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Pole-Mounted Transformers

Single-phase and three-phase pole-mounted distribution transformers with CSP protection, 5–500 kVA, IEC and ANSI designs.

Pole-mounted distribution transformer on a rural overhead line

Pole-mounted distribution transformers

Pole-mounted transformers bring 11, 13.8, 22 or 33 kV overhead distribution down to 120/240 V, 230/400 V or 277/480 V at the point of use. MARS supplies single-phase units from 5 to 167 kVA and three-phase units from 25 to 500 kVA, in IEC and ANSI/IEEE C57.12.20 designs, with conventional or completely self-protected (CSP) construction including an internal fuse, secondary breaker and lightning arrester.

Options

  • Copper, aluminium or amorphous-core designs for lightly loaded rural feeders where no-load loss dominates.
  • Hermetically sealed corrugated tanks; polymer or porcelain bushings; two or four LV bushings; tap changer ±2 × 2.5 %.
  • Mounting: single-pole hangers, cluster or platform mounting; lugs to ANSI or IEC hole patterns.
  • Accessories: fuse cut-outs, surge arresters, drop-out mounting brackets.

See single-phase vs three-phase for rural electrification and a representative 11 kV rural configuration.

FAQ: Pole-Mounted Transformers

What is a CSP transformer?

A completely self-protected transformer includes an internal primary fuse, a secondary circuit breaker and a lightning arrester mounted on the tank, so no separate cut-out or arrester is needed on the pole. It simplifies installation and reduces outage time on rural feeders.

Single-phase or three-phase for a village?

Single-phase units are cheaper per kVA at small sizes and can be clustered later; three-phase units are needed where motors above about 5 kW, pumps or workshops are expected. Many utilities use single-phase for residential feeders and three-phase for commercial loads.

Do you supply ANSI 60 Hz pole transformers?

Yes — 7.2/12.47 kV, 7.97/13.8 kV and 19.9/34.5 kV single-phase and 13.8 / 34.5 kV three-phase units to IEEE C57.12.20 with 95–150 kV BIL, for Latin America, the Caribbean and the Philippines.

How heavy is a 100 kVA pole transformer?

A three-phase 100 kVA 11/0.4 kV unit weighs typically 500–650 kg oil-filled; a single-phase 50 kVA unit around 300 kg. Weights are stated on each product page and confirmed on the approval drawing for pole-loading checks.