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Siemens Q340H Miniature Circuit Breaker
- 40A
- 3 Pole
- Plug-On
Siemens
Q340H
Miniature Circuit Breaker
Brand
Siemens
SKU
Q340H
Quantity
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Siemens Q340H - 40A 3 Pole Miniature Circuit Breaker
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Description
Delivering 22kAIC of fault protection, this three-pole 40A component serves commercial and industrial electrical systems. It installs into Siemens PL, ES, and Ultimate load centers, while also serving as a verified replacement for the discontinued Murray MP340H. The QPH series design incorporates Insta-Wire technology for faster installation and carries an HACR rating for heating and cooling equipment circuits.Specifications
| Brand | Siemens |
|---|---|
| Part Number | Q340H |
| Series | QPH |
| Amperage | 40A |
| 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, Murray Load Centers, EQ Load Centers, PL Load Centers, ES Load Centers, Ultimate Load Centers |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 6 AWG (Cu), 4 AWG (Al) |
| Min Wire | 8 AWG |
| 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 | Common Trip, HACR Rated, Insta-Wire |
Product FAQs
6 answersWhat is the difference between the Siemens Q340 and the Q340H?
The 'H' in the Q340H catalog number indicates a high interrupting rating. While the standard Q340 has a 10kAIC rating, the Q340H provides a 22kAIC rating at 240VAC for systems with higher available fault current.
Can I use the Q340H in a Murray load center?
Yes. Siemens manufactures both brands, and QP/QPH series breakers are UL listed for use in most Murray load centers. The Q340H is the direct replacement for the discontinued Murray MP340H.
Can I install this 3-pole breaker in a standard residential panel?
No. The Q340H is a 3-pole breaker designed exclusively for 3-phase load centers. It will not fit or operate in a standard 120/240V single-phase residential panel.
Do I need a hold-down kit if I use the Q340H as a back-fed main breaker?
Yes. If you are installing this plug-on breaker as a back-fed main, the National Electrical Code (NEC) requires a mechanical retainer clip. You will need a compatible hold-down kit, such as the Siemens ECMBR1 or ECMBR2, depending on your specific load center series.
What is the recommended lug torque for the Q340H?
For 40A Siemens QP and QPH breakers, the standard lug torque is typically 40 lb-in. Always verify the exact torque requirements printed on the side label of the breaker before finalizing your installation.
Is this circuit breaker HACR rated?
Yes, the Siemens Q340H is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires this specific protection.
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