Siemens Q24020CT2NC 40/20A Quadplex Miniature Circuit Breaker
- 40/20A
- 4 Pole
- Plug-On
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Siemens Q24020CT2NC - 40/20A Quadplex Miniature Circuit Breaker
New
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Description
The Q24020CT2NC is a space-saving quadplex breaker from Siemens, delivering 40A and 20A two-pole circuits in a compact two-inch footprint. This design maximizes circuit density in compatible enclosures, featuring common trip functionality on both the center and outer poles. Engineered without a CTL rejection clip, this non-CTL plug-on breaker installs into older Siemens and ITE panelboards. Rated for 10kAIC at 120/240VAC, the thermal-magnetic unit is HACR rated for HVAC applications.Specifications
| Brand | Siemens |
|---|---|
| Series | Q |
| Amperage | 40/20A |
| Poles | 4 |
| 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 (Non-CTL) |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 6 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Special Classification | Quadplex |
|---|---|
| Available Options | Padlock Attachment |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-CTL, Common Trip, HACR Rated, Space Saver |
Product FAQs
6 answersWhat does the NC suffix mean on the Q24020CT2NC breaker?
The NC suffix stands for Non-CTL (Circuit Total Limiting). This means the breaker is manufactured without a rejection clip, allowing it to be installed in older legacy Siemens or ITE load centers that do not have physical restrictions on tandem or quad breakers.
How many panel spaces does this quadplex breaker occupy?
This breaker requires two standard 1-inch panel spaces. It maximizes circuit density by providing two independent double-pole circuits (one 40A and one 20A) in the footprint of a standard two-pole breaker.
What is the pole configuration for the 40A and 20A circuits on this breaker?
This quadplex breaker features a 40-20-20-40 amp configuration. The two outer poles form the 40A double-pole circuit, while the two inner poles form the 20A double-pole circuit.
Does this breaker provide common trip protection on both circuits?
Yes. The CT2 designation indicates that both the 40A and 20A double-pole circuits feature an internal common trip mechanism. If an overload or short circuit occurs on one leg of a circuit, both legs of that specific circuit will trip simultaneously to ensure safety.
Is the Q24020CT2NC suitable for HVAC applications?
Yes, this thermal magnetic circuit breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires this specific rating.
Can I use this Siemens breaker to replace an older ITE quad breaker?
Yes. Siemens acquired ITE, and their current Q-series plug-on breakers are UL listed as direct replacements for legacy ITE breakers with matching specifications and Non-CTL mounting requirements.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 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.