Eaton 250MCSR431 capacitor bank - UL 508A
Part Number: 250MCSR431
Quick Summary
Eaton LV AutoVAR 300 capacitor bank provides automatic capacitor-assisted power factor correction for three-phase, 480 V electrical systems. Engineers often face voltage sags and rising reactive power penalties; this wall-mounted bank offers a scalable, plug-and-play solution. Certified CSA and UL listings—UL 508A, CSA Std. C22.2 No. 190, UL 810, and IEEE Std. 18—support industrial compliance and commissioning confidence. With a 300 A amperage rating, 250 kVAR capacity, and 5 x 50 kVAR steps, it integrates with existing cabinets and protects equipment while enabling rapid deployment across facilities. The unit’s NEMA 3R weatherproofing and optional MCCB option help ensure reliable operation in varied environments, delivering measurable energy and cost benefits to operations teams.
Product Information
Extended Description
250MCSR431 Eaton: Eaton AUTOVAR 300, Automatic Capacitor Banks, 300A, 480V, Three-phase, 250 kVAR, Wall-mounted, 5 x 50, J Frame, Optional molded-case circuit breaker rated 65 kAIC at 480V and 600V, NEMA 3R weatherproofing.
Product Name
Eaton LV AutoVAR 300 capacitor bank
Catalog Number
250MCSR431
UPC
786685198408
Product Length/Depth
14 in
Product Height
36 in
Product Width
36 in
Product Weight
292 lb
Warranty
Eaton Selling Policy 25-000, one (1) year from the date of installation of the Product or eighteen (18) months from the date of shipment of the Product, whichever occurs first.
Certifications
CSA Certified UL Listed UL 508A CSA Std. C22.2 No. 190 UL 810 IEEE Std. 18
Catalog Notes
Other ratings available, please consult factory.
Type
AUTOVAR 300
Amperage Rating
300 A
Mounting
Wall
Options
Optional molded-case circuit breaker rated 65 kAIC at 480V and 600V, NEMA 3R weatherproofing.
Phase
Three-phase
Product Category
Automatic Capacitor Banks
Voltage rating
480 V
Frame size
J
Rating
250 kVAR
Step X kVAR
5 x 50 kVAR
Feature → Business Impact → Application: The 300 A amperage rating combined with 250 kVAR capacity enables precise reactive power control, delivering meaningful improvements in power factor and reducing utility penalties for motor-heavy facilities. This translates to lower operating costs and more stable voltage profiles for critical equipment, such as pumps and conveyors in manufacturing lines. Feature → Application: 5 x 50 kVAR step sizing provides scalable correction, allowing facilities to tailor the bank to load growth and seasonal demand, reducing oversizing risk while maintaining fast response to load changes. Feature → Business Impact → Application: Wall mounting with a compact 14 in depth and 36 in by 36 in footprint optimizes floor space and enables straightforward retrofits in crowded electrical rooms or renovations. Feature → Application: Optional molded-case circuit breaker rated 65 kAIC at 480 V and 600 V provides integrated protection, simplifying wiring and improving fault isolation for safer commissioning. Feature → Business Impact → Application: NEMA 3R weatherproofing broadens deployment options to include damp or outdoor environments, improving uptime in manufacturing campuses and outdoor substations. Feature → Application: CSA and UL certifications, including UL 508A and IEEE Std. 18, ensure compliance with rigorous industry standards, accelerating procurement and reducing risk during audits. Feature → Business Impact → Application: A one-year warranty (or 18 months from shipment) minimises lifecycle risk, supporting total cost of ownership (TCO) planning and predictable maintenance budgeting.
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FAQs
The 250MCSR431 is designed for 480 V three-phase installations with a wall-mounted footprint. Its 300 A amperage rating and 250 kVAR capacity enable direct integration with standard motor loads and distribution panels, while the 5 x 50 kVAR steps allow progressive augmentation to match load growth. Optional MCCB protection simplifies wiring and aligns with site protection schemes.
Key specs include 480 V voltage rating, 300 A amperage, 250 kVAR total rating, three-phase configuration, and a step list of 5 x 50 kVAR. The unit is wall-mounted with a frame size J, dimensions 14 in depth by 36 in height and width, and a weight of 292 lb. Optional MCCB rated 65 kAIC at 480/600 V provides integrated fault protection.
Yes. The unit features NEMA 3R weatherproofing, making it suitable for exterior installations or damp indoor environments where reliable power factor correction is required, reducing weather-related downtime and maintenance.
It carries CSA Certified and UL Listed markings, including UL 508A, CSA Std. C22.2 No. 190, UL 810, and IEEE Std. 18, ensuring robust regulatory compliance and smoother audit processes for industrial facilities.
By improving power factor and reducing reactive power penalties, the AutoVAR 300 lowers energy costs and demand charges. The unit’s modular 5 x 50 kVAR steps support scalable deployments, while a one-year warranty (or 18 months from shipment) reduces upfront risk and simplifies procurement planning.