Eaton 643PMURF LV Unipak capacitor bank - UL Listed
Part Number: 643PMURF
Quick Summary
The Eaton LV Unipak capacitor bank is a three-phase solution that provides reactive power support for 480 V distribution networks. Engineers often contend with voltage drop, poor power factor, and escalating demand charges that erode efficiency and increase costs. This unit carries CSA Certified and UL Listed certifications and is housed in a rugged NEMA 1, NEMA 3R enclosure. With a 6 kVAR rating, 7.2 A current, and an A1 frame, it delivers dependable correction while protecting you with three fuses and neon indicator lights. Designed for industrial settings, it combines robust construction with precise electrical performance, enabling reliable power factor correction, simpler maintenance, and predictable energy savings over time.
Product Information
Extended Description
643PMURF Eaton: Eaton LV Unipak capacitor bank, UNIPAK, Low Voltage Fixed Capacitor Banks, 7.2A, 480V, Three-phase, 6 kVAR, Protected, Neon red blown-fuse indicating lights, Three midget-type fuses, A1 Frame
Product Name
Eaton LV Unipak capacitor bank
Catalog Number
643PMURF
UPC
782116058600
Product Length/Depth
5.254 in
Product Height
17.3 in
Product Width
8.5 in
Product Weight
19 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
Catalog Notes
Multiply the 240V kVAR rating by 0.75 to calculate the kVAR value at 208V.
Type
UNIPAK
Amperage Rating
7.20A
Fuse type
Three midget-type fuses with 100,000 ampere interrupting capacity
Phase
Three-phase
Product Category
Low Voltage Fixed Capacitor Banks
Voltage rating
480 V
Enclosure
NEMA 1, NEMA 3R
Enclosure material
14 gauge steel finished with durable powder coat finish
Frame size
A1
Indicators
Red, neon blown-fuse indicating lights are protected by transparent weatherproof guard
Protection
Three fuses, three lights
Rating
6 kVAR
Eaton Specification Sheet - 643PMURF
Selling Policy 25-000 - Distribution and Control Products and Services
Feature → Business Impact → Application: UNIPAK three-phase design delivers compact, integrated reactive power support, reducing system losses and improving voltage stability across the bus. This translates to measurable efficiency gains and lower utility demand charges for facilities with motor loads, compressors, and HVAC systems. Application: ideal for manufacturing floors, data centers, and large commercial spaces seeking reliable power factor correction without complex rack assemblies. Feature → Business Impact → Application: 480 V operation with a 6 kVAR rating provides targeted VAR compensation at typical industrial voltages, enabling precise control of power factor and helping meet utility incentives. Application: suitable for panelboards and switchgear where fixed capacitor banks are preferred for maintainable, long-term performance. Feature → Business Impact → Application: protected with three fuses and neon lights (100,000 AIC) and weatherproof guard improves uptime by quick fault visibility and safer maintenance. Application: supports rapid fault diagnosis in rugged environments. Feature → Business Impact → Application: rugged EN closure with 14 gauge steel and powder coat finish (A1 frame) delivers durable performance in dirty or damp facilities. Application: outdoor or harsh indoor installations requiring sturdy protection. Feature → Business Impact → Application: catalog note to scale kVAR from 240 V by 0.75 for 208 V networks ensures accurate sizing when the facility uses mixed voltages. Application: helps electrical teams optimize installations across diverse sites while maintaining coordination with legacy equipment.
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FAQs
The 643PMURF is a three-phase, 480 V unit designed for straightforward integration into standard low-voltage panels. It uses a three midget-type fuse array with 100,000 AIC and features neon blown-fuse indicators for quick visibility. The enclosure is a rugged 14-gauge steel with a powder coat finish, suitable for NEMA 1 and NEMA 3R environments. Follow Eaton installation manuals for wiring, torque specs, and clearance, and ensure proper bus connections and protective interlocks are in place.
The unit provides 6 kVAR at 480 V. When sizing for alternate voltages such as 208 V, refer to the catalog guidance: multiply the 240 V kVAR rating by 0.75 to estimate the kVAR value at 208 V. This helps ensure correct reactive power compensation and avoids under- or over-sizing the bank for your distribution network.
This three-phase, low-voltage fixed capacitor bank is ideal for power-factor correction in industrial facilities, HVAC systems, and motor-driven processes. By supplying reactive power locally, it reduces line losses, improves voltage profiles, and lowers energy costs. Its compact UNIPAK design simplifies installation in panelboards and switchgear, while maintaining reliable protection through its fuse and indicator system.
The 643PMURF carries CSA Certified and UL Listed certifications, underscoring safety and compliance for industrial environments. The enclosure is rated for NEMA 1 and NEMA 3R, offering indoor protection and outdoor rain exposure resistance, respectively. These features help meet electrical codes and procurement requirements for regulated facilities and mission-critical applications.
Eaton’s policy provides a one-year warranty from installation or eighteen months from shipment, whichever occurs first. This coverage helps mitigate down-time risks and supports ongoing maintenance planning. Coupled with energy savings from improved power factor, the unit offers a predictable return on investment through reduced energy charges and easier asset management.