Siemens MP240240CT2 40/40A Quadplex Miniature Circuit Breaker
- 40/40A
- 4 Pole
- Plug-On
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Siemens MP240240CT2 - 40/40A Quadplex Miniature Circuit Breaker
New
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Description
Engineered to save enclosure space, this quadplex breaker provides two independent 40A, 240V circuits while only occupying two standard pole positions. It is ideal for residential environments requiring multiple high-draw feeds. The plug-on module installs easily into compatible Murray load centers. For modern upgrades, this specific model transitions to the newer Siemens Q24040CT2 substitute. Both the center and outer poles feature common trip mechanisms, supported by a 10kAIC rating.Specifications
| Brand | Siemens |
|---|---|
| Series | MP |
| Amperage | 40/40A |
| Poles | 4 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | MP |
|---|---|
| Terminal Type | Lugs |
| For Use With | Murray Load Centers |
| 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 |
| Special Classification | Quadplex |
|---|---|
| Available Options | Padlock Attachment |
| Standards | CSA C22.2, HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip, HACR Rated |
Product FAQs
7 answersWhich load centers are approved for the MP240240CT2 circuit breaker?
This breaker is UL listed for use in Murray load centers that accept MP-T or MH-T type plug-in breakers. It is commonly used to add 240V circuits to older Murray panels where space is limited.
How many panel spaces does this quadplex breaker occupy?
It requires two standard 1-inch panel spaces. This quadplex design allows you to install two independent 2-pole 40A circuits in the physical footprint normally required for a single 2-pole breaker.
How are the 40A circuits configured on this quad breaker?
The breaker contains two separate 40A, 240V circuits. The two outer poles are tied together to form the first 2-pole 40A circuit, while the two inner poles form the second 2-pole 40A circuit.
Are the inner and outer circuits common trip?
Yes, the CT2 designation indicates that both the inner 40A circuit and the outer 40A circuit feature an internal common trip. An overload on one leg of a circuit will trip both poles of that specific circuit to safely disconnect 240V power.
Is this breaker a direct replacement for older Murray 40/40 quad breakers?
Yes, the Siemens MP240240CT2 is the exact manufacturer replacement for legacy Murray MP240240CT2 breakers. Siemens acquired Murray and continues to produce the MP line to support existing Murray load centers.
What type of loads is this 40/40A quad breaker typically used for?
With two independent 40A 240V circuits, it is frequently used to supply power to heavy residential loads such as electric ranges, large air conditioning condensers, or subpanels, provided the panel bus has sufficient capacity.
What are the best practices for terminating aluminum wire on this breaker?
While the lugs accept 8 to 4 AWG aluminum conductors, you should apply a listed joint compound to the stripped aluminum wire before insertion. Torque the terminal screws to the manufacturer specifications printed on the breaker to prevent thermal expansion issues.
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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!