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Siemens Q390 Miniature Circuit Breaker
- 90A
- 3 Pole
- Plug-On
Siemens
Q390
Miniature Circuit Breaker
Brand
Siemens
SKU
Q390
Quantity
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Siemens Q390 - 90A 3 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Siemens Q390 - 90A 3 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | Q390 |
| Series | QP |
| Amperage | 90A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, Siemens P1 Panelboards |
| Wire Gauge | 4-1/0 AWG (Cu), 2-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 4 AWG (Cu), 2 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Insta-Wire |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip, HACR Rated |
Sold out
Quantity
Siemens Q390 - 90A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | Q390-R |
| Series | QP |
| Amperage | 90A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, Siemens P1 Panelboards |
| Wire Gauge | 4-1/0 AWG (Cu), 2-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 4 AWG (Cu), 2 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Insta-Wire |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip, HACR Rated |
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Description
Designed for residential and commercial power distribution, this 90-amp three-pole QP series unit provides reliable thermal-magnetic protection. It serves as an exact, manufacturer-approved replacement for discontinued Murray MP390 models, ensuring seamless integration. The plug-on configuration installs easily into compatible Siemens load centers and P1 panelboards. Rated for 10kAIC at 240V, it includes Insta-Wire connectors for faster, more efficient conductor termination.Specifications
| Brand | Siemens |
|---|---|
| Part Number | Q390 |
| Series | QP |
| Amperage | 90A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, Siemens P1 Panelboards |
| Wire Gauge | 4-1/0 AWG (Cu), 2-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 4 AWG (Cu), 2 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Insta-Wire |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip, HACR Rated |
Product FAQs
7 answersWhich panelboards are compatible with the Q390 circuit breaker?
This breaker is designed for use in Siemens load centers and Siemens P1 panelboards that accept Type QP plug-on breakers.
Can the Siemens Q390 replace older Murray or ITE breakers?
Yes. Siemens Type QP breakers are the officially UL-listed replacements for obsolete Murray Type MP-T and ITE EQ-P breakers of the same amperage and pole configuration.
How many panel spaces does this 3-pole breaker require?
The Q390 requires three standard 1-inch spaces in a compatible Siemens load center or P1 panelboard.
Is the Siemens Q390 HACR rated?
Yes, Siemens QP breakers are HACR rated, making them suitable for use with heating, air conditioning, and refrigeration equipment.
What type of wire material is approved for the Q390 terminals?
The breaker lugs are rated for both copper (Cu) and aluminum (Al) conductors. Ensure you use the correct wire gauge (4-1/0 AWG for copper or 2-1/0 AWG for aluminum) and apply an approved oxide inhibitor if using aluminum wire.
Does this breaker provide GFCI or AFCI protection?
No, the Q390 is a standard thermal-magnetic circuit breaker. It provides overload and short-circuit protection but does not include Ground Fault (GFCI) or Arc Fault (AFCI) functionality.
Can the Q390 be installed in a standard residential single-phase panel?
No. As a 3-pole breaker, the Q390 requires a 3-phase panelboard or load center. Standard residential single-phase panels only accept 1-pole or 2-pole breakers.
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