300VA Waterproof Type Toroidal Tansformer 220-240VAC 12VAC/25A
Features
(1) Core from 0.23mm thick silicon steel Japanese materials 23Q115
edges are ground smooth
(2) Core protection from 4 layers polyester films (2 layers with
50% overlap)
(3) Primary winding wire ( polyesterimid enameled QZY 180) and
temperature class 180°
(4) Primary leads from type UL1672 double insulation for 600V
voltage and 105° temperature
Specifications
| Item | Description |
| Capacity | 300VA |
| Frequency | 50/60Hz |
| Max. Temperature | 60℃ |
| Temperature rise | <60℃ |
| Insulation class | B/F |
| Voltage ratio | 220-240VAC-22VACx2 |
| Winding material | Copper |
| Insulation Resistance | PRI.-SEC.: 500V DC 100 MΩ/Primary to Secondary 500VDC 100MΩ Min. |
| Short-Circuit of winding turn | PRI. Iput: 440V AC 150HZ/ Primary and Secondary Not break down) |
| Hi-Pot Test | PRI.-SEC.: 4.2KV/5mA/2S / Primary and Secondary Not break down ) |
| Mounting metal plate | Provided |
| Rubber gasket | Provided |
| Standards | VDE0550/IEC204-1/IEC61558/EC439 |
| Warranty | 24monthes |
VA Calculation
1. Read the transformer’s secondary winding rating (printed or
tagged on the transformer case). This should give a rating such as
5V, 500mA.
Multiply the voltage times the current to receive the VA.
Example: 5V times 500mA (or 0.5A) equals 2.5VA
2.Convert the secondary winding VA value to the primary winding VA
rating as the equation VA (Primary) equals VA (Secondary) or VA
(p)=VA(s)
For example of a 2.5VA secondary, if the primary voltage is 120V
the current will be A (p) = VA(s) / V(p). Giving A(p) = 2.5 / 120 =
0.020833(roughly 21mA).
This is the calculation for a single input winding/single output
winding transformer.
3. Add the separate VA ratings for a transformer with multiple
secondary windings.
For secondary winding 1 = 5VA at 500mA
Secondary winding 2 = 24V at 100mA
Total Secondary VA = ( 5 X 0.5 ) + ( 24 X 0.1 ) = 4.9VA
Primary VA will still equal the total secondary VA.
FAQ
1. Q: Can I have a sample order?
A: Yes, we welcome sample order to test and check quality.
2. Q: What is the lead time?
A: Sample time 3-7 days, we usually ship by DHL, UPS, FedEx,etc.
Mass production time 7-25 days.
3. Q: How long is the warranty?
A: 24 monthes from B/L. If there are any accessory problems,just
provide the photos of damaged accessory,then we will provide free
service. According to the number of products,we will provide easily
damaged accessories for free. we also can provide technical support
if you need.
4. Q: Is OEM/ODM available?
A: Yes,it is! We are manufacturer with our own R&D team, we can
customize products according to customer's drawing or requirements.
Customized services:
a. Customized color and special function.
b. Customized box.
c. Print customer's logo(MOQ:≥10pcs).
d. Your other ideas about product, we can help you design and put
them into production. The above customized services must be
confirmed before production.
5. Q: How to control the products quality?
A: Our company owns the core technology ,all kinds of products hold
CE certificate. We have professional engineers. Workers are
strictly required to make products according to the drawings. Each
process has technical instructors.The QC supervisors will regularly
inspect the production. We will do products performance tests
during production, and comprehensive quality tests when the
products is completed.
