Product OverviewThe YFB4 series is specially designed for hazardous dust environments (suitable for Zone 21 dust atmospheres) and is manufactured to national standards. The motor f

Product Overview

The YFB4 series is specially designed for hazardous dust environments (suitable for Zone 21 dust atmospheres) and is manufactured to national standards. The motor features reinforced sealing and dust-protection structures, optimized ventilation and cooling design, and balances high efficiency with strong resistance to dust ingress for long-term reliable operation. The product is suitable for explosion-proof fans, pumps, compressors, belt conveyors, gearboxes and similar driven equipment, and is widely used in petroleum, chemical, fertilizer, grain milling, powder processing, and other industries that operate in dust-hazard zones (excluding underground coal mines).

Key Technical Features

• Sealed, dust-protected construction: Reinforced sealing rings, enclosed terminal chamber and dust plugs reduce the risk of dust ingress into windings and bearing areas, enabling long-term service in Zone 21 dust environments.

• Ribbed-fin or optimized ventilation cooling: Heat-dissipation design tailored to dust environments ensures acceptable temperature rise and thermal stability during continuous operation.

• High efficiency: Meets IE4 high-efficiency class, covering a wide rated power range (0.75–315 kW), reducing operating costs while improving energy performance.

• Standard compliance & dimensions: Designed to national mounting and interface standards (frame sizes H80–H355), pole options 2–8P, rated voltage 380 V / 660 V, rated frequency 50 Hz; suitable for direct-on-line (DOL) starting; cooling method IC411.

• Insulation & thermal rating: Insulation class F with design verified to B-class temperature-rise limits for reliable thermal endurance and service life.

• Bearings & lubrication: Bearing and lubrication schemes optimized for dust conditions: frames ≤225 use sealed bearings; frames >225 may use re-lubrication or oil-bath lubrication as configured.

• Protection & anti-corrosion: Standard protection IP55; upgradeable to higher protection levels and anti-corrosion treatments to suit humid or chemically aggressive dust environments.

• Dust-proof terminal design: Terminal box, wiring and connector areas feature dust-sealing; top / left / right outlet arrangements available; optional protective covers or isolation devices can be supplied.

• Online monitoring options: Supports PT100 / thermistor sensors, vibration sensors, speed encoders, etc., enabling condition monitoring and preventive maintenance to reduce unplanned downtime.

• Manufacturing & inspection control: Enhanced dust-proof assembly processes and quality control; motors are supplied with explosion/dust protection declarations, inspection reports and required test records.

Typical Technical Parameters (Representative)

• Frame size: H80 – H355

• Rated power: 0.75 kW – 315 kW

• Number of poles: 2P / 4P / 6P / 8P

• Rated frequency: 50 Hz

• Rated voltage: 380 V / 660 V (customizable)

• Efficiency class: IE4 (high efficiency)

• Protection class: IP55 (optional IP65 / anti-corrosion treatment)

• Cooling method: IC411 (standard)

• Insulation & temperature rise: Insulation class F; designed to meet B-class temperature-rise criteria

• Applicable hazardous area: Dust Zone 21 — suitable for locations where combustible dust clouds or layers may be present (select model and protection level according to the actual dust type and zoning)

• Mounting: Horizontal / Vertical (national standard mounting dimensions; flange/base options available)

• Drive / starting: DOL (Direct On Line); VSD (Variable Speed Drive) support available on request

• Operating conditions:

  • Ambient temperature: −15 °C to +40 °C (special conditions可 be customized)

  • Relative humidity: ≤ 90% (at 20 °C)

  • Altitude: ≤ 1000 m (higher altitude designs available on request)

Typical Applications

The YFB4 series is ideal for dust-hazard environments such as flour and grain handling/processing, milling and pulverizing equipment, chemical/fertilizer powder handling, combustible dust transfer systems, and petroleum/coal-chemical processes dealing with dust. It is suitable for fans, pumps, compressors, belt conveyors, gearboxes and similar driven equipment, providing stable power in dusty conditions.

Selection & On-Site Recommendations

• Provide dust details: When ordering or selecting a model, specify dust type (organic dust / metallic dust / etc.), lower explosive limit (LEL) or dust explosion parameters, zoning (20 / 21 / 22), operating temperature and any corrosive media to determine required sealing and protection.

• Higher protection & anti-corrosion: For dusty, humid or corrosive environments, choose elevated protection grades and anti-corrosion finishes; regularly clean heat-dissipation ribs and ventilation ports to prevent dust buildup that impairs cooling.

• Bearing & lubrication for heavy duty: For frequent start-stop or heavy starting torque conditions, specify reinforced bearings, re-lubrication or oil-bath schemes and consider bearing insulation/grounding to prevent electrochemical corrosion.

• VSD advice: If VSD operation is required, specify at order stage; evaluate the need for dv/dt / LCL output filtering and cable shielding to protect motor insulation and reduce shaft currents — inverter parameters and cable length significantly affect motor life.

• Installation & wiring: Follow dust-explosion electrical installation codes: use certified dust-proof explosion-proof cable glands, sealed junction boxes, effective grounding and shielding to ensure on-site safety.

Factory Inspection & Documentation

Each YFB4 motor undergoes strict factory testing before shipment, including visual and seal integrity inspection, dynamic balancing, insulation resistance and high-voltage tests, no-load / load tests (if required), temperature-rise tests, vibration and noise checks, and seal integrity verification. Supplied documents include: factory certificate of conformity, inspection report, technical parameter sheet, installation & maintenance manual, sealing/dust-proof instructions, and explosion/dust-proof conformity declarations or test reports (third-party test reports can be provided upon request).

Ordering Information

When placing an order, please specify: model (YFB4), frame size, rated power, number of poles, rated voltage, whether VSD operation is required, cooling method (IC411), mounting (horizontal/vertical), cable outlet direction, whether bearing insulation/earthing rings are required, any anti-corrosion / enhanced dust-proof treatment, and on-site dust type and zoning. For special environments or critical projects, request a custom design, third-party testing or on-site technical support.

If you need 2D/3D assembly drawings, dust-sealing detail drawings, or specific test reports, please request these with your inquiry or order — we will provide tailored technical documentation and solutions based on site conditions.