Explosion-proof motor
Wolong Electric Nanyang Explosion-ProofYFB5 Series Ultra-High-Efficiency Dust-Explosion-Proof Three-Phase Asynchronous Motors
The YFB5 series dust explosion-proof three-phase asynchronous motors (frame heights 80–355) are fully enclosed, self-ventilated, squirrel-cage, ultra-high-efficiency dust explosion-proof motors independently developed and launched by Wolong Electric Nanyang Explosion-proof. Their efficiency meets Grade 1 (IE5) of GB18613-2020 "Energy Efficiency Limits and Grades for Small and Medium Three-Phase Asynchronous Motors," offering superior performance, safe and reliable operation, and lower vibration and noise compared to similar products, while meeting environmental standards. The motor's explosion-proof performance complies with GB/T 12476.1 "Electrical Apparatus for Use in Explosive Dust Environments – Part 1: General Requirements" and GB 12476.5 "Electrical Apparatus for Use in Explosive Dust Environments – Part 5: Enclosure Protection Type 'tD'." It is suitable for explosive dust environments Zone 21 and Zone 22, with an explosion protection rating of Ex tb IIIC T130℃ Db; it can also be configured as Ex tb IIIB T130℃ Db. These motors are widely used in grain and feed processing, wood manufacturing, metal polishing and grinding, coal chemical industry, pharmaceuticals, textiles, port grain handling, and other sectors to drive general-purpose machinery such as fans, compressors, water pumps, crushers, conveyors, and centrifuges. Model example: YFB5-160L-2 THWF1: - YFB5 indicates the dust explosion-proof series with IE5 energy efficiency grade (Grade 1 per GB18613-2020), - 160 denotes frame height (mm), - L represents a long base, - 2 indicates the number of poles (2), - Suffixes denote environmental conditions: F1 (indoor, moderate corrosion resistance), F2 (indoor, strong corrosion resistance), WF1 (outdoor, moderate corrosion resistance), WF2 (outdoor, strong corrosion resistance), TH (humid tropical), G (high altitude); default is indoor use.
Technical Specifications
- Housing Number80~355
- Rated Power0.18kW~375kW
- Efficiency RatingIE5 (GB18613-2020, Energy Efficiency Level 1)
- Jisu2P, 4P, 6P, 8P (Optional 10P, 12P, 14P, 16P)
- Rated Voltage380V (Optional: 220/380V, 380/660V, 660/1140V, 400/690V, 400V, 415V, 660V, 690V, or custom per customer requirements)
- 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 IP65)
- Insulation ClassClass F (H-class optional)
- Cooling MethodIC411
- Explosion-proof markingEx tb IIIC T130°C Db (optional: Ex tb IIIB T130°C Db)
- Suitable for Hazardous AreasExplosive dust environments, Zone 21, Zone 22
- 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: sealed bearings; 160–355: open bearings. Grease interval: 2000–3000 h.
- StandardGB/T 755, GB 1971, GB/T 12476.1, GB 12476.5, 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.
Dust explosion-proof certification complete: Protection type tD housing, explosion-proof rating Ex tb IIIC T130°C Db. Suitable for Zone 21 and Zone 22 combustible dust environments; also available as Ex tb IIIB T130°C Db.
Low vibration, low noise: Model 8 features a sound pressure level as low as 44 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 compatibility: Standard 380V, with optional 400V, 415V, 660V, 1140V, and more. For non-380V operating conditions, current is calculated as I = IN × 380 / U.
Interchangeable mounting: Frame sizes 80 to 355 comply with IEC and national standards, enabling quick replacement of existing dust-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.
Complete range of junction box specifications: Standard bellmouth design; optional threaded steel conduit or explosion-proof cable glands for sealed wiring in dusty environments.
Use Cases
Grain and Feed Processing Workshop
Woodworking and Furniture Manufacturing
Metal Polishing and Grinding Workshop
Coal Chemical Industry and Coal Powder Conveyance
Pharmaceuticals and Powder Processing
Textile Fiber Workshop
Port Grain Storage and Transportation
Fans and Pumps for Dusty Environments
Explosion Protection Rating Explanation
View All Explosion-Proof MotorsEnclosure protection for combustible dust environments
Suitable for Class IIIC combustible dust environments (conductive and non-conductive), including grain, feed, wood, and metal dust, in Zone 21 and Zone 22. T130°C indicates the equipment's maximum surface temperature does not exceed 130°C. Db denotes a high protection level.
Filter products at this levelExplosion-proof enclosure for Class IIIB combustible dust environments
Suitable for non-conductive combustible dust environments in Zones 21 and 22, specifically for fibrous and fluffy dusts classified as IIIB (excluding IIIC). Select according to the specific dust type present on-site.
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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YFB5 Series Ultra-High-Efficiency Dust-Explosion-Proof Three-Phase Asynchronous MotorProduct Catalog (PDF) – Download for full technical specs, installation dimensions, and selection tables.
YFB5 Series Ultra-High Efficiency Dust-Explosion-Proof Three-Phase Asynchronous MotorsProduct Catalog
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