Topaz 91091-32 Line Noise Suppressing Ultra-Isolator Isolation Transformer 120V

Topaz 91091-32 Line Noise Suppressing Ultra-Isolator Isolation Transformer 120V

The Topaz Electronics 91091-32 is a line noise suppressing Ultra-Isolator isolation transformer designed to filter high-frequency electrical noise from the AC power line. It accepts a standard 120V AC input and delivers a clean, noise-suppressed 120V output at up to 125 VA, providing sensitive equipment with cleaner power than the raw utility line typically supplies. The unit is a product of Topaz Electronics of San Diego, California, a recognized manufacturer of power-line isolation and conditioning equipment.

Specifications & What's Included

• Part Number: 91091-32
• Manufacturer: Topaz Electronics, San Diego, CA
• Input Voltage: 120V AC
• Output Voltage: 120V AC
• Power Rating: 125 VA
• Frequency: 50/60 Hz
• Interwinding Capacitance: 0.0005 pF (per label)
• Input: Hardwired NEMA 5-15P power cord
• Output: Dual NEMA 5-15R receptacles (standard 3-prong outlets)
• Form Factor: Desktop/benchtop with side mounting ears
• Enclosure: Gray/beige metal housing
• Included: Unit with attached power cord only — no additional accessories

Applications

Topaz Ultra-Isolator transformers are used wherever electrically sensitive equipment needs protection from line-borne noise, transients, and interference. They are commonly placed between the AC wall outlet and precision instruments such as laboratory test equipment, audio/video gear, medical instrumentation, computer workstations, and scientific apparatus. The isolation transformer's extremely low interwinding capacitance (0.0005 pF on this model) is what sets Topaz Ultra-Isolators apart from ordinary isolation transformers — it provides superior common-mode noise rejection without the high capacitance leakage path that limits standard units. Topaz built a strong reputation in the 1970s through 1990s supplying these units to hospital, laboratory, and industrial settings where power-line cleanliness is critical. These transformers remain in use today as cost-effective power conditioning solutions in legacy and precision instrument installations.