GE 9T51B0125 Buck Boost Transformer 0.15 kVA 120/240V 16/32V 1Ph Type QB

GE 9T51B0125 Buck Boost Transformer 0.15 kVA 120/240V 16/32V 1Ph Type QB

The GE 9T51B0125 is a single-phase, dry-type buck boost transformer rated at 0.150 kVA, designed to make small adjustments to AC line voltage — typically raising or lowering it by a fixed amount rather than providing full voltage isolation. GE's Type QB series are compact, encapsulated units built for general-purpose electrical distribution applications where line voltage must be corrected up or down by a small increment.

Specifications & What's Included

• Manufacturer: GE Electrical Distribution & Control
• Catalog / Model Number: 9T51B0125
• Type: QB (Buck Boost Transformer)
• kVA Rating: 0.150 kVA (150 VA)
• Phase: Single Phase (1 PH)
• Frequency: 60 Hz
• Primary Voltage: 120V or 240V AC
• Secondary Voltage: 16V or 32V
• Max Autotransformer Voltage: 272V
• Max Autotransformer Current: 4.69 A
• Conductor Material: Copper (CU)
• Ambient Temperature Rating: 40°C
• Temperature Rise: 55°C
• System Temperature Class: 105°C
• Enclosure: Gray painted steel with mounting flanges
• Country of Origin: Mexico (assembled)
• UPC: 783173-00863
• Includes: Transformer unit in original sealed box

Applications

Buck boost transformers are widely used in commercial and light industrial electrical systems to correct small voltage discrepancies — for example, stepping 208V up to 240V, or trimming 240V down to 208V, to match the requirements of motors, HVAC equipment, lighting systems, or other loads. Because the GE 9T51B0125 has 16V and 32V secondary windings, it is most often wired as an autotransformer in series with the supply line, allowing a small voltage boost or buck without the cost or size of a full isolation transformer. The Type QB series from GE is a standard product in the electrical distribution industry, commonly specified by electricians and electrical contractors for voltage-correction work in commercial buildings, manufacturing facilities, and equipment installations where the available utility voltage does not exactly match the load's nameplate requirement. At 0.150 kVA, this is the smallest unit in the 9T51B series and is suited for small single-phase loads or control circuits.