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Siemens Q245 Miniature Circuit Breaker
- 45A
- 2 Pole
- Plug-On
Siemens
Q245
Miniature Circuit Breaker
Brand
Siemens
SKU
Q245
Quantity
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Siemens Q245 - 45A 2 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Siemens Q245 - 45A 2 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | Q245 |
| Series | Q |
| Amperage | 45A |
| 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 P1 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 |
| Available Options | Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip |
Sold out
Quantity
Siemens Q245 - 45A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | Q245-R |
| Series | Q |
| Amperage | 45A |
| 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 P1 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 |
| Available Options | Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip |
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Description
Built for everyday residential and commercial power distribution, this 45A QP series component delivers dependable thermal-magnetic overcurrent protection. It snaps securely into Siemens load centers and P1 panelboards, acting as an exact cross-reference for the discontinued MP245. With a standard 10kAIC rating at 120/240VAC, the two-pole unit includes Insta-Wire technology to speed up installation and is fully HACR rated for heating and cooling circuits.Specifications
| Brand | Siemens |
|---|---|
| Part Number | Q245 |
| Series | Q |
| Amperage | 45A |
| 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 P1 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 |
| Available Options | Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip |
Product FAQs
5 answersCan I use the Siemens Q245 to replace a Murray MP245 breaker?
Yes. Siemens acquired Murray and has phased out the Murray brand. The Siemens Q245 (Type QP) is the officially documented, UL-listed direct replacement for the discontinued Murray MP245 (Type MP-T) circuit breaker.
Is the Siemens Q245 suitable for HVAC equipment?
Yes, this breaker is HACR rated, making it certified for use with compatible heating, air-conditioning, and refrigeration equipment that requires a 45-amp overcurrent protection device.
What is required if I want to backfeed the Q245 as a main breaker?
When backfeeding this plug-on breaker as a main in a compatible Siemens load center, the National Electrical Code (NEC) requires a mechanical hold-down kit. For Siemens Ultimate load centers, the ECMBR2 tie-down kit is typically used to secure Type QP breakers.
Will this breaker fit in older ITE load centers?
Yes, Siemens acquired ITE and continued the same panel designs. The Siemens Type QP breakers, including the Q245, are backward compatible and UL-listed for use in legacy ITE load centers that accept plug-on breakers.
Can I install this breaker in a plug-on neutral (PON) load center?
Yes, standard pigtail and non-electronic Type QP breakers like the Q245 are fully compatible with and listed for use in Siemens plug-on neutral (PN Series) load centers.
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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.