Siemens Q21550CT2 15/50A Quadplex Miniature Circuit Breaker
- 15/50A
- 4 Pole
- Plug-On
Siemens
Q21550CT2
15/50A Quadplex Miniature Circuit Breaker
Brand
Siemens
SKU
Q21550CT2
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Siemens Q21550CT2 - 15/50A Quadplex Miniature Circuit Breaker
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Description
Designed to maximize panel space, the Siemens Q21550CT2 is a quadplex miniature circuit breaker. It provides two 15A and two 50A poles within a compact Type QT frame for residential applications. This plug-on breaker mounts into Siemens CTL and Murray load centers, requiring only two standard panel spaces. It serves as a replacement for the discontinued MP21550CT2. Featuring thermal-magnetic trip technology, it delivers reliable protection with a 10kAIC rating and common trip functionality.Specifications
| Brand | Siemens |
|---|---|
| Series | QT |
| Amperage | 15/50A |
| 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 (CTL), Murray Load Centers |
| Wire Gauge | 15A: 14-6 AWG (Cu) / 12-6 AWG (Al), 50A: 8-6 AWG (Cu) / 8-4 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 |
| Accessories | Common Trip (Inner and Outer Poles) |
| Standards | HACR Rated, SWD Rated (15A Poles), UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Insta-Wire |
Product FAQs
5 answersHow many panel spaces does the Siemens Q21550CT2 require?
This quadplex breaker requires two standard 1-inch panel spaces. It provides two independent 2-pole circuits, one 15A and one 50A, in the physical footprint normally required for a single 2-pole breaker.
What does the CT2 suffix mean on this Siemens quad breaker?
The CT2 suffix indicates that both the inner and outer circuits are 2-pole common-trip breakers. This ensures that both legs of the 15A circuit or the 50A circuit will trip simultaneously if a fault occurs on either phase.
Can I use the Q21550CT2 in a Murray load center?
Yes, Siemens QT breakers are UL listed for use in Murray load centers that accept MH-T type breakers. Always verify your specific panel label to ensure CTL quadplex breakers are permitted in the target slots.
Does the Q21550CT2 have a rejection clip?
Yes, this is a Circuit Total Limiting (CTL) breaker equipped with a rejection clip. It can only be installed in panel slots specifically notched to accept CTL tandem or quadplex breakers. This prevents the panel from exceeding its maximum designed circuit capacity.
Is the Q21550CT2 HACR rated?
Yes, Siemens QT quadplex breakers are HACR rated. This makes them suitable for protecting heating, air conditioning, and refrigeration equipment that requires this specific listing.
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