EI Laminated Power Transformer, 10 W to 30 W, 110/220 V Primary to 12/24/48 V Secondary, Class B/F Insulation, EMI Metal Enclosure, Lead Wire Harness

1. Product Name

EI laminated power transformer for 110 V / 220 V AC mains. This designation covers a built-to-order series with a power range of 10 W to 30 W and secondary windings providing 12 V, 24 V, or 48 V AC output. The construction uses an EI laminated core, windings wound on a flame-retardant bobbin with interlayer insulation, vacuum impregnated, and enclosed in a metal housing with dual-flange mounting brackets.

Since power ratings are set by order, the same physical dimensions cover the entire series; windings, lead lengths, and connectors are all determined at the time of ordering. The material data presents the series as a single product family; no model numbers are assigned to individual power ratings, so ordering descriptions must include the power rating and voltage combination rather than a part number.

2. Construction and Materials

The magnetic circuit uses an EI laminated core, described in the data as low-loss laminations. The windings are wound on a molded bobbin with comb-style dividers for lead exits, wrapped with yellow insulating tape on the outer layer, and the entire assembly is vacuum impregnated to bond the winding layers firmly and enhance structural rigidity against displacement.

The insulation system is specified to Class B / Class F standards, and the bobbin is molded from V-0 flame-retardant material. The winding is enclosed in a metal housing that the supplier describes as providing both mechanical protection and EMI shielding, with the mounting brackets stamped from the same sheet metal. Close-ups in the catalog show the tape wrap layers and the comb dividers separating each lead exit.

The leads are soldered to plated terminal posts molded into the bobbin and gathered into a white multi-pin connector. Six insulated leads are visible in the photo: white, yellow, black, red, blue, and another red, with one lead printed with a 20 AWG marking. The data does not provide a wiring table, so the winding assignment of each lead must be referred to the drawing supplied with the order rather than this page.

The material contains four views of the same product, noting only that all dimensions are approximate and in millimeters. No dimension values are marked on the drawing, so length, width, and height dimensions are not published here, and the three dimension fields in the list are left blank.

3. Features

EI laminated core. Uses a laminated EI structure rather than a wound core, which is the traditional construction for power transformers in this power range.

Custom power rating per order. The 10 W to 30 W range is set through the winding configuration, so the same physical size can cover multiple power ratings, allowing one mounting position to serve the entire product family.

Voltage flexibility. 110 V or 220 V primary, with 12 V, 24 V, or 48 V secondary, selected at the time of ordering.

Class B / Class F insulation. Two insulation systems are offered, with the bobbin molded from V-0 flame-retardant material.

Vacuum-impregnated windings. Varnish impregnation under vacuum bonds the winding layers and reduces displacement under load, which the supplier states contributes to low-noise operation.

Terminal lead harness. Leads are soldered to terminal posts and routed to a white multi-pin connector, delivered as a semi-finished product ready for in-line assembly.

Bracket mounting. Dual-flange slotted mounting holes allow direct bolting to the chassis base plate or panel without additional clamps.

4. Advantages

One physical size, multiple power ratings. The same enclosure and brackets fit the entire 10 W to 30 W range, allowing the product family to share mounting positions and maintenance procedures.

Metal enclosure. The housing shields the winding and, according to the supplier, reduces electromagnetic interference for stable operation.

Temperature rise margin at this size. The supplier targets a temperature rise not exceeding 45 °C, leaving headroom for surrounding electronic components in sealed enclosures.

Efficiency target of at least 92%. This is particularly important for continuously operating transformers, where losses appear as heat buildup inside a closed enclosure rather than on the electricity meter.

Assembly cost. Compared to loose leads requiring termination at a terminal block, the plug-in terminal harness eliminates routing and soldering operations on the production line.

Serviceability. The plug-in connection allows transformer replacement without desoldering the harness from the circuit board.

5. Applications

The following uses are general application scenarios for EI power transformers of this size, not specific claims from the data.

Mains-to-low-voltage power rails for supplying control boards, relays, or displays from 110 V or 220 V AC mains while obtaining 12 V, 24 V, or 48 V output in the same enclosure.

Instrumentation and laboratory equipment for bench instruments and test fixtures requiring an isolated low-voltage supply, favoring a metal-enclosed product with short lead harnesses over bare open-frame transformers.

Industrial control cabinets in panel assembly scenarios where the transformer is bolted to the base plate and the secondary is connected via a plug rather than a terminal block.

Audio and small household appliances where low-noise power supplies and controlled magnetic field leakage are required, hence the metal enclosure and vacuum impregnation options.

Custom products for any application where voltage combinations, power ratings, lead lengths, or connectors are set by order rather than selected from catalog parts.

6. Specifications

The table below distinguishes between what is explicitly stated in the material and what is not. Values not published in the original data are marked as "Not stated" rather than filled with typical values, because the same physical size can accommodate windings with significantly different ratings across the 10 W to 30 W range.

6.1 Summary

6.2 Electrical Parameters

6.3 Windings and Insulation

6.4 Termination and Mounting

6.5 Quality and Compliance

7. Ordering

Please submit inquiries based on electrical requirements. A valid inquiry should include: rated power or secondary current, primary voltage, secondary voltage or tap configuration, required lead length and connector type, available space, and quantity per order and per delivery. With this information, we can confirm the core size, windings, harness, and pricing.

Regarding compliance: the material displays CCC, CE, RoHS, and UL marks, but no certificate numbers, issuing bodies, or test reports accompany them, so this page makes no compliance claims. If your target market requires a declaration, please request certificates for the specific standards. A marks panel alone cannot serve as proof of certification.

Brand / Manufacturer: ZXY, Shenzhen Zhixiangyuan Electronics Co., Ltd. http://www.zxycoil.com