BQD Series Explosion-proof Motor...

◆ This explosion-proof motor switch are made of Copper-free Aluminium Alloy, can ensure safety by containing internal explosions and isolating the external hazardous atmosphere.
◆ Enclosure of the explosion-proof motor starter treated with anti-static coating and all fasteners are anti-loosening.
◆ The explosion-proof motor switchgear features a modular internal design, allowing for individual component replacement and easy maintenance.
◆ The integrated circuit breaker provides a clear isolation point, ensuring complete power cutoff to the flameproof motor switch during maintenance.

TECHNICAL DATA

Standards: CENELEC, IEC, NEC
Zones:
- Zone 1 and Zone 2
- Zone 21 and Zone 22
- Class I, Zone 1 and Zone 2
- Class I, Division 1, Groups C, D
Explosion Protection Ratings:
- IECEx (Gas and dust): Ex db IIB T6 or T5 Gb; Ex tb IIIC T80°C or T95°C Db
- ATEX (Gas and dust): II 2 G Ex db IIB T6 or T5 Gb; II 2 D Ex tb IIIC T80°C or T95°C Db

Product Type: BQD-IIB
Material:
- Enclosure: Copper-free Aluminium Alloy, powder coated surface
- Exposed fastener: Stainless steel
Enclosure Color: Window grey (RAL7040)
Components:
- MCB (miniature circuit breaker)
- AC contactor
- Thermal overload relay
- Indicator, pushbutton
Rated Voltage: 380/400V AC 50/60Hz
Degree of Protection: IP66
Ambient Temperature:
- T6/T80°C for Tamb: -60°C ~ +50°C
- T5/T95°C for Tamb: -60°C ~ +60°C
Internal & External Earthing: M6/M8
Cable Entries: Standard M$\square$ x 1.5 plug; See Selection table as below
Entry Direction: Bottom
Cable Glands: Optional, DQM-II (Ex d) or DQM-III (Ex d) is recommended

Explosion-proof motor starters are considered “standard equipment” across numerous high-risk industries, providing indispensable safety in hazardous environments such as oil, chemical and natural gas processing, pharmaceuticals and food production, mining, grain storage and processing, as well as maritime, port, and railway operations.
Compliance: For Hazardous Areas, the use of explosion-protected electrical equipment is a mandatory requirement under industry standards. Utilizing certified ex motor starters is essential for enterprises to achieve legal and regulatory compliance in production, thereby mitigating risks associated with non-conformance.

Certifications: Certified to ATEX, IECEx, EAC and so on; they meet stringent global requirements.
Reliability: Motor Starter for Hazardous Locations are engineered for safety in hazardous environments. It functions not just as a protective firewall for personnel and the environment, but also as a stabilizer for continuous production.

Q1: Does “explosion-proof” mean the device itself will not explode?
- A1: No. The principle of explosion-proof equipment is “explosion isolation”: It allows internal components to generate electrical sparks or even explode, but its robust housing can withstand the explosion pressure and prevent flames from spreading to the outside. At the same time, it controls the surface temperature to avoid becoming an ignition source.
Q2: Can explosion-proof motor switches be used outdoors or in humid environments?
- A2: Yes, but additional conditions must be met:
  - Select a housing with a high protection rating (e.g.: IP66) to prevent rain and salt spray intrusion.
  - The material must be corrosion-resistant (e.g.: stainless steel or coated cast aluminum).
  - Outdoor installation may require additional measures for sun protection and lightning protection.
Q3: Why is the combination of “circuit breaker + contactor + thermal relay” necessary?
- A3: The three components work together in a coordinated manner to provide complete protection:
  - Circuit breaker: Provides short-circuit protection, instantly cutting off high fault currents.
  - Contactor: Enables frequent starting and stopping of the motor and allows remote control.
  - Thermal relay: Provides overload protection, preventing the motor from burning out due to prolonged overcurrent.
  - Integrated design (combination starters) saves space and simplifies wiring.