Eaton T20P11S99QCUN4 Totally enclosed transformer - NEMA 4
Part Number: T20P11S99QCUN4
Quick Summary
Eaton T20P11S99QCUN4 Totally enclosed transformer delivers reliable power isolation for industrial panels and data centers. For engineers facing space constraints and harsh environments, the enclosed design minimizes venting needs and protects against dust and moisture. This unit carries UL Listed certification and a NEMA 4 enclosure, with CASE E frame and 150°C insulation rise, suitable for rugged settings. The combination of 60 Hz operation, 100 kVA rating, and dual voltages supports scalable, reliable power distribution in automation facilities. This aligns with modern plant electrical distribution strategies while supporting maintenance efficiency and safety compliance in demanding applications.
Product Information
Extended Description
T20P11S99QCUN4 Eaton: EATON TOTALLY ENCLOSED NON-VENTILATED TRANSFORMER EXEMPT 2016, 60 HZ, 100KVA, SINGLE PHASE, 240VX480V, 120/240V, NEMA ST-20, 150°C RISE, NEMA 4, CASE E, 220°C, 1@+5%, 2@-5% X 2@+2.5%, 4@-2.5%
Product Name
Eaton Totally enclosed non-ventilated transformer
Catalog Number
T20P11S99QCUN4
UPC
786689958909
Product Length/Depth
32 in
Product Height
66 in
Product Width
50.5 in
Product Weight
615 lb
Compliances
Not Applicable
Certifications
UL Listed
Coil material
Copper
Enclosure
NEMA 4
Frame
CASE E
Insulation
220°C
Tap size
1@+5%, 2@-5% X 2@+2.5%, 4@-2.5%
Efficiency
Exempt
Frequency rating
60 Hz
Kva Rating
100 kVA
Phase
Single-phase
Primary voltage
240 V, 480 V
Secondary Voltage
120/240 V
Sound Level
NEMA ST-20
Temperature rise
150 °C rise
Special features
TOTALLY ENCLOSED NON-VENTED NEMA 4 ENCLOSURE
Feature → Business Impact → Application: Totally enclosed non-ventilated design minimizes air ingress and eliminates the need for internal cooling paths, reducing maintenance intervals and shielding critical loads from dust and moisture. This translates to lower downtime in manufacturing lines and safer operation in dirty or humid environments. Application: control panels and equipment rooms in food and beverage, plastics, and packaging lines benefit from predictable performance with minimal field venting. Feature → Business Impact → Application: 100 kVA rating at 60 Hz provides ample headroom for startup surges and peak loads, enabling tighter panel consolidation and fewer transformers per line. Application: machine tools, presses, and robotics cells benefit from compact footprint and consistent voltage delivery. Feature → Business Impact → Application: dual primary voltage options of 240/480 V with secondary 120/240 V simplify integration with existing power systems, lowering conversion losses and simplifying wiring schematics. Application: mixed-voltage automation systems and retrofit projects. Feature → Business Impact → Application: Copper windings and 220°C insulation support high thermal tolerance and durability, improving long-term reliability and reducing replacement cycles. Application: harsh factory floors and outdoor bays with temperature fluctuations. Feature → Business Impact → Application: CASE E frame and NEMA 4 enclosure enhance mechanical robustness, protecting windings during shipping and installation. Application: outdoor substations, outdoor control cabinets, and boundary screens. Feature → Business Impact → Application: UL Listed and NEMA 4 compliance simplify procurement, testing, and regulatory alignment for industrial projects. Application: audit-ready safety and compliance workflows in energy-intensive facilities.
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FAQs
Optimal installation requires a stable, level foundation and access to the NEMA 4 enclosure for weather protection. Ensure adequate clearance for cooling and wiring access, verify a suitable primary supply (240/480 V) and secondary load (120/240 V), and follow local electrical codes during panel integration. Use copper wire with appropriate gauge and install protective devices per the 100 kVA rating.
Yes. The unit features a NEMA 4 enclosure and a totally enclosed non-ventilated design, which resists dust, moisture, and humidity. This makes it well suited for outdoor installations and wash-down environments commonly found in manufacturing floors, food processing, and packaging lines, while reducing maintenance needs.
The transformer provides 240/480 V primary and 120/240 V secondary in a single-phase, 100 kVA configuration. This enables straightforward integration with existing 240/480 V mains and 120/240 V secondary-rated control circuits, minimizing the need for voltage conversion and simplifying panel wiring diagrams.
The unit is UL Listed and housed in a NEMA 4 enclosure with a CASE E frame, and it supports a 150°C insulation rise. These certifications matter for regulatory compliance, safety assurance, and reliability in harsh industrial environments, helping you meet audit requirements and reduce acceptance testing times.
Expect lower maintenance due to the sealed, non-ventilated enclosure and copper windings, which resist corrosion and degrade less over time. The 60 Hz, 100 kVA rating supports dependable power delivery with reduced downtime, translating into improved line productivity and a favorable return on investment for automated systems and critical loads.