Siemens / Murray MP140 Miniature Circuit Breaker
- 40A
- 1 Pole
- Plug-On
Quantity
Siemens / Murray MP140 - 40A 1 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Siemens / Murray MP140 - 40A 1 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Siemens / Murray |
|---|---|
| Part Number | MP140 |
| Series | MP |
| Amperage | 40A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Murray Load Centers, Siemens Load Centers |
| 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 |
| Available Options | Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Insta-Wire |
Quantity
Siemens / Murray MP140 - 40A 1 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens / Murray |
|---|---|
| Part Number | MP140-R |
| Series | MP |
| Amperage | 40A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Murray Load Centers, Siemens Load Centers |
| 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 |
| Available Options | Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Insta-Wire |
Description
Manufactured under the Murray family line, this 40-amp miniature circuit breaker provides essential overcurrent protection for residential applications. The single-pole design utilizes standard thermal-magnetic trip technology to handle overloads and short circuits. This plug-on unit mounts into legacy Murray load centers without requiring special adapters.Specifications
| Brand | Siemens / Murray |
|---|---|
| Part Number | MP140 |
| Series | MP |
| Amperage | 40A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Murray Load Centers, Siemens Load Centers |
| 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 |
| Available Options | Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Insta-Wire |
Product FAQs
5 answersCan I use the Murray MP140 in a Siemens load center?
Yes. Siemens acquired Murray and issued UL documentation confirming that Siemens load centers can accept Murray MP series breakers. Always verify your specific panel label to ensure Type MP is listed as an approved breaker type.
What is the direct replacement for the Murray MP140?
The Siemens Q140 (Type QP) is the direct, UL-approved replacement for the Murray MP140. Siemens phased out the Murray brand and consolidated its residential breaker lines under the Siemens QP series.
Is the MP140 breaker HACR rated?
Yes, the Murray MP140 is HACR rated. This makes it suitable for use with heating, air conditioning, and refrigeration equipment that requires this specific overcurrent protection.
Will this plug-on breaker fit older Crouse-Hinds panels?
Yes, many older Crouse-Hinds load centers list Murray MP breakers as approved for use. Check your panel interior label to confirm it accepts Type MP or Type EQ-P breakers before installation.
Can I use the MP140 for a 240V circuit?
No. The MP140 is a 1-pole breaker designed for 120V circuits. For a 240V application requiring 40 amps, you must use a 2-pole breaker like the Murray MP240 or Siemens Q240.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 4 reviews.
- JVJulie V.Verified BuyerReviewingSiemens / Murray MP2100 - 100A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars3/5/26on breaker
so far so good on the refurbished breaker
- JFJon F.ReviewingSiemens / Murray MP250 - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars12/17/20Sales
Fantastic group to work with...
- DSDavid S.ReviewingSiemens / Murray MP2100 - 100A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars1/5/20Thank you so much for
Thank you so much for sending me a 100 amp breaker that was in the condition that you said it would be in.With out your breaker I would still be in the dark Thank you David
- RARichard A.ReviewingSiemens / Murray MP2100 - 100A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/13/19Awesome!
Your prices and number of available items to choose from is Awesome!