explosion-proof motor belongs to the explosion-proof motor segment above 3.7kW, designed with a thick cast iron housing to protect the internal structure of the motor from strong external impacts. The sturdy cast iron housing helps protect the electric motor from impacts and enhances durability in high-temperature environments.

In addition, this motor is equipped with larger wiring to maintain stable operation under harsh working conditions. Notably, the explosion-proof feature of the motor helps prevent fire and explosion incidents in the event of electrical faults, fully meeting safety requirements in potentially explosive working environments.

Internal structure of the 4kW 5.5Hp explosion-proof motor

To maintain continuous operating performance at 4kW and ensure absolute safety in chemical or gas environments, all internal components of the motor must achieve explosion-proof certification.

• Stator: The stationary magnetic field block is pressed from technical steel sheets with low core losses. The pure copper winding is coated with a thick insulation layer and treated with multi-layer vacuum varnish conforming to Class F standards to withstand high temperatures and completely prevent electrical discharge.
• Rotor: The robust solid-cast squirrel-cage rotating core features an extremely smooth surface machining and computerized dynamic balancing to completely eliminate mechanical friction that causes sparks inside the machine chamber.
• Bearings: Assembled with heavy-duty bearings from leading global brands. The bearing system integrates multi-layer sealing lips and uses non-flammable lubricating grease to prevent dust and gas from entering the shaft core.
• Cooling system: The centrifugal cooling fan must be made of anti-static plastic or specialized aluminum alloy material to avoid generating static sparks when rubbing against the air.

What are the types of 4kW 5.5Hp explosion-proof electric motors?

The 4kW 5.5Hp explosion-proof motor product line is manufactured with 4 different speed segments, helping engineers easily match the drive characteristics of each industrial machine. Below are the standard specifications for each type:

4kW 5.5Hp Explosion-Proof Motor 2 Poles (2,800 – 3,000 RPM)

This series focuses on high speed, suitable for equipment requiring high flow rates in a short time.

Technical specifications:

Model	112M
Shaft diameter	28mm
Keyway	8mm
Flange diameter	250mm
Weight	35kg
Dimensions	400 x 240 x 300 mm
Mounting type	Foot mounted (B3), Flanged (B35, B5, B14)
Protection class	IP55
Insulation class	Class F

Practical applications:

• Operating centrifugal air compressors in industrial gas production lines to ensure stable transfer flow rates.
• Supporting centrifugal pumps operating in explosive filling stations without generating high heat.
• Participating in booster ventilation systems to circulate air quickly in mines to clear out toxic gases instantly.

4kW 5.5Hp Explosion-Proof Motor 4 Poles (1,400 – 1,500 RPM)

This is the standard rotational speed, offering optimal balance between torque and mechanical durability for heavy-duty equipment.

Technical specifications:

Model	112M
Shaft diameter	28mm
Keyway	8mm
Flange diameter	250mm
Weight	35kg
Dimensions	400 x 240 x 300 mm
Mounting type	Foot mounted (B3), Flanged (B35, B5, B14)
Protection class	IP55
Insulation class	Class F

Practical applications:

• Driving conveyor belts to continuously transport mineral ores in underground mines without worrying about electrical short circuits.
• Used for screw air compressors in environments with high concentrations of chemical vapors requiring absolute explosion safety.
• Operating medium-scale industrial mixing machines in manufacturing workshops to maintain stable mixing force throughout the work shift.

4kW 5.5Hp Explosion-Proof Motor 6 Poles (900 – 1,000 RPM)

This series is designed to generate extremely strong torque, serving equipment with heavy loads and high inertia.

Technical specifications:

Model	132M
Shaft diameter	38mm
Keyway	10mm
Flange diameter	300mm
Weight	52kg
Dimensions	510 x 275 x 345 mm
Mounting type	Foot mounted (B3), Flanged (B35, B5, B14)
Protection class	IP55
Insulation class	Class F

Practical applications:

• Ore crushers operating with heavy loads in explosive coal dust environments.
• Heavy-duty chain conveyors transporting raw ores from the mining area to the collection yard.
• Bucket elevators lifting raw materials at industrial chemical material mixing stations.
• Large-volume raw material mixers operating continuously in areas with high explosive dust concentrations.

4kW 5.5Hp Explosion-Proof Motor 8 Poles (700 – 750 RPM)

The slowest speed, providing the highest starting torque, optimized for movements requiring precision and strong thrust.

Technical specifications:

Model	160M
Shaft diameter	42mm
Keyway	12mm
Flange diameter	350mm
Weight	75kg
Dimensions	615 x 330 x 420 mm
Mounting type	Foot mounted (B3), Flanged (B35, B5, B14)
Protection class	IP55
Insulation class	Class F

Practical applications:

• Cargo winch systems at mining ports helping move heavy-load supplies with well-controlled speed.
• Hoisting mechanisms in ordnance or explosive material warehouses requiring high safety and deliberate slowness in every operation.
• Material calcining rotary kilns in industrial gas environments helping materials bake evenly thanks to slow rotation speed and strong pulling force.

Which gearbox does the 4kW 5.5Hp explosion-proof motor combine with?

Pairing the 4kW explosion-proof motor with transmission equipment requires extremely strict safety factor calculations to ensure that the gearbox does not break under the pulling force of the 5.5Hp motor.

• Helical heavy-duty gearbox: This is the standard option. Large gearbox models such as R47, R57 or K47, K57 fully immersed in oil are often used to drive mine conveyor systems.
• Hollow shaft worm gearbox: Can be coupled with vertical worm gearboxes such as WPA, WPS size 80 or 100 used in fairly high-capacity mixing tanks.
• Drive coupling: It is mandatory to use explosion-proof standard hydraulic couplings or steel disc couplings for smooth starting, eliminating mechanical shock loads, and preventing friction-induced sparks.

Instructions for wiring the explosion-proof motor

Follow these 5 steps to ensure safety and technical correctness:

Step 1: Preparation and inspection

Disconnect the power supply first. Watch the electric motor video and read the specifications on the nameplate to determine the voltage level, thereby selecting the appropriate wire cross-section.

Step 2: Open the terminal box cover

Use a wrench to remove the bolts to lift the box cover (marked with “EX”) off. Be sure to keep the explosion-proof rubber gasket at the edge of the box intact.

Step 3: Identify connection points

Locate the 3 copper terminals marked U, V, W. Check whether the copper bridge links are installed according to the correct star or delta diagram corresponding to the voltage.

Step 4: Connect power and grounding wires

Crimp cable lugs onto the power wires and connect them to terminals U, V, W. It is mandatory to tighten the screws firmly to prevent electrical arcing, and remember to connect the grounding wire as well.

Step 5: Close the cover and finish

Reinstall the cover tightly with the rubber gasket, tightening the screws evenly. To view diagrams of other industrial motor lines, look for the compilation videos produced by Thanh Thai Motor.

Warranty, shipping and commitment policy at Thanh Thai Motor

Warranty up to 24 months

All electric motor products distributed by Thanh Thai Motor are covered by a genuine warranty for up to 24 months. Customers who purchase electric motors can completely rest assured with a transparent, fast, and professional after-sales policy.

Nationwide Shipping

Thanh Thai Motor supports nationwide shipping for all electric motors sold, ensuring safe and on-time delivery to every province across the country. Whether you are in the North, Central, or South, we are ready to serve you.

European Standard Quality – German Technology

Thanh Thai Motor sells electric motors manufactured with German technology, meeting European quality standards, ensuring durability, high efficiency, and stable operation for a long period – suitable for the strict requirements of industrial electric motors.

Competitive Prices – Attractive Offers for Dealers and Wholesale Customers

We commit to reasonable motor prices, offering the best electric motor products with high discount policies for bulk purchasers and distribution units. The more you buy – the better the profit.

Quality Commitment – Powerful Operation, Power Saving

Thanh Thai Motor sells electric motors wound with 100% copper wire, helping the machine run powerfully, consume less electricity, operate smoothly, and effectively reduce vibration – extending equipment lifespan. When purchasing an electric motor, prioritizing products with 100% copper core will be a wise decision, bringing long-term value.

At Thanh Thai Motor, we provide a full range of products, with various phases and capacities, such as:

• 220V electric motors (or 220V 1-Phase electric motors) are 1-Phase electric motors commonly chosen for many household appliances and light industrial equipment, offering convenience and efficiency.
• 380V electric motors are 3-Phase electric motors using three-phase power, commonly used in heavy industrial applications.

Full CO, CQ Certification Documents

Thanh Thai Motor provides the best quality electric motors. Each imported electric motor product from Thanh Thai Motor comes with a Certificate of Origin (CO) and a Certificate of Quality (CQ), meeting the requirements for large projects, constructions, and strict technical documentation.

Contact for Purchase

Do you need to buy an electric motor or seek advice on choosing an affordable electric motor that suits your needs? Contact Thanh Thai Motor immediately using the methods below:

• WhatsApp: +84966596219
• Email: codienthanhthai@gmail.com