Square D MHA115 Miniature Circuit Breaker
- 15A
- 1 Pole
- Bolt-On
Quantity
Square D MHA115 - 15A 1 Pole Miniature Circuit Breaker
Re-Certified
Quantity
Description
Built for commercial and industrial environments, this 15-amp single-pole breaker provides essential overcurrent protection. It is engineered to bolt securely into legacy Square D MH panelboards, maintaining the operation of older electrical infrastructure. For modern upgrades, this unit is officially replaced by the QOB115. The breaker delivers a 10kAIC interrupting rating at 120/240VAC and utilizes a fixed thermal-magnetic trip mechanism alongside a convenient Visi-Trip window.Specifications
| Brand | Square D |
|---|---|
| Part Number | MHA115-R |
| Series | MH |
| Amperage | 15A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | Legacy Square D MH Panelboards |
| Wire Gauge | 14-8 AWG (Al/Cu) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Standards | UL 489, CSA C22.2 No. 5 |
|---|---|
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator |
Product FAQs
6 answersWhich panelboards are compatible with the MHA115 circuit breaker?
This breaker is designed specifically for bolt-on installation in legacy Square D MH series panelboards.
Is there a modern replacement available for the MHA115?
Yes, the Square D QOB115 is the official modern substitute for the legacy MHA115. It provides the same 15-amp, single-pole protection and mounts directly into older MH panelboards.
How is the MHA115 secured to the panelboard?
It features a bolt-on connection type. The breaker must be mechanically fastened to the panelboard busbar with screws, ensuring a secure and vibration-resistant connection for commercial applications.
What wire sizes and materials are accepted by the terminals on this breaker?
The box lugs are rated for both aluminum and copper conductors, accepting wire gauges from 14 AWG up to 8 AWG.
What type of protection does the MHA115 provide?
It utilizes a fixed thermal-magnetic trip unit with long-time and instantaneous (LI) functions. This provides reliable protection against both sustained overcurrent conditions and sudden short circuits.
Can I use this breaker in a standard residential plug-on load center?
No. The MHA115 is a bolt-on circuit breaker designed specifically for legacy MH panelboards. It lacks the mounting clips required for standard plug-on residential load centers.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 4 reviews.
- DLDeanna L.Verified BuyerReviewingSquare D MH36800 - 800A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/11/26Square D MH36800 - 800A 3 Pole Molded Case Circuit Breaker
Another satisfied customer.
- SBSteve B.Verified BuyerReviewingSquare D MH36600 - 600A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars1/23/26Square MH36600
Breaker was as advertised excellent condition
- SAStewart A.ReviewingSquare D MH38 Panel Board EnclosureI recommend this productRated 5 out of 5 stars3/25/19not at local supply
got what I needed, because it was not available at my local supply house.
- WWWilliam W.ReviewingSquare D MH32 Panel Board EnclosureI recommend this productRated 5 out of 5 stars7/1/18INSIDE THE BOX
Great Buy ! Shipped on time. No Damage. Just what we ordered Thanks