How long does delivery take?

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

Are samples available and how are they charged?

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

What causes transformer failure and is there a warranty?

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

Ei41 Ei48 Ei57 Ei66 Ei Low Frequency Encapsulated PCB Mount Transformer

Name: Ei41 Ei48 Ei57 Ei66 Ei Low Frequency Encapsulated PCB Mount Transformer
Brand: Hangzhou Udwells Technology Co., Ltd.
SKU: 2229886475

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: Full customization available including EI/Toroidal types, installation methods, and operating temperatures.

High-Quality Materials: Uses new high-grade silicon steel sheets (H18/H14) and 100% pure copper wire for superior performance.

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

EMI Shielding Option: Optional copper foil shielding layer between coils to suppress high interference for audio and instruments.

Flexible Installation: Supports vertical, horizontal, with base, or with cover installation methods to fit various needs.

Sample Availability: Samples provided for serious customers with fee refundable upon bulk order placement.

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: ≤4.46h

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 production?

Please provide Input Voltage, 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 interference but is larger and costlier. EI is smaller, lighter, cheaper, and easier to maintain, suitable for general industrial use.

Q:What is the purpose of a shielding layer?

A copper foil shielding layer between primary and secondary coils suppresses high interference, enhancing EMI resistance, essential for audio and measuring instruments.

Q:How do you ensure quality and service life?

We use high-grade materials, VPI process, and conduct 100% factory tests including Hi-Pot, inter-winding, load, and no-load current tests.

Q:What is the MOQ and how is pricing determined?

MOQ depends on customization (100pcs for standard, 500-1000pcs for custom). Price increases with power, material complexity, and process difficulty.