Eaton BQL340 Thermal Magnetic Circuit Breaker - HACR Rated
Part Number: BQL340
Quick Summary
Eaton BQL340 thermal magnetic circuit breaker protects electrical panels in industrial applications. Retrofits often stall due to mismatched form factors and wiring, leading to costly downtime. The device carries HACR rated compliance and is built for 120/240 V operation with a 40 A rating and 10 kAIC interrupt capability. Its bolt-on Classic replacement design simplifies field swaps and reduces panel downtime, while Cu/Al wire compatibility broadens compatibility for panel builders.
Product Information
Extended Description
BQL340 Eaton: BQL Classic Replacement Circuit Breakers, Bolt-on Breaker, 40A, #14-4 AWG, Three-pole
Product Name
Eaton BAB thermal magnetic circuit breaker
Catalog Number
BQL340
UPC
782114304143
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
#14-8 AWG Cu/Al
Amperage Rating
40 A
Interrupt rating
10 kAIC at 120/240 Vac
Voltage rating
120/240 V
The BQL340 uses a bolt-on three-pole design that simplifies installation and minimizes panel disruption, delivering fast upgrades in legacy systems and reducing commissioning time. With a 40 A amperage rating and a 10 kAIC interrupt capacity at 120/240 VAC, it protects motors and control circuits from short circuits while maintaining reliable operation in demanding environments. The 5 in length, 3 in height, and 3 in width keep a compact footprint that fits standard control panels, and the 0.5 lb weight eases handling during retrofits. Cu/Al wire size #14-8 is supported, broadening compatibility with existing feeders and enabling cost-effective replacements. This classic replacement breaker aligns with HACR-rated standards and helps ensure safe HVAC and electrical protection across facilities. It also supports quick, nuisance-free maintenance and panel modernization projects.
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FAQs
The BQL340 is designed as a three-pole bolt-on breaker and serves as a classic replacement for Eaton BQL family panels. With a compact 5 in × 3 in × 3 in form factor and a weight of 0.5 lb, it fits common control panels and requires standard #14-8 AWG Cu/Al wiring. This combination enables straightforward retrofits with minimal panel modification and faster commissioning.
The BQL340 provides a 40 A amperage rating and a 10 kAIC interrupt rating at 120/240 VAC. It is built for 120/240 V operation and uses a three-pole design to protect three-phase circuits in commercial or light industrial panels. These ratings support reliable short-circuit protection while maintaining safe, Code-compliant operation.
Best used in control panels, motor feeders, and HVAC-related protection circuits where HACR-rated devices are advantageous. The triple-pole configuration provides balanced protection for three-phase loads, while the bolt-on form factor facilitates rapid retrofits in existing installations, reducing downtime and lowering maintenance costs in industrial environments.
Data specifies HACR-rated compliance for HVAC and related control circuits, reflecting suitability for systems requiring heat, air, and cooling equipment protection. While regional certifications may vary, HACR Rating is a key indicator of appropriate performance for HVAC-driven panels and general electrical protection in 120/240 V applications.
Bolt-on replacement reduces downtime during panel upgrades by eliminating extensive rewiring. The 40 A rating aligns with common motor and control circuits, while the 10 kAIC interrupt rating lowers damage risk from faults, contributing to lower repair costs and faster commissioning. Overall, you gain predictable performance and faster return-on-investment through streamlined maintenance workflows.