44057 EI30X10.5 PCB TRANSFORMER MYRRA

44057 EI30X10.5 PCB TRANSFORMER MYRRA – 1.0VA $230text{V AC}$ to Dual $12text{V AC}$ Encapsulated Safety Transformer

The 44057 EI30X10.5 PCB TRANSFORMER MYRRA (part of Myrra’s 44000 Series EI 30-10.5 core range) is a compact, vacuum-encapsulated safety isolating transformer designed for direct printed circuit board (PCB) mounting. Rated for $1.0text{ VA}$ output with a $230text{V AC}$ primary input, the 44057 EI30X10.5 PCB TRANSFORMER MYRRA features dual independent $12text{V AC}$ secondary windings ( $2 times 12text{V AC}$ at $42text{ mA}$ each).

As shown in the product image, the transformer is housed in a durable, flame-retardant maroon epoxy resin casing. Its two-compartment bobbin construction and vacuum potting provide protection against moisture, dust, and mechanical vibration, while delivering up to $4text{ kV}$ isolation between primary and secondary circuits.

Key Features of the 44057 EI30X10.5 PCB TRANSFORMER MYRRA

Inherently Short-Circuit Proof: Engineered with thermal self-protection. Under continuous short-circuit or overload conditions, internal winding dynamics prevent hazardous overheating, eliminating the need for external secondary fuses.
Dual Secondary Windings ( $2 times 12text{V AC}$ ): Features two separate $12text{V}$ output windings ( $2 times 42text{ mA}$ ). They can be wired in series for $24text{V AC}$ ( $0.5text{ VA} + 0.5text{ VA}$ ) or in parallel for $12text{V AC}$ at higher current ( $84text{ mA}$ ).
High Electrical Isolation ( $4text{ kV}$ Dielectric Strength): Provides a $4000text{V AC}$ breakdown voltage barrier between primary and secondary circuits, safeguarding low-voltage logic from AC mains surges.
Vacuum Epoxy Encapsulation: Vacuum-cast in self-extinguishing plastic (UL 94 V-0 rated) for resistance to environmental degradation, mechanical shock, and moisture.
Class B Thermal Resilience ( $T70/B$ ): Operates reliably up to an ambient operating temperature of $70^circtext{C}$ ( $T70/B$ class rating).
International Regulatory Compliance: Complies with safety standards including EN 60950, EN 61558-2-6, UL 1585, CE, VDE, and UL certification marks.

Common Applications and Industrial Usage

The low power footprint, self-protection, and compact EI 30 profile of the 44057 EI30X10.5 PCB TRANSFORMER MYRRA make it suitable for continuous-duty auxiliary electronics:

Microcontroller & Logic Power Supplies: Step down $230text{V}$ AC mains to feed low-voltage DC linear regulators (e.g., $5text{V}$ or $12text{V}$ DC rails) on embedded logic boards.
Smart Home & HVAC Automation: Used in thermostats, HVAC control units, security alarm modules, and smart lighting boards.
Industrial Instrumentation: Powers sensor interfaces, auxiliary relay coils, low-power displays, and isolated measurement loops.
Standby Auxiliary Power: Serves as an always-on standby transformer for white goods, power meters, and consumer electronics.

Technical Specifications

The mechanical, electrical, and physical parameters for the 44057 EI30X10.5 PCB TRANSFORMER MYRRA include:

Parameter Specification	Technical Details & Operational Values
Component Classification	Encapsulated PCB Safety Isolating Transformer
Primary Target Keyword	44057 EI30X10.5 PCB TRANSFORMER MYRRA
Manufacturer / Part Reference	Myrra / `44057` (Series 44000 EI 30-10.5)
Nominal Power Rating	$1.0text{ VA}$
Primary Input Voltage	$230text{V AC}$ ( $50/60text{ Hz}$ ) — Terminals 1-5
Secondary Voltage Output	$2 times 12text{V AC}$ — Terminals 6-7 & 9-10
Secondary Rated Current	$2 times 42text{ mA}$
Protection Type	Inherently Short-Circuit Proof
Insulation Test Voltage	$4.0text{ kV}$ RMS ( $1text{ min}$ )
Thermal Class / Ambient	Class B / $T70/B$ ( $70^circtext{C}$ Max Ambient)
Flammability Rating	UL 94 V-0 Self-Extinguishing Case
Physical Dimensions ( $L times W times H$ )	$32.6text{ mm} times 27.6text{ mm} times 22.2text{ mm}$
Core Frame Size	EI 30 x 10.5
Weight	Approx. $70text{ g}text{ -- }71text{ g}$

Installation Guidelines and Best Practices

Safety Precaution: Always ensure the circuit board is fully discharged and disconnected from the $230text{V}$ AC mains supply before soldering or handling PCB components.

PCB Layout & Pinout: Observe correct pin configuration during PCB routing—Primary winding connects to Pins 1 and 5; Secondary 1 to Pins 6 and 7; Secondary 2 to Pins 9 and 10.

Creepage & Clearance: Maintain adequate high-voltage isolation gaps (minimum $6text{ mm}$ creepage) on the PCB copper layer between primary and secondary trace nets.

Soldering Technique: Follow standard wave-soldering or manual Through-Hole Technology (THT) soldering profiles to avoid excessive thermal stress on the terminal pins.

To review official safety isolating transformer specifications and EN 61558 testing standards, consult the official IEC 61558 Safety of Transformers Standard Directory.

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