The encapsulated transformer is manufactured with high-quality EI type silicon steel sheets.
Working frequency: 50~100Hz
Low no-load loss, high power, high efficiency and low temperature rise.
Potting process.
Low noise
Good stability
RoHS compliant.
Ambient temperature –40°C to +145°C
Storage temperature Component: –40°C to +85°C.
Operating temperature:-40℃～125℃(Including coil's temperature rise)
HVAC systems
Control panels
Industrial automation
Medical equipment
Telecommunications
Smart metering and monitoring systems
Household appliances and other equipment.
An encapsulated transformer is a low-frequency mains transformer built using high-quality EI laminated silicon steel cores. The entire structure is sealed through potting technology, protecting it from moisture, dust, vibration, and harsh operating environments. These units operate within 50–100Hz frequency range and meet stringent requirements for efficiency, temperature rise, and RoHS compliance.
YET focus in custom development and low volume methodology allow us to be one of the most flexible and agile manufacturers in the industry.
Our engineering staff has a vast wealth of professional knowledge.YET can deliver custom magnetics products on time to any country.
YET can design and build magnetics from customer design prints, re-engineer to enhance magnetics products to support customer needs, and reverse engineer magnetics products.
High safety standards: Protected by insulation and potting
Low electromagnetic interference
Optimized for power frequency transformer applications (50/60Hz)
Manufactured under strict quality control with consistent performance
Available in multiple sizes and custom designs
Whether you need a standard encapsulated transformer or a customized solution for your equipment, we offer full technical support and fast delivery options. We also maintain inventory for standard models – welcome bulk procurement and OEM inquiries.
| ITEM | YET' P/N | Equivalent Substitutes | ||
| EI30 Series | TDK EI30 | Würth EI30 | ||
| Electrical Parameters | Operating Frequency | 50Hz or 60Hz | 50Hz or 60Hz | 50Hz or 60Hz |
| Rated Power | 5VA～50VA | 5VA～30VA | 5VA～50VA | |
| Input Voltage | AC：110V/230V | AC：110V/230V | AC：110V/230V | |
| Output Voltage | 5V～48VAC | 6V--24VAC | 5V～48VAC | |
| no-load current | ≤10% rated current | ≤10% rated current | ≤8% rated current | |
| Hi-pot | 3.5kVAC (Pri.-Sec.) | 3kVAC (Pri.-Sec.) | 4kVAC (Pri.-Sec.) | |
| Efficiency | 85~95% | 85~93% | 85~92% | |
| Core Characteristics | Core Material | silicon steel sheet, | silicon steel sheet, | silicon steel sheet, |
| Structure & Thermal Management | Cooling Method | Air | Air | Air |
| Insulation Class | Class B / F | Class B / F | Class B / F | |
| Temperature Range | -40℃~+125℃ | -25℃~+85℃ | -40℃~+105℃ | |
| Certifications & Compliance | Safety Certifications | CQC、3C | UL、CE、VDE | UL、CE |
| Environmental Certifications | RoHS、REACH | RoHS、REACH | RoHS、REACH | |
Click here to download the specific information of encapsulated transformer!
Encapsulated TRANSFORMER（Mains Transformer).pdf
