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Used Isolation Transformers in California, USA

  • Trusted Seller
    HPS "3 KVA" Transformer

    HPS "3 KVA" Transformer

    • Manufacturer: HPS
    • Phase type: Single-phase

    HPS "3 KVA" Transformer Phase: 1 PHASE | Voltage: 115/230 | Load out period: December 29, 2025 (By Appointment Only) | Estimated dimensions: See photos and description | Estimated weight: 100 lbs | Load fee: 10.00

    Tracy, CA
  • Allen Bradley 1321-3TH118-BB 118 KVA

    Allen Bradley 1321-3TH118-BB 118 KVA 460V 460Y/266V Drive Isolation Transformer

    • Manufacturer: Allen-Bradley

    Up for sale is used Allen Bradley 118 KVA transformer, model 1321-3TH118-BB. Three phase dry type drive isolation transformer. HV: 460V LV: 460Y/266V. Please see pictures of tag for specification. Can be seen in ...

    $2,500 USD
    Santa Clarita, CA
  • Allen Bradley 1321-3TH175-BB 175 KVA

    Allen Bradley 1321-3TH175-BB 175 KVA 460V 460Y/266V Drive Isolation Transformer

    • Manufacturer: Allen-Bradley

    Up for sale is used Allen Bradley 175 KVA transformer, model 1321-3TH175-BB. Three phase dry type drive isolation transformer. HV: 460V LV: 460Y/266V. Please see pictures of tag for specification. Can be seen in ...

    $3,500 USD
    Santa Clarita, CA
  • Quick Tester Model 8505

    Quick Tester Model 8505

      The Quick Tester Model 8505 is a hand-held instrument for performing quick, basic integrity tests on all transformers and capacitors used by electrical utilities. The Model 8505 verifies transformer winding conti...

      Hayward, CA

    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.