How long does delivery take?

Standard products take 10-15 working days. New customizations require an additional 5-7 days for samples. Large orders may take 15-30 days.

Can you provide samples and how are they charged?

Samples are available for serious customers. A fee is usually required but can be refunded or deducted after a bulk order. Sample lead time is 3-5 days.

What are common reasons for transformer failure and do you offer a warranty?

Failures are often due to overload, short circuits, or harsh environments. We provide a 1-year warranty covering free repair or replacement for quality issues.

Ei30 400V 12V Encapsulated Power Electric PCB Mounting Transformer

Name: Ei30 400V 12V Encapsulated Power Electric PCB Mounting Transformer
Brand: Hangzhou Udwells Technology Co., Ltd.
SKU: 2229784075

Zhejiang, ChinaHangzhou Udwells Technology Co., Ltd.

US$0.50-1.50

500 Pieces

Product profile

Customization

Available

Application

Power, Electronic, Instrument, Lighting, Rectifier, Audio

Phase

Single

Model NO.

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

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

Key features

Customizable Design: Offers full customization including EI/Toroidal types, vertical/horizontal installation, and base/cover options.

High-Quality Materials: Constructed with new high-grade silicon steel sheets (H18/H14) and 100% pure copper wire.

Advanced Insulation Process: Utilizes Vacuum Impregnation (VPI) for superior moisture resistance, shock absorption, and insulation strength.

Comprehensive Quality Testing: Undergoes 100% factory testing including Hi-Pot, inter-winding, load, and no-load current tests.

EMI Shielding Option: Available shielding layers (copper foil) effectively suppress high-frequency interference for audio and instruments.

1-Year Warranty Coverage: Provides 1-year warranty with free repair or replacement for verified quality issues.

ISO9001 Certified: Manufacturing process and quality management certified under ISO9001 standards.

Company profile

High Repeat Buyers ChoiceFast DeliveryPrivate MoldQuality Assurance

Hangzhou Udwells Technology Co., Ltd.

Zhejiang, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 3 Years CertifiedNearest Port: Shanghai Port, Ningbo PortAverage Response Time: ≤4.07h

AI-Powered supplier vetting

SummaryHANGZHOU UDWELLS TECHNOLOGY CO. Ltd. was founded in 2008 and reports a self-built plant exceeding 15,000 square meters, more than 10 production lines, Europe as a primary export market, and peak-season order fulfillment within 15 working days. It provides multiple customization options, ODM services, and has launched new products within the past year. The supplier also reports OEM service for well-known brands and quality assurance in its quality-control processes. However, no R&D audit documentation, SDK, approved-supplier list, written service procedures, corrective/preventive-action procedures, or complaint-handling procedures were available. Overseas warehouses, showrooms, agents or branches, and offline trade-show participation were not reported. Financial information is insufficient for a credibility judgment, and sustainability-related fire-drill and environmental-assessment status is unknown.

After-Sales capabilityTechnology engineers are responsible for technical support during production and after-sales service, but the supplier has no written procedures or records for effective service assessment, corrective and preventive actions, or customer complaint handling. It also has no overseas warehouse, showroom, agent, or branch, limiting evidence of structured or localized after-sales support.

R&D capabilityThe supplier reports new products within the past year, ODM capability, customization-related R&D services, and use of PS and CAD. It also reports OEM service for well-known brands. Countervailing evidence includes only one year of total R&D engineer experience, no available SDK, and no R&D design-input, output, review, verification, or validation documents for audit.

Production capacityThe supplier reports a self-built plant exceeding 15,000 square meters, more than 10 production lines, complete testing facilities, and peak-season order fulfillment within 15 working days. These explicit operating-scale and delivery statements support a production-capability advantage, although the number of quality-control staff is listed as unavailable.

Customization capabilityThe supplier explicitly offers customization from samples, customization from designs, full customization, flexible customization, and minor customization. It also provides ODM services, demonstrating broad stated customization coverage.

Client casesThe supplier states that it provides OEM services for well-known brands and identifies Europe as a primary export market. These statements indicate some brand and export experience, but no customer names, project details, order references, or verifiable case documentation are provided.

Product Q&A

Q:What specifications are needed for a 220V to 12V step down transformer?

Please provide Input Voltage (with fluctuation range), Output Voltage & Current, Rated Power (VA/W), Frequency (50Hz/60Hz), Construction type (Toroidal/EI/R), Installation method, and Insulation Grade.

Q:What is the difference between Toroidal and EI transformers?

Toroidal offers high efficiency, low leakage, and low volume but is costlier. EI is smaller, lighter, cheaper, and easier to maintain, suitable for general industrial use.

Q:Is there a shielding layer in transformers and what is it for?

Yes, a copper foil shielding layer can be added between primary and secondary coils to suppress high interference and enhance EMI resistance, essential for audio and measuring instruments.

Q:How do you ensure transformer quality and service life?

We use high-grade silicon steel and pure copper, apply VPI process, and conduct 100% factory tests including Hi-Pot, inter-winding, and load tests.

Q:What determines the price and minimum order quantity (MOQ)?

Price depends on power, materials, and complexity. MOQ is lower for standard specs (e.g., 100pcs) but higher for custom specs requiring mold opening (e.g., 500-1000pcs).