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Grey metal NEMA 3R enclosure wall mounted transformer

SQUARE D

SQUARE D 50SV51A Electrical Box 50 VA 600V NEMA 3R

SKU CH-RGJT-7P7YN

Steps 600 V AC down to 120 V and 240 V at 50 VA in a NEMA 3R, IP54 copper-wound enclosure rated for outdoor wall mounting

  • TypePower Quality & Distribution
  • 50 VA step-down transformer delivers 120/240 V from 600 V input
  • NEMA 3R IP54 enclosure protects copper windings in outdoor wall-mount applications
  • 55 °C temperature rise rating ensures reliable continuous operation at 60 Hz
  • Dry-type design eliminates liquid coolant for simpler installation and maintenance
  • Square D brand backs industrial-grade power quality and distribution performance

50 VA Step-Down Transformer

The SQUARE D 50SV51A is a dry-type power distribution transformer rated at 50 VA with a 600 V AC input and dual 120 V or 240 V AC outputs. It suits industrial control panels, lighting circuits and similar low-voltage loads that require a NEMA 3R enclosure.

Sustained Load Behaviour

The copper-wound unit carries a 55 °C temperature rise rating at 60 Hz, meaning it maintains its 50 VA output continuously without exceeding insulation limits. Outdoor-rated construction with an IP54 enclosure sheds rain and splashing water while dissipating heat through natural convection.

NEMA 3R Interface Limits

The NEMA 3R rating permits wall mounting outdoors but does not protect against hose-directed water, submersion or heavy ice buildup. Installers must follow local code for conduit entry, grounding and clearances; the transformer itself provides no additional circuit protection or voltage regulation beyond the fixed step-down ratio.

Highlights

  • 50 VA step-down transformer delivers 120/240 V from 600 V input
  • NEMA 3R IP54 enclosure protects copper windings in outdoor wall-mount applications
  • 55 °C temperature rise rating ensures reliable continuous operation at 60 Hz
  • Dry-type design eliminates liquid coolant for simpler installation and maintenance
  • Square D brand backs industrial-grade power quality and distribution performance

Specifications

BrandSQUARE D
TypePower Quality & Distribution

Questions about this item

How much heat does the 55 °C temperature rise add to an enclosure when the 50 VA transformer runs continuously?

The 55 °C rise is the winding temperature above ambient at full 50 VA load; with the NEMA 3R ventilated enclosure the heat dissipates into the surrounding air, so allow adequate clearance around the unit.

What supply wiring and protection must already be in place to connect the 600 V primary?

A 600 V AC source, correctly sized conductors and an over-current device rated for the transformer primary are required before the 120/240 V secondary can be used.

Can the 120 V and 240 V secondaries feed legacy 60 Hz control circuits without modification?

Yes, the copper-wound secondary delivers 120 V and 240 V at 60 Hz, matching standard legacy control voltage and frequency requirements.

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