Eaton BQL390 Thermal Magnetic Circuit Breaker - 10 kAIC
Part Number: BQL390
Quick Summary
The Eaton BQL390 Thermal Magnetic Circuit Breaker protects critical power circuits with reliable three-pole overcurrent protection in 120/240 V systems. This model addresses the common challenge of finding authentic legacy replacements that fit older BAB/BQL panels without frequent field rewiring. With HACR-rated compliance and a 90 A rating, it delivers precise protection while helping HVAC and general electrical systems avoid nuisance trips. Its 10 kAIC interrupt capacity at 120/240 V ensures robust fault clearance in demanding environments. By matching Eaton’s classic BAB/BQL line, the BQL390 simplifies spares management and reduces downtime. The result is improved reliability, faster retrofits, and predictable maintenance costs for industrial facilities.
Product Information
Extended Description
BQL390 Eaton: BQL Classic Replacement Circuit Breakers, 90A, #8-2/0 AWG, Cu/Al, Three-pole, 10 kAIC at 120/240V
Product Name
Eaton BAB thermal magnetic circuit breaker
Catalog Number
BQL390
UPC
782114304181
Product Length/Depth
5 in
Product Height
3 in
Product Width
3 in
Product Weight
0.5 lb
Compliances
HACR Rated
Circuit breaker type
BQL
Number of poles
Three-pole
Type
Classic replacement circuit breaker
Wire size
#8-2/0 AWG Cu/Al
Amperage Rating
90 A
Interrupt rating
10 kAIC at 120/240 Vac
Voltage rating
120/240 V
Feature: 90 A amperage rating with a 10 kAIC interrupt capacity at 120/240 V. Business impact: provides dependable, code-compliant overcurrent protection for distribution feeders and motor loads, reducing the risk of costly outages and equipment damage. Application: three-pole installations in 120/240 V systems, including protected three-phase motors and control panels. Feature: Three-pole design with Cu/Al wire compatibility of #8-2/0 AWG. Business impact: supports flexible, mixed-conductor wiring and straightforward field modifications, lowering installation time and labor costs. Application: panel feeders and branch circuits in industrial environments where copper and aluminum conductors coexist. Feature: Classic replacement compatibility for legacy BAB/BQL panels. Business impact: enables rapid retrofits without panel rewiring, minimizing downtime and spare parts inventory. Application: upgrading older electrical distributions while preserving cabinet layouts and protection schemes. Feature: HACR rated protection. Business impact: improves energy efficiency in HVAC applications and enhances safety for commercial and industrial equipment. Application: HVAC equipment enclosures and general distribution panels where HACR compliance is beneficial. Feature: Compact footprint and lightweight construction (5 in L Ă— 3 in H Ă— 3 in W; 0.5 lb). Business impact: saves panel space, simplifies handling, and speeds installation in dense control cabinets. Application: space-constrained distribution boards and industrial panels needing reliable protection without footprint expansion. Feature: Voltage rating of 120/240 V with copper/aluminum compatibility. Business impact: versatile for mixed-power environments, reducing design constraints and procurement complexity. Application: machine rooms, manufacturing lines, and distribution panels requiring robust, flexible protection.
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FAQs
To install the BQL390, verify the panel accommodates a three-pole device and supports Cu/Al wiring up to #8-2/0 AWG. The unit's 5 in length, 3 in height, and 3 in width, along with a 0.5 lb weight, facilitate drop-in retrofits in legacy BAB/BQL panels. Ensure the 120/240 V rating matches the system, and tighten terminations to manufacturer torque specs for reliable electrical contact.
The BQL390 provides a 90 A amperage rating with a 10 kAIC interrupt capacity at 120/240 V. It is a three-pole device designed for 120/240 V systems, with HACR-rated protection. These specs translate to robust fault clearance for three-phase loads and better protection for motors, transformers, and control circuits in industrial environments.
Yes. The BQL390 is explicitly described as a classic replacement circuit breaker compatible with legacy BAB and BQL installations. Its three-pole design and identical form factor enable rapid retrofits without panel rewiring, reducing downtime and spare-part proliferation while maintaining the original protection scheme and electrical characteristics.
The product is HACR rated, which denotes compatibility with HVAC equipment and energy-efficient operation. This rating provides an added level of assurance for installations in facilities with HVAC loads. No additional certifications are listed in the provided data, so refer to Eaton’s datasheet for any further standards compliance.
Using the BQL390 can lower maintenance costs by standardizing on a single, legacy-compatible replacement that fits existing panels, reducing downtime during replacements. The HACR rating and robust 10 kAIC protection also contribute to longer service intervals and fewer nuisance trips, delivering predictable reliability for critical systems and reducing lifecycle costs.