315kVA Pad Mounted Transformer 12.47kV to 480V Three Phase DOE & ANSI Certified

The 315 kVA Three-Phase Pad-Mounted Transformer (American-style compartmental pad-mount) is a compact, dead-front, oil-immersed distribution transformer designed for underground power distribution systems in the United States. Perfect for residential subdivisions, commercial buildings, industrial parks, data centers, and EV charging stations.

• Rated Capacity: 315 kVA
• Primary Voltage: 12.47 kV Delta
• Secondary Voltage: 480 V Wye (480Y/277 V)
• Vector Group: Dyn11
• Impedance: Approx. 4.75% (range 4.5%–5.75%)
• Losses: Meets or exceeds DOE 2016 efficiency standards
• Average Winding Temperature Rise: 65°C
• Cooling Type: ONAN
• Frequency: 60 Hz
• Tap Changer: ±2 × 2.5% (de-energized)
• BIL: 95 kV (HV), 30 kV (LV)

• Flip-top hood – 180° opening for easy access and maintenance
• Fully sealed dead-front construction – tamper-resistant, no exposed live parts
• Robust steel enclosure with high-quality powder coating (Munsell Green standard)
• Radial or Loop feed configuration available
• Dual fusing protection (Bay-O-Net + ELSP current-limiting fuses)
• Complies with ANSI/IEEE C57.12.28, C57.12.34, DOE 2016, UL/CSA standards

Customers frequently ask “Can you add XX?” – the following popular options directly affect pricing:

• Enclosure: Stainless steel tank base, cabinet, or full 304/316 stainless steel (excellent corrosion resistance for coastal or harsh environments)
• Fluid: Mineral oil or Envirotemp™ FR3 natural ester fluid (fire-resistant, biodegradable, higher flash point)
• Switching: 2-position or 4-position loadbreak switch (V-blade or T-blade)
• Tap Changer: Externally operable de-energized tap changer
• Fusing: Various Bay-O-Net + ELSP combinations or upgrade to Vacuum Fault Interrupter (VFI)
• Gauges & Valves: Pressure-vacuum gauge (with contacts), liquid level gauge, dial thermometer (with alarms), drain/sampling valve
• Grounding: Copper ground bus, additional ground pads, stainless steel hinges and pentahead bolts
• Color: Standard Munsell Green or custom colors (ANSI #61 Gray, etc.)
• Low Voltage: Molded case circuit breaker provisions, extra-hole spades (6, 8, 10, or more holes)
• Other: Surge arresters, Kirk-Key interlock, nitrogen blanket, stainless steel nameplate, parking stands, etc.

• 20+ years of manufacturing experience with strict quality control
• Full routine and type testing per ANSI/IEEE standards
• Fast lead time and proven U.S. market export expertise
• Standard 12-month warranty (extendable)

Custom configurations are welcome. Contact us for detailed drawings, test reports, and competitive pricing!