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Siemens Q390H Miniature Circuit Breaker
- 90A
- 3 Pole
- Plug-On
Siemens
Q390H
Miniature Circuit Breaker
Brand
Siemens
SKU
Q390H
Quantity
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Siemens Q390H - 90A 3 Pole Miniature Circuit Breaker
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Description
Built for systems requiring higher fault tolerance, this 90A QPH series component delivers a 22kAIC interrupting capacity at 240VAC. It fits seamlessly into Siemens EQ, PL, ES, and Ultimate load centers for commercial or industrial use. As a thermal-magnetic unit, it provides standard long-time and instantaneous protection while serving as an excellent upgrade for legacy MP390 installations.Specifications
| Brand | Siemens |
|---|---|
| Part Number | Q390H |
| Series | QPH |
| Amperage | 90A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 22kA @ 240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, EQ, PL, ES, Ultimate Load Centers |
| 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 |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, High Interrupting Capacity |
Product FAQs
7 answersWhich load centers are compatible with the Q390H breaker?
This plug-on breaker is designed for use in Siemens EQ, PL, ES, and Ultimate load centers. It is also backward compatible with many legacy ITE and Murray panels that accept QP or QPH type breakers.
What is the difference between the Siemens Q390 and the Q390H?
The H in the Q390H part number indicates a higher interrupting capacity. While the standard Q390 is rated for 10kAIC at 240V, the Q390H is rated for 22kAIC, making it suitable for commercial applications or locations with higher available fault currents.
How much panel space does this 3-pole breaker require?
The Q390H requires three standard 1-inch spaces in a compatible load center.
Is the Siemens Q390H suitable for HVAC equipment?
Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires this specific designation.
Can the Q390H replace older Murray or ITE breakers?
Yes, Siemens QPH breakers are the official replacements for legacy Murray and ITE breakers of the same frame size. The Q390H can directly replace an MP390H or serve as a high-interrupting upgrade for a standard MP390.
Is there a 65kAIC version of this 90A breaker available?
Yes, if your system requires a 65kAIC interrupting rating, you will need the HQP series equivalent, which is catalog number HQ390.
What type of trip mechanism does the Q390H use?
It features a fixed thermal-magnetic trip mechanism. The thermal component provides long-time protection against overloads, while the magnetic component provides instantaneous protection against short circuits.
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