Siemens Q24030CT2NC 40/30A Quadplex Miniature Circuit Breaker
- 40/30A
- 4 Pole
- Plug-On
Siemens
Q24030CT2NC
40/30A Quadplex Miniature Circuit Breaker
Brand
Siemens
SKU
Q24030CT2NC
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Siemens Q24030CT2NC - 40/30A Quadplex Miniature Circuit Breaker
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Description
Manufactured for older residential applications, the Siemens Q24030CT2NC is a Non-CTL quadplex breaker that maximizes available space. It delivers a 40A and a 30A common-trip circuit within a single compact unit, making it ideal for expanding capacity in legacy systems. This plug-on breaker installs into pre-1968 Siemens load centers that do not utilize current-limiting rejection tabs. Operating at 120/240VAC with a 10kA rating, it features reliable thermal-magnetic trip technology.Specifications
| Brand | Siemens |
|---|---|
| Part Number | Q24030CT2NC |
| Series | QT |
| Amperage | 40/30A |
| 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 / Pre-1968) |
| Wire Gauge | 40A: 8-6 AWG (Cu) / 8-4 AWG (Al), 30A: 14-6 AWG (Cu) / 12-6 AWG (Al) |
| Max Wire | 4 AWG (Al) |
| Min Wire | 14 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 | HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-CTL, Common Trip, Space Saver |
Product FAQs
6 answersWhat panels are compatible with the Siemens Q24030CT2NC quadplex breaker?
This Non-CTL breaker is designed for use in older, pre-1968 Siemens and ITE load centers that do not require circuit-limiting (CTL) rejection features. It will fit into any available two spaces in these legacy panels.
How many panel spaces does the Q24030CT2NC require?
This quadplex breaker requires two standard 1-inch panel spaces to provide two independent 2-pole circuits, one 40A and one 30A.
What does the NC suffix indicate on the Q24030CT2NC breaker?
The NC suffix stands for Non-CTL. This means the breaker lacks a rejection clip, allowing it to be installed in older panels that do not restrict the use of tandem or quadplex breakers.
What does CT2 mean in the Q24030CT2NC catalog number?
The CT2 designation indicates that both the inner and outer pairs of the quadplex breaker feature a common trip mechanism. If a fault occurs on one leg of either the 40A or 30A circuit, both poles of that specific circuit will trip simultaneously.
What wire sizes are accepted by the terminals on the Q24030CT2NC?
For the 40A circuit, the lugs accept 8-6 AWG copper or 8-4 AWG aluminum wire. For the 30A circuit, the lugs accept 14-6 AWG copper or 12-6 AWG aluminum wire.
Can I use the Q24030CT2NC to replace an older ITE quad breaker?
Yes, this Siemens breaker is a direct replacement for older ITE Q24030CT2NC breakers. Siemens acquired ITE and maintains backward compatibility for these legacy Non-CTL load centers.
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