Eaton 125MCSR231 LV AutoVAR 300 capacitor bank - UL/CSA
Part Number: 125MCSR231
Quick Summary
Eaton 125MCSR231 is an LV AutoVAR 300 capacitor bank designed to improve power factor and voltage stability in three-phase 240V systems. For engineers, the challenge is balancing reactive power with full-load capacity without oversizing equipment. This unit carries CSA Certified and UL Listed credentials with UL 508A, UL 810, and IEEE Std. 18 compliance, helping ensure safe operation and code conformity in demanding environments. Built for wall-mounted installation, it offers scalable 125 kVAR capacity (5 x 25 kVAR steps) with an optional 65 kAIC MCCB, delivering tangible business value through energy efficiency, reduced penalties, and reliable performance in industrial facilities and data centers alike.
Product Information
Extended Description
125MCSR231 Eaton: Eaton AUTOVAR 300, Automatic Capacitor Banks, 300A, 240V, Three-phase, 125 kVAR, Wall-mounted, 5 x 25, 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
125MCSR231
UPC
786685198170
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
240V
Frame size
J
Rating
125 kVAR
Step X kVAR
5 x 25 kVAR
Eaton Specification Sheet - 125MCSR231
Selling Policy 25-000 - Distribution and Control Products and Services
Feature → Business Impact → Application: The 300 A amperage rating with 125 kVAR total capacity enables precise three-phase power factor correction, reducing reactive power and lowering utility charges in manufacturing lines and HVAC-driven facilities. Application: large motors, pumps, and compressors. Feature → Business Impact → Application: Wall mounting with a 14 in depth and 36 in width/height footprint, combined with a 292 lb weight, simplifies retrofit and minimizes space constraints in crowded electrical rooms. Application: existing plants upgrading PF correction without expansive renovations. Feature → Business Impact → Application: Optional molded-case circuit breaker rated 65 kAIC at 480/600V and NEMA 3R weatherproofing extend protection and outdoor viability, reducing wiring changes and enabling mixed indoor/outdoor deployments. Application: outdoor switchgear adjacencies and weather-exposed installations. Feature → Business Impact → Application: CSA Certified and UL Listed to UL 508A, UL 810, and IEEE 18 standards provide confidence for compliance-heavy projects, lowering procurement risk and accelerating approvals. Application: panel builders and integrators delivering certified control solutions. Feature → Business Impact → Application: 14 in length, 36 in height and width, 292 lb weight, and a robust J frame with 5 x 25 kVAR steps support scalable expansion and straightforward maintenance, improving total cost of ownership over time. Application: facilities planning for phased PF upgrades and future capacity. Feature → Business Impact → Application: Comprehensive Eaton support and catalog notes indicating other ratings available on request, enabling tailored configurations for unique site requirements. Application: engineering design reviews and factory acceptance testing.
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FAQs
The AutoVAR 300 is wall-mounted and measures 14 in (depth) by 36 in (width) by 36 in (height) with a weight of 292 lb, requiring suitable wall clearance and access for wiring. Plan for space adjacent to control gear, allow service clearance, and consider the optional MCCB placement. If outdoor use is anticipated, ensure NEMA 3R weatherproofing is compatible with the site environment.
125MCSR231 is a three-phase capacitor bank rated for 240V, with a 300 A amperage rating and a total of 125 kVAR, configured as a 5 x 25 kVAR stepped bank (5 steps of 25 kVAR). It uses a J frame and supports wall mounting, with an optional molded-case circuit breaker rated 65 kAIC at 480/600V.
Yes. The unit includes NEMA 3R weatherproofing and is suitable for outdoor or harsh indoor environments when mounted in appropriate enclosures. The optional 65 kAIC MCCB provides enhanced protection for outdoor installations, and its weather-rated build supports reliable operation in exposed locations.
The product is CSA Certified and UL Listed, with UL 508A and UL 810 certifications and IEEE Std. 18 compliance. These credentials support safe, code-compliant integration into industrial control panels and meeting regulatory requirements in many regions.
Warranty terms follow Eaton Selling Policy 25-000: one year from date of installation or eighteen months from the date of shipment, whichever occurs first. This coverage supports diagnostic support, replacement of defective components, and access to Eaton technical resources for commissioning and maintenance.