Switchable AC Transformer 105V 115V 125V Output 115VAC Input Bench Panel Mount

Switchable AC Transformer 105V 115V 125V Output 115VAC Input Bench Panel Mount

This is a single-phase AC power transformer with a three-position rotary selector switch that sets the output voltage to 105V, 115V, or 125V. The input is 115VAC via a hardwired cord with a standard 2-prong AC plug. An AC outlet receptacle on the front panel provides the switched output directly to connected equipment. A printed label on the enclosure reads "REMOVE PLUG BEFORE SWITCHING" — the output voltage must only be changed while the unit is unplugged. The transformer is housed in a gray steel enclosure with integral mounting feet for bench or panel installation.

Specifications & What's Included

• Type: Switchable output AC transformer
• Input voltage: 115VAC
• Output voltage: Selectable — 105V, 115V, or 125V
• Voltage selection: Front-mounted rotary switch (3 positions)
• Output connection: Front-panel AC outlet receptacle
• Input connection: Hardwired AC cord with 2-prong plug
• Phase: Single phase
• Enclosure: Gray steel chassis with integral mounting flanges/feet
• Mounting: Bench or panel mount
• Brand/model: Not identifiable — manufacturer label has been painted over
• kVA/wattage rating: Not legible from available photos or data
• Included: Transformer unit only — no additional cables or accessories

Applications

Switchable output transformers like this are used in laboratory, industrial, and electronics bench settings where equipment must be powered at a voltage slightly above or below the nominal 115VAC line to compensate for local line voltage variations or to meet specific equipment operating requirements. The selectable 105V/115V/125V output allows a technician to "boost" or "buck" the supplied voltage within a narrow range — a practical solution for older instruments, audio equipment, and industrial controls that specify a precise supply voltage or that were designed for slightly different regional line standards. The front-mounted AC receptacle makes this a self-contained power conditioning unit: plug the transformer into the wall, select the desired output voltage, and plug the load device into the front outlet. This style of compact, box-type transformer was widely used from the mid-20th century onward in electronics service shops, broadcast facilities, and industrial maintenance environments.