Control Navigation Autopilot Systems Encapsulated Epoxy Potting Transformer for PCB Mounting

• Customization: Available
• Application: Power, Electronic, Instrument, Lighting, Rectifier, Audio
• Phase: Single
• Model NO.: EI
• Core: Core-type Transformer
• Cooling Method: Dry-type Transformer
• Winding Type: Multi-winding Transformer
• Certification: ISO9001
• Usage: Single-phase Transformer
• Frequency Characteristics: Low Frequency
• Shape of Core: EI
• Operating Temperature: -40ºCTO +125ºC
• Storage Temperature: -25ºCTO+85ºC
• Customize: Yes
• Type: Ei/Toroidal
• Installation Method: Vertical/Horizontal/with a Base/with a Cover
• Transport Package: Export Standard Carton and Strong Pallet
• Specification: EI Series Low Frequency Transformer
• Origin: Zhejiang
• Production Capacity: 200000 PCS/Month
• Package Size: 12.00cm * 10.00cm * 8.00cm
• Package Gross Weight: 2.000kg

Product Description

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Specification

Ⅰ. Specifications and Selection

1 Q: We need a 220V to 12V step down transformer. What specifications will be needed for production?

A: Please provide the following key parameters, the more detailed the better:

Input Voltage (Primary Voltage): For example, AC 220V. Is there an allowable fluctuation range (e.g. ±10%)?

Output Voltage and Current (Secondary Voltage & Current): For example, AC 12V, what current (A) or power (VA/W) is needed? If there are multiple output groups, please list the voltage current of each group.

Rated Power (Rated Power): The unit is VA (volt-ampere) or W (watt). This is one the most important parameters, determining the transformer's load-carrying capacity.

Frequency (Frequency): 50Hz or 60Hz?

Construction (Construction): Is it toroidal, EI type (frame-type), or R-type? Is there a special installation method (such vertical, horizontal, with a base, with a cover)?

Insulation Grade (Insulation Class): For example, Class A (105°C), Class (120°C), Class B (130°C), which is related to the transformer's heat resistance and lifespan.

 

2. Q: What is the difference between the power unit VA and W? How should I choose?

A: For purely resistive loads (such light bulbs, heating tubes), VA ≈ W. For inductive or capacitive loads (such as motors, appliances), W (real power) < VA ( power). To ensure safety, please select according to the apparent power (VA) of the load and leave a margin of 20%-30%. For example, 100W motor, it is recommended to choose a transformer of 120VA-150VA.

 

3. Q: Toroidal transformer or traditional EI transformer, which one should I choose?

A: The main differences are as follows, please choose according your priorities:

Characteristics	Toroidal transformer	EI Transformer
Efficiency	High (no air gap in magnetic circuit)	Lower
Leakage Magnetism/ Interference	Very little (magnetic field enclosed)	Larger
Volume and Weight	Smaller and lighter (for the same power)	Larger and heavier
Production Process	More complex	Mature and simple, easy to maintain
Application Scenarios	High-end audio, precision instruments occasions with high EMI requirements	General industrial equipment, conventional power supplies, cost-sensitive applications
Cost	Higher	Lower, cost-effective

4. Q: Is there a "shielding layer" in transformers? What is it used for?

A: Yes, you can specify the model needs a shielding layer. The shielding layer (usually a layer of copper foil) is located between the primary and secondary coils and is grounded, which can effectively suppress high- interference from the primary to the secondary, enhancing the equipment's ability to resist electromagnetic interference (EMI), which is essential for audio equipment and measuring instruments

5. Q: How to ensure the quality and service life of the transformer?

A: We ensure quality through the following aspects:

Material: new high-grade silicon steel sheets (such as H18, H14), 100% pure copper wire (not copper-clad aluminum), and materials of Class B (130°C) or above.

Process: Vacuum impregnation (VPI) process to ensure moisture resistance, shock absorption, dissipation, and insulation strength.

Testing: Conduct the following tests at 100% before leaving the factory: Dielectric strength test (Hi-Pot Test, such AC 3000V between primary and secondary), inter-winding test, load test, no-load current test, etc., and provide test reports.

II. Price and Delivery

7. Q: What is the price and what is the minimum order quantity (MOQ)?

A:Transformers are usually custom-made products, and the price and MOQ depend on your specific specifications and quantity.

Price factors: The higher the power, the higher the material requirements such as copper, silicon steel sheet prices), and the more complex the process (such as Toroidal, shielded), the higher the unit price.

MOQ For standard specifications, the MOQ may be lower (such as 100pcs). For fully custom specifications, since it requires mold opening (such as EI core mold) and sampling, the MOQ will be higher (such as 500-1000pcs). The larger the quantity, the lower the price.

8. Q: How long does the delivery take?

A: The delivery time also depends on the degree of customization and the quantity.

Standard products/small: Usually 10-15 working days.

New customization (sample confirmation required): It takes an additional 5-7 days for sample making and confirmation.

Large orders: It may take 15-30 days.

Please note that sharp fluctuations in raw material prices may also affect the delivery time.

Ⅲ.Service and Support Category

9. Q: Can samples be provided? How are samples charged?

A: Sure, we support sample for serious customers.

Sample Fee: Usually, sample fee is required, which can be refunded or deducted after placing a bulk order.

Sample Lead Time: Sample usually takes 3-5 days.

Confirmation: We will arrange bulk production only after you confirm that the sample is OK.

10. Q: What could be possible reasons if the transformer is broken? Do you provide warranty?

A: Common damage reasons:

Overload: The load power exceeds the transformer's rated power.

Short circuit: Short circuit at the output end causes a momentary large current to burn out.

Harsh Environment: Working in a high-temperature, humid environment for a long time to insulation aging.

We usually provide a 1-year warranty period. If it is a quality issue of the product, we will repair or replace it for free.

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