Explore our premium selection of heavy-duty asynchronous, synchronous, and direct current (DC) electric motors engineered to comply with stringent European, American, and International safety standards.
Unveiling the exact technical designations of explosion-proof induction motors operating in Zone 1 and Zone 2 hazardous gas atmospheres.
The coding Ex d II C T4 Gb specifies a strict engineering hierarchy. The symbol "d" indicates a flameproof enclosure system compliant with standard IEC/EN 60079-1. Unlike designs that prevent gas penetration, a flameproof enclosure permits explosive gas to enter, but its structure is robust enough to withstand the resulting internal pressure. The flamepath joints cool and quench the escaping hot gases before they can trigger external combustion.
The gas group designation "IIC" represents the highest level of industrial risk, denoting environments with gases like Hydrogen, Acetylene, and Carbon Disulfide. These gases require narrower flamepaths and precise machining tolerances. The temperature class rating "T4" limits the maximum external surface temperature of the motor frame to 135°C, ensuring safety even in environments with low auto-ignition points.
Deploying equipment within hazardous zones requires certified reliability. Selecting a motor from an established manufacturer guarantees compliance with global safety requirements, protecting both assets and lives.
| Classification Code | Protection Type | Gas Group Capability | Max Surface Temp | Protection Level (EPL) | Typical Applications |
|---|---|---|---|---|---|
| Ex d IIB T4 Gb | Flameproof Enclosure | Group IIB (Ethylene, Propane) | ≤ 135°C | Zone 1 & Zone 2 (High Safety) | Petroleum Refineries, Gas Processing Plants |
| Ex d IIC T4 Gb | Flameproof Enclosure | Group IIC (Hydrogen, Acetylene) | ≤ 135°C | Zone 1 & Zone 2 (Extreme Safety) | Hydrogen Refueling Stations, Chemical Synthesis |
| Ex tD A21 T135°C | Dust Ignition Protection | Group IIIA, IIIB, IIIC (Combustible Dust) | ≤ 135°C | Zone 21 & Zone 22 (Dust Hazard) | Grain Silos, Coal Pulverization, Carbon Processing |
From a state-owned enterprise in 1955 to a modernized, global industrial motor supplier in Xi'an, Shaanxi, China.
Founded in 1955, SIMO Motor has over 60 years of history in design, fabrication, and global sales. Operating as a key enterprise in the Chinese mechanical sector, SIMO specializes in large, medium, and low-voltage AC/DC induction motors, synchronous machines, and explosion-proof equipment.
With a registered capital of 21.5 million RMB, the group operates three manufacturing plants and one subsidiary, supported by fixed assets of 380 million RMB. Our facilities feature more than 1,172 sets of advanced production and testing equipment, enabling comprehensive design, tooling, metal machining, assembly, and quality assurance testing.
Our workforce of over 1,200 employees includes 260 technical engineers, 21 senior engineers, and 15 expert engineers. This core team manages research and development to align our products with domestic and international requirements.
SIMO Motor established and led by government initiative.
Moved to new plant in Xi'an city to expand heavy industrial capabilities.
Renamed Xi'an Motor Factory after acquisition and integration of state assets.
Reformed into a limited liability company from a state-owned factory.
SIMO Motor Group established, managing 14 manufacturing subsidiaries.
Relocated to a modernized, high-tech industrial park for advanced manufacturing.
Renamed Tech Full Simo Motor, expanding into international markets.
Ongoing modernization to maintain a leading position in industrial motor supply chains.
Analyzing how Ex d IIC T4 motors are deployed in harsh localized operating conditions worldwide.
Offshore platforms present salt spray, high humidity, and explosive gas mixtures (such as methane and hydrocarbons). Motors must resist marine corrosion while satisfying structural safety requirements.
Hydrogen and carbon monoxide environments require Gas Group IIC protection. Because of hydrogen's low ignition energy, Ex d IIC enclosures are built with tight clearances and robust structures.
Underground operations generate coal dust and pockets of methane. Machinery is subject to physical impacts, necessitating high-strength materials (such as our YBK3 series).
How we are driving efficiency, digital monitoring, and insulation innovations for explosion-proof induction motors.
Global regulations continue to push for lower carbon footprints in industrial installations. Traditionally, explosion-proof motors traded electrical efficiency for robust physical security. LITESIMO is bridging this gap by applying high-grade silicon steel sheet laminations and precision stator winding profiles to our YBX4 and YBX5 series, matching IE4 and IE5 performance limits without compromising flameproof integrity.
By reducing internal thermal losses, these high-efficiency motors operate cooler, extending bearing life and widening safety margins in high-temperature (T4) zones.
Manually monitoring equipment in Zone 1 / Zone 2 locations is challenging. The integration of explosion-proof digital telemetry is transforming maintenance workflows. We are incorporating intrinsically safe (Ex i) vibration and temperature sensors into the frame and bearing housings of our high-voltage motors (e.g., YKK and YKS series).
These sensors transmit data to a centralized PLC or cloud monitoring system, enabling maintenance teams to detect bearing wear, winding hot spots, or rotor imbalances before they lead to structural damage.
Why partnering with China-based manufacturers like SIMO ensures secure, reliable, and cost-effective motor procurement.
Our proximity to domestic silicon steel manufacturers, copper refiners, and casting foundries secures stable access to raw materials, insulating production schedules from international supply chain disruptions.
We utilize automated CNC machining centers, automated coil winding arrays, and automated varnish-impregnation systems to deliver consistent frame tolerances and high-quality winding insulation.
Located in Xi'an, a major transport hub, we utilize the China-Europe Railway Express and international shipping links to reliably transport heavy machinery to projects worldwide.
A visual overview of our manufacturing facilities, assembly shops, and product configurations.
SIMO Motor complies with major global quality systems, explosion-proof directives, and localized design requirements.
SIMO has passed ISO9001 Quality System Certification, European Union CE, United States UL, Russian GOST, and Chinese explosion-proof certifications. Our products support applications across power generation, coal mining, petrochemical processing, metallurgical refining, municipal water supply, aviation, and high-technology industries worldwide.
Essential technical answers for procurement teams and industrial field engineers.
Explore additional industrial motor configurations, including variable frequency drives, dust-tight designs, and high-voltage soft-starters.
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