How long does the delivery take?

Standard/small orders: 10-15 working days. New customizations require an additional 5-7 days for sample confirmation. Large orders may take 15-30 days. Raw material price fluctuations may also affect timing.

Can samples be provided and how are they charged?

Yes, samples are supported for serious customers. A sample fee is usually required but can be refunded or deducted after placing a bulk order. Sample lead time is typically 3-5 days.

What are the possible reasons for transformer failure and is there a warranty?

Common reasons include overload, short circuits, and harsh environments causing insulation aging. We provide a 1-year warranty. Quality issues will be repaired or replaced for free.

Ei Low Frequency 60Hz 200V Step Down Transformer 240V 220V 110V 18V 21V 24V 30V

Name: Ei Low Frequency 60Hz 200V Step Down Transformer 240V 220V 110V 18V 21V 24V 30V
Brand: Hangzhou Udwells Technology Co., Ltd.
SKU: 2237949625

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

Wide Voltage Range: Supports input 240V/220V/110V and multiple output voltages including 18V, 21V, 24V, 30V.

High Power Capacity: Available in various models ranging from 0.3VA up to 2000VA for diverse applications.

Customizable Design: Offers flexible customization for type, installation method, and operating temperature ranges.

Premium Materials: Constructed with new high-grade silicon steel sheets and 100% pure copper wire.

100% Quality Testing: Each unit undergoes Hi-Pot, load, and no-load tests before leaving the factory.

Low Frequency Efficiency: Designed for 60Hz low frequency applications with EI core-type structure.

EMI Shielding Option: Optional copper foil shielding layer effectively suppresses electromagnetic interference.

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: ≤5.74h

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 and Current (or Power), Rated Power (VA/W), Frequency (50Hz/60Hz), Construction type (EI/Toroidal), Installation method, and Insulation Grade.

Q:Should I choose a Toroidal or EI transformer?

Toroidal transformers offer higher efficiency, less leakage magnetism, and are ideal for high-end audio/precision instruments but are costlier. EI transformers are smaller, lighter, more cost-effective, and suitable for general industrial equipment.

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

Yes, a copper foil shielding layer can be specified between primary and secondary coils. It is grounded to suppress high-frequency interference and enhance EMI resistance, essential for audio and measuring instruments.

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

We use new high-grade silicon steel sheets, 100% pure copper wire, and Class B+ insulation. We employ VPI process for moisture/shock resistance and conduct 100% factory tests including Hi-Pot, load, and no-load tests.

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

Price and MOQ depend on specifications and quantity. Standard specs may have an MOQ of 100pcs, while fully custom specs requiring molds may have an MOQ of 500-1000pcs. Larger quantities lower the unit price.