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Siemens Q240 Miniature Circuit Breaker
- 40A
- 2 Pole
- Plug-On
Siemens
Q240
Miniature Circuit Breaker
Brand
Siemens
SKU
Q240
Quantity
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Siemens Q240 - 40A 2 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Siemens Q240 - 40A 2 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | Q240 |
| Series | Q |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, Siemens Panelboards |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 4 AWG (Al), 6 AWG (Cu) |
| 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, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Insta-Wire, Common Trip |
Sold out
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Siemens Q240 - 40A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | Q240-R |
| Series | Q |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, Siemens Panelboards |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 4 AWG (Al), 6 AWG (Cu) |
| 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, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Insta-Wire, Common Trip |
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Description
Rated for heavy-duty residential circuits, the Siemens Q240 handles 40-amp loads like electric ranges and large HVAC systems. This two-pole device integrates smoothly into modern Siemens load centers while also replacing older Murray MP240 units in existing setups. The plug-on design facilitates rapid deployment, complemented by Insta-Wire terminals for faster conductor seating. With a standard 10kA short-circuit rating and HACR certification, it meets stringent safety requirements.Specifications
| Brand | Siemens |
|---|---|
| Part Number | Q240 |
| Series | Q |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, Siemens Panelboards |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 4 AWG (Al), 6 AWG (Cu) |
| 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, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Insta-Wire, Common Trip |
Product FAQs
8 answersWhat panels are compatible with the Siemens Q240 circuit breaker?
This Type QP breaker is designed for use in Siemens PL, ES, EQ, and Ultimate series load centers. It is also compatible with older ITE and Gould panels that accept plug-on breakers.
Can I use this Siemens Type QP breaker in a Murray panel?
Yes. Siemens phased out the Murray brand and issued official documentation listing Siemens Type QP breakers as the UL-listed direct replacements for Murray Type MP-T breakers in panels manufactured after January 2002.
Are Q240 and QP240 the same circuit breaker?
Yes. QP refers to the breaker frame type and product family, while Q240 is the specific catalog number for the 40-amp, 2-pole version.
How much physical space does the Siemens Q240 require in a panel?
As a full-size, two-pole Type QP breaker, it requires two standard 1-inch spaces on the panel bus, utilizing a total width of 2 inches.
What does the 10kAIC interrupting rating mean for this breaker?
The 10,000 Amperes Interrupting Capacity (10kAIC) rating indicates the maximum fault current this breaker can safely interrupt without sustaining damage. This is the standard fault current rating required for most residential electrical systems.
What types of residential loads typically require a 40-amp, 2-pole breaker?
This breaker is commonly used for heavy 240-volt residential loads such as electric ranges, dual-element water heaters, and smaller subpanels. Always verify the manufacturer nameplate on your specific appliance to confirm the required overcurrent protection.
Do I need to connect a neutral wire to the Q240 breaker?
No. Standard thermal-magnetic breakers like the Q240 only connect to the ungrounded (hot) conductors. They do not feature GFCI or AFCI protection, so they do not require a neutral pigtail or a neutral connection at the breaker itself.
What does the LI trip function on this breaker provide?
The LI (Long-Time and Instantaneous) designation means this breaker uses a thermal-magnetic mechanism. The thermal element (Long-Time) protects against gradual overloads, while the magnetic element (Instantaneous) reacts immediately to short circuits to safely disconnect the power.
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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.