Single-Phase Padmount Transformer
Single-phase tamper-resistant padmount transformers for residential subdivision loops, streetlighting, and light commercial underground distribution. 10 kVA to 500 kVA.
Single-Phase Underground Distribution
Single-phase padmount transformers distribute power from underground medium-voltage feeders to residential subdivisions, rural residential services, and light commercial applications. Their compact, tamper-resistant design suits locations in front yards, easements, and public rights-of-way where overhead pole-mounted construction is not permitted.
- Compact footprint for residential right-of-way installation
- Standard 120/240 V or custom secondary voltage
- Series-multiple or additive-subtractive winding options
- Radial or loop-feed high-voltage configuration
- Conventional or current-limiting fuse options
- Integral streetlighting tap available
What's Included
- NEMA 3R-equivalent tamper-resistant enclosure
- Single lockable HV/LV compartment with hinged cover
- Mineral oil or FR3 natural ester fluid options
- Copper winding conductor (standard)
- Standard voltage taps ±5% and ±2.5%
- Pressure relief device on tank
- Stainless steel hardware and locking provisions
- Ground boss and arrester provision
- +FR3 natural ester fluid (fire-safe and biodegradable)
- +Streetlighting secondary tap (120 V or 240 V)
- +Current-limiting fuse for close-in fault protection
- +Stainless steel enclosure for corrosive environments
- +Extended secondary terminal options
- +Custom tank colour and nameplate language
- +PME (protective multiple earth) secondary arrangement
- +Low-loss amorphous core for energy efficiency
Full Specifications
| Parameter | Value |
|---|---|
| kVA Range | 10 kVA – 500 kVA |
| Primary Voltage (HV) | 2.4 kV – 34.5 kV |
| Secondary Voltage (LV) | 120/240 V (standard), custom available |
| Winding Configuration | Single-phase, 2-winding |
| Cooling Class | ONAN (natural oil / natural air) |
| Insulating Fluid | Mineral oil or FR3 natural ester |
| Winding Material | Copper |
| HV Taps | 2 × 5% FCAN, 2 × 2.5% FCBN (standard) |
| Temperature Rise | 65°C (standard) |
| Enclosure | Tamper-resistant painted steel |
| Primary Standard | ANSI C57.12.25 / IEEE C57.12.00 |
| Canadian Certification | CSA C88 / CSA C22.2 |
| Frequency | 60 Hz |
Built to Standard
Where It's Used
- Residential subdivision underground loops
- Rural residential underground services
- Streetlighting distribution circuits
- Light commercial underground services
- Mobile home parks and recreational vehicle parks
- Agricultural and farm service connections
From design and specification through factory testing, commissioning, and ongoing maintenance — Candron delivers at every phase.
- Engineering drawings and coordination studies
- Factory acceptance testing (FAT) with full reports
- Site commissioning and protection settings
- Spare parts, training, and maintenance support
Common Questions
Series-multiple refers to a single-phase transformer with two secondary coils that can be connected in series (240 V) or parallel (120 V) to provide dual-voltage capability. Additive and subtractive refer to the standard polarity conventions for single-phase transformer connections, which determine the phase relationship of the secondary with respect to the primary.
Yes. A dedicated secondary lighting tap (typically 120 V or 240 V, rated separately from the main load) can be provided on single-phase padmount transformers to serve streetlighting loads on the same circuit without a separate distribution transformer.
Lead times vary based on kVA rating, voltage configuration, and order volume. Contact our engineering team for a project-specific lead time estimate. We maintain detailed availability information and can often accommodate tight project timelines.
Ready to Spec
Your Project?
Our engineering team responds with specs, lead times, and pricing the same day. Tell us what you need:
- Required kVA rating
- Primary voltage and system grounding
- Secondary voltage and connection type
- Radial or loop-feed HV configuration
- Streetlighting tap requirements (if any)
- Fluid preference (mineral oil or FR3)
- Site location and environmental conditions
- Applicable standards (ANSI or CSA)
Send us your project details and we'll respond with a price, lead time, and any clarifying questions — typically within a few hours.
Request a Quote →Or call us directly