EM300S12AC 300W Dimmable Outdoor Magnetic 12VAC Transformer

EM300S12AC 300W Dimmable Outdoor Magnetic 12VAC Transformer

The EM300S12AC is a 300W phase-cut dimmable magnetic AC transformer / LED driver for compatible 12VAC low voltage lighting systems. It combines high-capacity power delivery with an outdoor black powder-coated steel enclosure and integrated circuit protection.

Why Choose the EM300S12AC?

✔ 300W 12VAC Capacity
Supplies up to 300W on a single 12VAC circuit for larger compatible lighting systems.

✔ Phase-Cut Dimmable
Designed for compatible phase-cut dimming applications.

✔ Outdoor NEMA 3R Enclosure
Powder-coated steel housing protects the encapsulated transformer in outdoor installations.

✔ 93% Efficiency
High manufacturer-rated efficiency supports stable performance at full load.

Electrical Specifications

• Input Voltage: 120V 60Hz
• Max. Input Current: 3A at full load
• Output Voltage - No Load: 12.7VAC
• Output Voltage - Fully Loaded: 11.5VAC
• Max. Total Wattage: 300W
• Max. Output Current: 25A
• Efficiency: 93%
• Dimming: Phase-cut dimmable

Construction & Certification

• Enclosure: Black powder-coated steel, outdoor NEMA 3R
• Transformer Construction: Encapsulated magnetic transformer with separated primary and secondary windings
• Certification: Conforms to UL 2108; certified to CSA C22.2 No. 250.0
• Primary Breaker: 5A manually reset
• Secondary Breaker: 25A manually reset
• Dimensions: 8 × 4.1 × 3.24 in

How to Select the 300W 12VAC outdoor magnetic transformer

Choose the EM300S12AC when a project requires a 300W 12VAC outdoor magnetic transformer and the available supply matches 120V 60Hz. Confirm that every connected fixture accepts 12VAC and that the planned load fits the transformer’s circuit configuration. Its black powder-coated NEMA 3R steel enclosure is intended for outdoor transformer installations.

This is a single-circuit model, so all connected fixture wattage counts toward the listed 300W maximum. The specifications show 12.7VAC at no load and 11.5VAC at full load, giving installers a reference for expected output as the connected load changes. Final transformer location, wiring, circuit protection and code compliance should be reviewed by a qualified installer before the system is energized.

Frequently Asked Questions

What lighting systems can use the EM300S12AC?
This 300W 12VAC outdoor magnetic transformer is intended for compatible low-voltage landscape or architectural lighting that accepts 12VAC power. The connected load must stay within the listed 300W capacity and 25A output-current limit.

Is the EM300S12AC dimmable?
Yes. The product data lists Phase-cut dimmable. The wall control, transformer and connected fixtures must all be compatible with that dimming method.

Can this transformer be installed outdoors?
Yes. Its black powder-coated NEMA 3R steel enclosure is specified for outdoor transformer installations. Final placement and wiring must still follow the product instructions and applicable electrical requirements.

Compare voltage, capacity, circuit and enclosure options in our low-voltage landscape lighting transformer collection.

Official EMCOD Specification Sheet: Download PDF