EM250S12AC 250W Outdoor Magnetic 12VAC Transformer

EM250S12AC 250W Outdoor Magnetic 12VAC Transformer

The EM250S12AC is a 250W outdoor magnetic transformer / LED AC driver designed to supply stable 12VAC power to compatible low voltage lighting loads. Its encapsulated transformer is housed in a black powder-coated NEMA 3R steel enclosure for protected outdoor installations.

Why Choose the EM250S12AC?

✔ 250W Single-Circuit Output
Delivers up to 250W on a single 12VAC circuit for compatible low voltage lighting systems.

✔ Outdoor NEMA 3R Enclosure
Black powder-coated steel housing is designed for protected outdoor power applications.

✔ Integrated Circuit Protection
Includes manually reset primary and secondary breakers for transformer protection.

✔ 93% Efficiency
Manufacturer-rated efficiency supports dependable power delivery at full load.

Electrical Specifications

• Input Voltage: 120V 60Hz
• Max. Input Current: 2A at full load
• Output Voltage - No Load: 12.7VAC
• Output Voltage - Fully Loaded: 11.5VAC
• Max. Total Wattage: 250W
• Max. Output Current: 20.8A
• Efficiency: 93%

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 250W 12VAC outdoor magnetic transformer

Choose the EM250S12AC when a project requires a 250W 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 250W 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 EM250S12AC?
This 250W 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 250W capacity and 20.8A output-current limit.

Is the EM250S12AC dimmable?
Dimming is not listed as a feature in the supplied product data. Confirm dimmer compatibility in the EMCOD specification sheet before designing a dimming system.

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