Pcb mount encapsulated power transformer EI series

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Basic Info.
  • Brand Name: HANG TUNG 
  • Usage: Electronic 
  • Coil Number: Autotransformer 
  • Phase: Single 
  • Coil Structure: Toroidal 
  • certificate: ROHS CE ISO9001 
  • winding: according to customer 
  • size: according to customer 
  • Model No: EI41 
  • Frequency: 50Hz or 60Hz 
  • Rated voltage: <500V 
  • Model No.: ei41 
  • Place of Origin: Guangdong  
  • Min.Order: 1000 Piece/Pieces
  • Means of Transport: Ocean, Air, Land
Supply Capacity
  • Production Capacity: 5000/day
  • Packing:carton
  • Delivery Date: 15-30days

EI41 24V UL power transformer   


EI41 Transformer with Cable

Single or Dual Primary)115/230V)

·Designed to meet International Safety Requirements

·Inherently Limited Versions available

·UL94V-0 Rated materials

·4500 Vrms Isolation Strength(Pri:Sec)

·Designed for EN60950,UL1477 and UL1581

·Class B Insulation

Transfer AC voltage of 100V, 110V, 120V, 200V, 220V, 230V, 240V to lower AC voltage. The input could be provided with single, double or triple voltage winding. Output can be provided from single to several winding. The size of our EI Transformer from EI-28 to EI-114, capacity up to 150W. We can supply with both screw mountings and pin dipping types.

This single-phase transformer is widely applied to the little power of DVD, hi-fi stereo, TV, small adaptor, beauty equipment, instruments and Apparatuses equipment, stage light, lighting control circuit, air-conditioning equipment control circuit, medical equipment, monitoring equipment, automation equipment control circuit, machinery and equipment, energy-efficient equipment.
Basic Data 
Capacity: 1VA-100VA 
Phase: Single 
Input: AC Power with Voltages of Various Countries 
Output: AC Current, Voltage, According to Customers Requirements 
Frequency: 50-60Hz 
Voltage Regulation: 12%-3% 
Manufacture Standard: GB/T15290-94, GB/19212-2006, GB2828-2829-87 
Insulation Class: B, 130 Celsius Degree; E, 120 Celsius Degree 
Temperature-rise: ≤85 Celsius Degree

perature-rise: ≤85 Celsius Degree 



a) High efficiency
b) Low heat generation
c) 3 frames or full isolation bobbin
d) The cores are lapped by silicon steel sheet of high - quality and have been treated by insulation 
e) Clean appearance and convenient installation
f) Competitive pricing.

Testing Items:
No-load Test(No-load Current, No-load Voltage, No-load Loss)
Load Test (Load Voltage, Temperature-rise)
Inductive Voltage Test
DC Resistance Test 
Safety Test

Operating environment:
1) Temp.: The ambient temperature can not over +40°C.
2) Altitude: Mounting location can not exceed the altitude of 2000m
3) Relative humidity: Maximum 90%
4) The site not attack by rain and snow
5) The medium which no explosion danger, no corroding metal, no electrical breakdown


Feature of Low Frequency Transformer 

1.Small idle current

2.Strong load capacity

3.Multiple output windings


Technology parameters of Power supply transformer:

1.Primary voltage: 440V/415V/380V/220V/200V( Customer designated)

2.Secondary voltage:380V/220V/200V/110V/100V/36V/24V/12V/6.3V/3.6V( Customer designated)

3.Operational frequency:50/60Hz

4.Insulation class: T40/B(130℃);T40/F(155℃); T40/H(180℃)@50Hz&Rated current

5.Dielectric strength:P-S 2500V/1min  No breakdown

6.P-E 2500V/1min  No breakdown

7.Insulation resistor:≥100MΩ

8.Cooling way:(Air cooling)

9.Linking way:Y/Y Y//Y  Customer designated

10.Temperature rise limitation:Core does not exceed 80K(thermometer method)),the coil temperature does not exceed 80K(platinum resistor method).

11.Working noise:<60dB(horizontal distance with transformer is 1 meter)

 power transformer







Thick of Iron core(MM)


Maximum output power(W)


Input rated voltage

 Single phase:220VAC

Operation efficiency


Output voltage


Output current








Temperature rise


Waveform distortion


Dielectric strength

 2000V,Without breakdown in one minute

Insulation Resistor

 Winding insulation resistor to single phase≥2.2MΩ

Conditions of Use

 1.Ambient Temp.:-15℃~+40℃

 2.Relative humidity:≤85%

Input/Output voltage(V)

Single phase input voltage can meet the requirements 
of different regions:AC240-230-220-120-115-110-100,
Also designed according to customer special 
requirements.Output voltage is designed according 
to customer requirements


EI41*20 low frequency transformer shown as the above is one of the related technical parameters.Our 

company can make low frequency transformers(EI28-EI105)

with different specifications according to client's requirement. 

Welcome to inquire.


Widely used in instruments,power supply of 
instruments,switching power supply, power adapter, 
chargers, LED power supply and laptop power supplies.


The price mainly depends on the process complexity 
of the product,customer demand for raw materials, 
and whether to ask a safety certificate, etc.


Product Details

Capacity: 1VA-550VA 
Phase: Single 
Input: AC Power with Voltages of Various Countries 
Output: AC Current, Voltage, According to Customers Requirements 
Frequency: 50-60Hz 
Voltage Regulation: 12%-3% 
Insulation Class: B, 130 Celsius Degree; E, 120 Celsius Degree 
Temperature-rise: ≤85 Celsius Degree

The Pcb mount encapsulated power transformer EI41  inspection subject:


1.No-load test (Included no-load voltage, no-load current and no-load loss)


2.Load test (Included load voltage and temperature rise)


3. Inductive voltage test


4.DC resistance test


5.Insulation resistance


6. Hi-POT test CRGO


7.Outlook inspection


Send message to this supplier
Mr. Ken Lo (Manager)
Tel: 86-769-86638188
Mobile: 18103060006
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Contact Method
Hangtung Electronic Technology Co., LTD.
Shijie Town, Dongguan, Guangdong, China (Mainland)
Fax: 86-769-86631396
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