Larson 30KVA Power Distribution System - 480V to 208Y/120V - 3PH - (4) 30A 480V (12) 40A 277V (2) 20A 120V

Larson ElectronicsSKU: PL3-MGS-4X480.30A-12X277.20A-30KVA-2X120.20A

Sale price$36,719.99


PuriLite suggests you place an order directly with us for large Larson orders due to the potential customization requirements. Please call us at 1-844-787-5483 to place your order. If you prefer to place your order online, a PuriLite agent will be in touch with you to discuss any custom options.
This unit is Made In USA - Manufactured in Texas
The Larson Electronics MGS-4X480.30A-12X277.20A-30KVA-2X120.20A power distribution substation converts 480V AC three phase electrical current into three phase 208Y/120V AC. This unit provides operators the ability to safely tap into and distribute 480V AC power from a variety of sources including generators and direct grid power.
The MGS-4X480.30A-12X277.20A-30KVA-2X120.20A portable power distribution system gives operators the ability to power their 480 volt, 277 volt and 120 volt equipment from a single system. On the primary side, operators connect 480 volt line-in power via cam-lock inputs to four M35 P29059-M1.22 480V receptacles for 480V equipment and to twelve M35 P29030-M1.22 277V receptacles for 277V equipment. On the secondary side, operators connect to two GFCI duplex 120V receptacles for 120V equipment. Operators may add additional outlets via three boxes with blank covers.
Customer provided cam-lock connectors bring 480V three phase power to the NEMA 3R 200-amp, 480/277V three phase primary MLO panel, which contains four 30-amp, 480V breakers protecting four M35 P29059-M1.22 480V receptacles, and twelve 40-amp, 277V breakers protecting twelve M35 P29030-M1.22 277V receptacles. The 30 KVA transformer converts 480V three phase power to 208Y/120V three phase and passes the current to the secondary panel. The secondary side of the transformer feeds a NEMA 3R 125-amp, 208Y/120V three phase secondary MLO panel. This secondary panel contains two 20-amp, 120V breakers protecting two GFCI duplex 120V receptacles.
Protective Construction:
Unlike many portable power distribution boxes made of plastic and utilizing thin gauge, low grade metals in their construction, this unit is designed for serious use and is ruggedly constructed to withstand demanding conditions and heavy duty industrial applications. The transformer and load assembly is mounted on a 3/16" thick carbon steel mounting platform and the load center/distribution assembly is mounted to the standard 2" x 2" x 1/8" square carbon steel tubing frame, resulting in an extremely stable, durable and well protected power distribution platform. This model is equipped with forklift skid pockets, locking casters, and a top located lifting eyelet which allows easy lifting with cable or chain hooks. This can be replaced for an additional cost with stainless steel, hot dip galvanized steel, or aluminum depending on the customer’s needs. Larger units are available upon request and can be equipped with skids or trailer mounted.
Larson Electronics is a UL 1640 panel shop and certified to build portable power distribution systems. All units are built in accordance to NFPA 70 (National Electric Code) and certified to UL 1640. All equipment is NEMA 3R rated for indoor and outdoor use and provide a degree of protection against dirt, water, and ice. NEMA 4 and NEMA 4X equipment can be equipped upon request.
Transformer is grounded to the frame and we provide a grounding lug on the frame for the earth ground. ~Please check all motor loads for dual rated motors that will work 208 or 240.~
This power distribution system is ideal for indoor or outdoor use and applications including but not limited to, construction sites, plant maintenance, plant turnarounds, shows, exhibits, and shipyard operations. These power distribution systems are popularly used in applications where external power sources are often necessary. We also offer class rated transformers for use within explosion proof and hazardous location environments.
Larson Electronics is a manufacturer and as such can build portable transformer systems to your Specifications. Although we carry several models of power distribution transformers, we can deliver custom ordered units almost as quickly as our prebuilt units. If this model does not meet your needs, please contact us at 1-844-787-5483 or
to discuss your specific requirements.

Line-in: 600V/400A Cam-lock Inputs
Line-in Cord Cap: -
Primary Voltage: 480/277V 3PH
Primary Panel: 480/277V 200A MLO N3R
Primary Breakers: (12) 40A, (4) 30A
Primary Receptacles: (4) M35 P29059-M1.22 [480V], (12) M35 P29030-M1.22 [277V]
Primary Protection: -
Transformer: 30KVA 480V 3PH to 208Y/120V 3PH
Secondary Panel: 208Y/120V 3PH 125A MLO N3R
Secondary Breakers: (2) 20A
Secondary Receptacles: (2) GFCI Duplex [120V]
Secondary Protection: GFCI
Form Factor: Square Tube Frame, Skid Pockets, Top Pick Eye & Locking 8” Locking Casters
Frame Materials: Powder Coated Steel Frame
Dimensions: 34” X 44” X 58”
Weight: 400 lbs

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