Square D 250SV43B Buck Boost Transformer 0.25 Kva

Product Description

The SQUARE D 250SV43B is a single-phase buck boost transformer rated at 0.25 kVA, designed to make small voltage corrections in AC distribution circuits. It accepts 120 x 240 input volts and delivers 12/24 output volts at 60 Hz, allowing electricians to raise or lower line voltage by a fixed increment without full isolation. The unit carries a NEMA 3R enclosure rating, meaning it is suitable for both indoor and outdoor installations where exposure to falling rain or sleet is a concern. RoHS compliance confirms the unit meets hazardous-substance restrictions. This transformer is a standard tool for commercial and light industrial electrical work where voltage drop or overvoltage conditions must be corrected.

Buck boost transformers of this type are commonly deployed in commercial buildings, light industrial facilities, and mechanical rooms where motors, HVAC equipment, or lighting loads require a voltage correction of a few percent. The NEMA 3R rating makes the 250SV43B an appropriate choice for outdoor disconnect panels, rooftop equipment hookups, and covered exterior installations. Licensed electricians and electrical contractors are the primary installers. The compact footprint and self-contained enclosure support straightforward panel or wall mounting in tight mechanical spaces.

Key Features

• 0.25 kVA power rating suitable for small voltage-correction loads
• 120 x 240 input voltage with 12/24 output voltage for flexible buck or boost wiring configurations
• Single-phase, 60 Hz operation
• NEMA 3R rated enclosure for indoor and outdoor use
• RoHS compliant construction

Compatibility

Designed as an OEM-style replacement and general-use buck boost transformer for single-phase 60 Hz electrical distribution systems requiring small voltage corrections.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC). Disconnect and lock out all power to the circuit before making any wiring connections to the transformer. Verify input and output voltage requirements before selecting a buck or boost wiring configuration, and confirm the connected load does not exceed the 0.25 kVA rating. The NEMA 3R enclosure must be mounted with the conduit openings oriented to prevent water ingress per the manufacturer and code requirements.