Medical-grade power xformers have 4-kV isolation

The VPM Series of medical-grade toroidal isolation transformers offer 4 kV of isolation and come in low-voltage step-down configurations for simplified isolated power designs. They are rated from 25 VA to 10 kVA, 50/60 Hz.

Models are offered with outputs between 6 and 120 Vac and with various primary side taps. For a 50-VA device, the OD is 3.6 inches and the height is 1.58 inches. For a 250-VA device, the OD is 4.8 inches and the height is 2.4 inches. The transformer’s toroidal construction inherently reduces stray fields and provides high efficiency. VPM24-2080 50-VA model $36.09 ea/1,000.