Energy » Transformers » Isolation Transformers » HPS

Search By Model

Search By Country

Building Filters

4

Used HPS Isolation Transformers

  • HPS NMK045KB

    HPS NMK045KB

    • Manufacturer: HPS

    HPS 45 KVA 3-phase transformer, model NMK045KB, with GE safety switch. Input: 480V, Output: 208Y/120V, 60Hz frequency, and 150°C temperature rise. Aluminum winding, ventilated, NEMA 3R, 370lb. Pre-owned. Hammond ...

    $1,450 USD
    Louisville, KY
  • Trusted Seller
    HPS DM027KK 27 KVA 3-PHASE

    HPS DM027KK 27 KVA 3-PHASE DRIVE ISOLATION TRANSFORMER T198740

    • Manufacturer: HPS
    • Phase type: Three-phase

    Warranty Information This is a used item, in good condition and includes a 30 day warranty.

    $850 USD
    El Paso, TX
  • Trusted Seller
    HPS DM051KK DRY TYPE DRIVE

    HPS DM051KK DRY TYPE DRIVE ISOLATION TRANSFORMER 51 KVA 480V DELTA TO 480Y/277V M3100

    • Manufacturer: HPS
    • Phase type: Three-phase

    Transformer in very good shape Weight: 420 LBS | Shipping: Calculated at Checkout | Model part number: DM051KK | Hp: 51 KVA | Voltage: H.V 480V Delta, L.V. 480Y/277V | Phase: 3 Phase

    $1,200 USD
    El Paso, TX
  • Trusted Seller
    HPS SG3A0075PP

    HPS SG3A0075PP

    • Manufacturer: HPS
    • Phase type: Three-phase

    Kva: 75 kVA | Primary voltage: 600 volts | Secondary voltage: 600/347 volts | Phase: 3-phase | Auto vs isolation: Isolation | Oil vs dry: Dry

    $2,879 USD
    British Columbia, Canada

Overview

Isolation transformers provide electrical separation between the supply and the load to reduce electrical noise, prevent ground loops, and improve personnel and equipment safety. Common in industrial and control applications, they come in dry or oil-filled designs, single- or three-phase, and a wide range of kVA ratings. They protect sensitive electronics and stabilize power for panels, drives, and mobile equipment charging.

FAQ

What should I consider when buying a used isolation transformer?

Check kVA rating, primary/secondary voltages, phase, impedance, insulation condition, nameplate details and test records. Verify oil condition for oil-filled units, look for corrosion or damage, and request recent ratio and insulation resistance tests.

How do I ensure the isolation transformer is shipped safely?

Use a carrier experienced with heavy electrical gear, secure lifting points and skids, drain oil if required and comply with hazmat rules for oil-filled units. Crate or brace the unit, label weight and center of gravity, and insure for transit.

What is the maintenance schedule for an isolation transformer?

Perform visual checks monthly, tighten connections and inspect bushings yearly, carry out insulation resistance and turns-ratio tests annually, do oil sampling and treatment per manufacturer intervals, and use thermography for load checks.