Siemens Q240HH Miniature Circuit Breaker
- 40A
- 2 Pole
- Plug-On
Siemens
Q240HH
Miniature Circuit Breaker
Brand
Siemens
SKU
Q240HH
Quantity
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Siemens Q240HH - 40A 2 Pole Miniature Circuit Breaker
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Description
Engineered for extra high interrupting capacity, the 40A QP family component provides reliable thermal-magnetic protection for residential and commercial applications. It mounts into standard Siemens load centers and P1 panelboards, serving as a robust replacement for the legacy MP240KM. Featuring a 65kAIC rating at 120/240V and Insta-Wire connectors, this two-pole unit ensures secure terminations while meeting strict HACR standards for HVAC equipment.Specifications
| Brand | Siemens |
|---|---|
| Series | Q |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 65kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens Load Centers, Siemens P1 Panelboards |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 6 AWG (Cu), 4 AWG (Al) |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Extra High Interrupting Capacity |
Product FAQs
6 answersWhat does the HH suffix in the Q240HH catalog number indicate?
The HH designates an extra-high interrupting rating of 65kAIC at 120/240V AC. Standard Siemens QP breakers without the suffix are rated for 10kAIC, while those with a single H are rated for 22kAIC.
Which electrical panels are compatible with the Siemens Q240HH?
This Type QP breaker is designed for use in Siemens load centers and Siemens P1 panelboards that accept plug-on miniature circuit breakers. It is not compatible with GE, Square D, or Eaton panels.
Can I use the Q240HH to replace a standard Q240 or Q240H breaker?
Yes. The Q240HH shares the same physical dimensions and plug-in mounting style as the Q240 and Q240H. It can be used as a direct replacement while providing a higher 65kAIC interrupting capacity.
Is the Siemens Q240HH circuit breaker HACR rated?
Yes, this breaker is HACR rated, making it suitable for use with heating, air conditioning, and refrigeration equipment that requires this specific safety designation.
Do the terminal lugs on the Q240HH accept both copper and aluminum wiring?
Yes, the lugs are rated for dual-rated conductors. They accept 8 to 6 AWG copper wire and 8 to 4 AWG aluminum wire.
Is the Q240HH compatible with older Murray load centers?
Siemens acquired Murray, and Type QP breakers like the Q240HH are often the UL-listed replacements for legacy Murray MP-T breakers. You must verify your specific panel labeling to confirm Type QP is an approved replacement.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 47 reviews.
Reviews Summary
Generated by AI from 91 most recent customer reviews
Last updated 8/1/25
Customers say these circuit breakers arrive quickly and match their specifications perfectly. Many reviews mention success finding hard-to-locate specialty breakers through this supplier. Common feedback includes praise for the accurate product descriptions, reliable shipping, and competitive pricing. While some note occasional stock limitations, users consistently report the breakers fit and function as intended.
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Rating
47 reviews
- CGCrocefissa G.Verified BuyerReviewingSiemens Q115 - 15A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Quick delivery and great price.
The circuit breakers are at a great cost.
- JBJason B.Verified BuyerReviewingSiemens Q2150B - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Great experience
The product was exactly what I needed and it arrived on time.
- DQDon Q.Verified BuyerReviewingSiemens Q3100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/14/26Siemens breaker
Great customer experience, great prices and fast shipping... Definitely will be buying her again.
- CSChristopher S.Verified BuyerRated 5 out of 5 stars8/12/26Siemens 60
Perfect new condition
- GSGeorge S.Verified BuyerReviewingSiemens Q2150B - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/4/26Great service
Every time I call or go online you have the parts I'm looking for.