Pad Mounted Distribution Transformer, 100/200/250/500/1000 kVA

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ATO pad mounted distribution transformers are available in single-phase and three-phase models. Single-phase units feature 25–250 kVA ratings, 7.62–19.92 kV primary voltage, and 120–240 V output. Three-phase models offer 75–2500 kVA capacities with 120/240/480 V. Both deliver low loss, low noise, and reliable outdoor performance.Custom configurations can be provided for your project demands.

Phase *
Capacity
Primary Voltage Rating
Secondary Voltage Rating
Required Certifications

SKU: ATO-DT-STPM

30-day Returns

Delivery date: 10-20 days

Overview

Note: Capacity, primary voltage, secondary voltage, and certification requirements are customizable. Please contact us for more details and pricing.

Available in single-phase and three-phase configurations, ATO pad mounted distribution transformers combine a compact sealed design, low-loss efficiency, quiet operation, flexible distribution options, and comprehensive protection features. With capacities from 25 kVA to 2500 kVA, they provide safe, reliable, and cost-effective power distribution for utility, commercial, and industrial applications. Customize your distribution transformer right now.

Technical Specifications

Single phase pad mounted distribution transformer

Typical Dimensions and Weights (C.R.G.O Core)

Rating (kVA)	HV (kV)	Tap (%)	LV (V)	Loss (W)		Dimension (mm)			Weight (kg)
Rating (kVA)	HV (kV)	Tap (%)	LV (V)	No Load	Full Load	A	B	C	Oil Weight	Total Weight
25	7.62	±2*2.5%	120–240	115	420	680	830	950	175	405
37.5				130	520	700	850	980	190	423
50				150	660	730	875	1000	205	459
75				190	980	800	895	1030	245	557
100				245	1230	840	950	1105	317	697
167				380	1560	910	990	1185	389	925
250				550	2000	975	1090	1215	462	1215

25	19.92	±2*2.5%	120–240	115	420	680	830	950	175	405
37.5				130	520	700	850	980	190	423
50				150	660	730	875	1000	204	464
75				190	980	800	895	1030	243	562
100				245	1230	840	950	1105	311	694
167				380	1560	910	990	1185	386	930
250				550	2000	975	1090	1215	462	1215

Note: The above date is only subject to our standard design, special reqirement can be customized.
3 Phase Pad Mounted Distribution Transformer

Typical Dimensions and Weights (C.R.G.O Core)

Rating (kVA)	HV (kV)	Taps (%)	LV (V)	Loss (W)		Dimension (mm)			Weight (kg)
Rating (kVA)	HV (kV)	Taps (%)	LV (V)	No Load	Full Load	A	B	C	Oil Weight	Total Weight
75	12.47	±2*2.5%	480/277 208/120	240	1230	1480	1550	1575	180	700
112.5				320	1730	1530	1560	1585	205	905
150				410	2230	1550	1565	1595	220	1005
225				420	3150	1660	1585	1600	240	1295
300				680	3850	1680	1600	1600	300	1505
500				980	5380	1690	1605	1600	350	2003
750				990	7600	1735	1700	1650	605	2791
1000				1180	10500	1800	1700	1650	660	3335
1500				1680	15000	1800	1700	1730	780	4250
2000				2000	19200	1850	1750	1730	880	4630
2500				2550	25800	1850	1750	1800	1500	4950

Note: The above date is only subject to our standard design, special reqirement can be customized.

Applications

ATO pad mounted distribution transformers serve residential neighborhoods, commercial developments, industrial facilities, utility networks, and rural agricultural areas, delivering reliable, weather-resistant power distribution across diverse outdoor environments.

Pad mounted distribution transformer applications

Tips: How is a pad mounted transformer different from a conventional transformer?

A pad mounted distribution Transformer is a ground-mounted, fully enclosed electrical transformer designed for underground distribution systems. It is typically installed on a concrete pad and used in residential, commercial, and industrial power networks to step down medium voltage to usable low voltage levels.
Compared with conventional transformers (such as pole-mounted or open-type oil-immersed transformers), a pad mounted transformer has several key differences. It features a sealed metal enclosure, which protects all live components and eliminates direct exposure, making it much safer for installation in public or accessible areas. It also uses underground cable connections instead of overhead lines, resulting in a cleaner and more compact power distribution layout.
In addition, pad mounted transformers offer enhanced safety, lower noise levels, and improved environmental protection, while conventional transformers are often more exposed and require higher installation clearance. As a result, pad mounted units are widely used in urban distribution networks where safety, aesthetics, and reliability are critical.

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