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  • Q Variable Frequency Drive Wiring Accessories

    A MCCB (molded case circuit breaker)
    Do not use a circuit breaker for start/stop operation. When a ground fault interrupter is used, select the one with no influence for high frequency. Setting current should be 200mA or above and the operating time at 0.1 second or longer to prevent malfunction.

    MC (magnetic contactor)
    It is not always necessary to have the MC on the input side. However, an input MC can be used to prevent an automatic restart after recovery from an external power loss during remote control operation. Do not use the MC for start/stop operation.

    When power capacity is significantly large compared to inverter capacity, or when the power factor needs to be improved, externally connect an AC reactor. Many 
    VFD manufacturers install reactors in the drives. It is always a good idea to check.

    Input Noise Filter
    To comply with certain communication and interference regulations, input noise filters are to be installed. Many manufacturers include these filters.
    Variable Frequency Drive
    Wire input to terminals L1, L2 and L3 for three phase input. Make sure to connect the ground terminal to an appropriate safety ground.

    Output Noise Filter (EMI Suppression)
    When used with 
    output noise filter, radiated and conducted emissions may be reduced. dT/dV filters protect motors from EMI and voltage transients output from the drive itself. Not required if the motor is “inverter” rated.
    multiple motors are driven in parallel with an VFD, the VFD rated current should be at least 1.1 times the total motor rated current. Make sure that the motor and the variable frequency drives are separately grounded.
  • Q How does a frequency inverter work?

    A A frequency inverter is an electronic device which enables the conversion of an electrical variable "current",In three-phase motors, the speed and torque of the AC motor can be controlled by varying the frequency. This control does not restrict the performance of a three-phase motor, it just improves its efficiency.
  • Q What is a Variable Frequency Inverter Drive?

    A variable Frequency Inverter drive (also termed adjustable-frequency drive, variable speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage.
    Frequency Inverter are used in applications ranging from small appliances to the largest of mine mill drives and compressors. About 25% of the world's electrical energy is consumed by electric motors in industrial applications, which are especially conducive for energy savings using Frequency Inverter in centrifugal load service.
    A frequency inverter changes output voltage frequency and magnitude to vary the speed, power, and torque of a connected induction motor to meet load conditions. A typical frequency inverter consists of three primary sections:
    Rectifier,Intermediate circuit and dc bus Inverter
  • Q How to deal with the faulty?

    Firstly, Our products are produced in strict quality control system and the defective rate will be less 
    than 0.2%.
    Secondly, during the guarantee period, we will send new box with new order for small quantity. For 
    defective batch products, we will repair them and resend them to you or we can discuss the solution 
    including re-call according to real situation.
  • Q Do you offer guarantee for the products?

    Yes, we offer 1 year warranty to our products.
  • Q Is it OK to print my logo on waterproof junction box product?

    Yes. Please inform us formally before our production and confirm the design firstly based on our sample.
  • Q How to proceed an order for waterproof junction box?

    Firstly let us know your requirements or application.
    Secondly We quote according to your requirements or our suggestions.
    Thirdly customer confirms the samples and places deposit for formal order.
    Fourthly We arrange the production.
  • Q How do you ship the goods and how long does it take to arrive?

    We usually ship by DHL, UPS, FedEx or TNT. It usually takes 3-5 days to arrive. Airline and sea shipping also optional.
  • Q Q3. Do you have any MOQ limit for waterproof junction box order?

    Low MOQ, 1pc for sample checking is available
  • Q Q2. What about the lead time?

    Sample needs 3-5 days, mass production time needs 1-2 weeks for order quantity more than 
  • Q Can I have a sample order for waterproof junction box?

    Yes, we welcome sample order to test and check quality. Mixed samples are acceptable.
  • Q Do you have a price list?


    Waterproof electric product is customized product; all prices will depend on customer Marketing data and qty request, it will be difficult to provide it.

  • Q What’s your standard delivery time?

    A Our standard delivery time will be 3~5day for sample, 1~2weeks for
    large batch according to production volume and customer request.
  • Q Are you a manufacturer (Factory) or trading company?

    A Bsumwell is a manufacturer with a mass production of 5000 sqm factory and a medium-size production for small-medium volume. 
  • Q What is ABS?

    A ABS is engineering-plastics.

  • Q What about BSWELL distribution box?

    A BSUMWELL distribution box is waterproof ,dustproof and moisture-proof.
  • Q Why choose wifi smart plug socket?

    A Because much smart
  • Q Shipping way

    A We can arrange by Air,by express,by Sea,by Road.

  • Q Payment

    A 1.Which payment can we use? A:T/T,Paypal,Western union,Cash,Escrow,L/C an so on.
  • Q PS-US005 US Type Wifi wall socket

    A 1.Can we order 10pcs as sample order? A:No,for sample order,we only supply 1-2pcs. after test,then MOQ.:500PCS 2.Can we change the color? A:Yes,Black and White color MOQ.500Pcs,The other colors MOQ.3000Pcs. 3.Can we make our Logo on product? A:Yes,MOQ:1000PCS,also please give us the brand letter. 4. How long for manufacturing once we place order? A:Manufacturing time always is within 30days after get payment. 5. How long to receive 1 samples? A:Within 3days after get payment.


Contact Us

Address: B807,Gaosheng Building, Zhongxin Road,Wanfeng,Xinqiao Street,Bao'an District,Shenzhen China
Moblie:  +86 13316502799
E-mail:  sales@bsumwell.com  
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