Explosion-proof motor
Wolong Electric Nanyang Explosion-ProofYBX5 Series Ultra-High-Efficiency Flameproof Three-Phase Asynchronous Motors
The YBX5 Series Flameproof Three-Phase Asynchronous Motors (frame sizes 80–355) are fully enclosed, self-cooled, squirrel-cage motors developed by Wolong Electric Nanyang Explosion-proof. They achieve ultra-high efficiency levels of IE5 (1), meeting the requirements of GB18613-2020 "Energy Efficiency Limits and Grades for Small and Medium Three-Phase Asynchronous Motors." These motors feature superior performance, safe and reliable operation, and lower vibration and noise compared to similar products, while complying with environmental standards. Explosion protection meets GB 3836.1 "Explosive Atmospheres – Part 1: Equipment – General Requirements" and GB 3836.2 "Explosive Atmospheres – Part 2: Equipment Protected by Flameproof Enclosure 'd'". They are suitable for areas with explosive gas mixtures and hazardous zones 1 and 2. The explosion-proof markings include Ex d I Mb, Ex d IIB T4 Gb, and optionally Ex d IIC T4 Gb. Widely used in petrochemical, coal mining, mining, port, power plant, and mechanical industries, these motors drive various general-purpose machinery such as fans, compressors, water pumps, crushers, winches, centrifuges, machine tools, and transport equipment. Model Example: YBX5-160L-2 THWF1 - YBX5 indicates the flameproof series with IE5 energy efficiency grade (GB18613-2020, Grade 1). - 160 denotes frame size in mm. - L indicates a long foot. - 2 specifies the number of poles (2). - Suffixes denote environmental ratings: F1 (indoor, moderate corrosion), F2 (indoor, severe corrosion), WF1 (outdoor, moderate corrosion), WF2 (outdoor, severe corrosion), TH (tropical humid), G (high altitude). Default is indoor.
Technical Specifications
- Housing Number80~355
- Rated Power0.18kW~315kW
- Efficiency RatingIE5 (GB18613-2020, Energy Efficiency Level 1)
- Jisu2P, 4P, 6P, 8P (Optional 10P, 12P, 14P, 16P)
- Rated Voltage38V (optional: 220/38V, 380/66V, 660/114V, 400/69V, 40V, 66V, 69V, or custom per customer request)
- Rated Frequency50Hz (optional 60Hz)
- Working ModeS1 (Optional S2, S3; Customizable)
- Ambient Temperature-20℃~+40℃
- AltitudeNot exceeding 1000m
- HumidityMonthly average maximum relative humidity shall not exceed 90%.
- Installation MethodB3 (Optional: B5, B6, B7, B8, B14, B34, B35, V1, V3, V5, V6, V15, V18, V35, etc.)
- Wiring method3kW and below: 380V Y connection; motors above 3kW: 380V △ connection
- Ingress Protection RatingIP55 (optional IP56, IP65, IP66, etc.)
- Insulation ClassClass F (H-class optional)
- Cooling MethodIC411
- Explosion-proof markingEx d I Mb, Ex d IIB T4 Gb, Ex d IIC T4 Gb
- Inlet ConfigurationFlared opening (standard configuration; optional threaded steel conduit or explosion-proof cable gland entry)
- Number of Inlets80~280 Single-port, 315, 355 Dual-port
- Motor Enamel Paint ColorLight Blue RAL5012 (Anti-corrosion and outdoor anti-corrosion types use Phthalocyanine Blue GSB05-1426PB04)
- EnvironmentIndoor (Optional: Outdoor W, Outdoor Moderate Corrosion Resistance WF1, Outdoor Severe Corrosion Resistance WF2, Indoor Moderate Corrosion Resistance F1, Indoor Severe Corrosion Resistance F2, Humid Tropical TH, Dry Tropical TA, Outdoor Humid Tropical THW, Outdoor Dry Tropical TAW)
- Temperature measurement and heating deviceHousing numbers 160–225: optional heating tape or PTC temperature sensor. Housing numbers 250–355: optional stator and bearing temperature sensors, heating tape, and explosion-proof breather with drainage valve.
- bearing80~132 are sealed bearings (6204/2Z~6308/2Z); 160~355 are open bearings (6309~6322). Relubrication interval: 2000~3000h.
- Shaft extensionType B center holes are standard; Type C threaded holes on the shaft end (DB size) are added per user requirements.
- StandardGB/T 755, GB 1971, GB 3836.1, GB 3836.2, GB 3836.3, GB 10068, GB 14711, GB 18613, GB 50058, GB/T 997, GB/T 1032, GB/T 1993, GB/T 4772, GB/T 4942.1, GB/T 10069.1, GB/T 10069.3, GB/T 22719.1
Key Advantages
High Energy Efficiency: Complies with GB18613-2020 standard, achieving 1-star energy rating (IE5). Full-load efficiency for 355 frame size and 2 pole models reaches up to 97.2%, resulting in lower electricity costs during long-term operation.
Full explosion-proof certification: Flameproof "d" protection covering Ex d I Mb, Ex d IIB T4 Gb, and Ex d IIC T4 Gb. Suitable for coal mine underground applications and hazardous gas environments in Zone 1 and Zone 2 industrial settings.
Low vibration, low noise: Model 8 features a sound pressure level as low as 49 dB(A) and meets GB 10068 Class A vibration limits to improve on-site working conditions.
Wide pole coverage: Standard 2/4/6/8 poles, optional 10/12/14/16 poles; synchronous speed 3000~375 r/min for low-speed, high-torque applications.
Multi-voltage support: Standard 380V; optional 220/380V, 380/660V, 660/1140V, 400/690V, 660V, 690V. Current for non-380V operation is calculated as I = IN × 380 / U.
Easy interchangeability: Mounting dimensions for frame sizes 80 to 355 comply with IEC and national standards, enabling quick replacement of existing explosion-proof motors.
Flexible structural configuration: B3 standard installation with optional configurations including B5, B35, V1, B14, and B34. Protection class, insulation level, corrosion resistance rating, and topcoat color are all customizable.
Status monitoring: 160~225 bases can be equipped with heating strips or PTC temperature sensors; 250~355 bases can include stator and bearing temperature sensors, heating strips, and explosion-proof breathing drainage valves.
Environmentally adaptable: Choose from designations for outdoor, moderate/strong corrosion resistance, humid tropical, dry tropical, and high-altitude environments. Ambient temperature and altitude can be customized per GB/T 755.
Comprehensive terminal box specifications: Six main terminal box sizes ranging from M5 to M16, standard flared inlet, with optional threaded steel conduit or brass nickel-plated explosion-proof gland entry.
Use Cases
petroleum refining unit
Chemical Process Pumps and Compressors
Non-mining and non-excavation work areas in underground coal mines
Mining Crushing and Conveying Equipment
Port and Terminal Handling Equipment
Power Plant Auxiliary Drive
Machine Tool Cutting Machinery
Universal Drive for Fans and Pumps
Explosion Protection Rating Explanation
View All Explosion-Proof MotorsExplosion-proof for underground coal mines
Suitable for locations such as underground coal mine areas other than mining and excavation faces where explosive methane gas atmospheres exist. "Mb" indicates a higher level of protection.
Filter products at this levelFactory IIB Flameproof
Suitable for IIB flammable gas environments such as ethylene and coke oven gas. T4 indicates the equipment's maximum surface temperature does not exceed 135°C; Gb denotes a high level of protection.
Filter products at this levelFactory-rated, IIC explosion-proof
Suitable for IIC explosive gas environments including hydrogen, acetylene, and carbon disulfide; covers all IIA and IIB gas groups for broader protection.
Filter products at this levelExplosion-proof marking explanation: "Ex" denotes explosion-proof; "d" indicates a flameproof enclosure; "tb" signifies an enclosure protection type (for dust explosion-proof). "I", "IIA", "IIB", and "IIC" represent applicable gas groups, while "IIIA", "IIIB", and "IIIC" indicate applicable dust categories. "T1–T6" or "T130°C" specifies the temperature class and maximum surface temperature. "Mb", "Gb", and "Db" denote equipment protection levels. When selecting equipment, verify based on the site's hazardous area classification (gas zones 1, 2 or dust zones 21, 22), medium group, and temperature class.
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YBX5 Series Ultra-High-Efficiency Flameproof Three-Phase Asynchronous MotorsProduct Catalog (PDF) – Download for full technical specs, installation dimensions, and selection tables.
YBX5 Series Ultra-High-Efficiency Flameproof Three-Phase Asynchronous MotorsProduct Catalog
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