Siemens Q370HH Miniature Circuit Breaker
- 70A
- 3 Pole
- Plug-On
Quantity
Siemens Q370HH - 70A 3 Pole Miniature Circuit Breaker
New
Quantity
Description
Part of the Q Series, the Siemens Q370HH is a 3-pole, 70-amp miniature circuit breaker designed for commercial and industrial electrical distribution. It provides reliable thermal-magnetic protection for 240V systems requiring robust fault clearing capabilities. This Type HQP breaker mounts into Siemens P1 panelboards and compatible 3-phase load centers. It features a standard plug-on design with lug terminals accepting 8-4 AWG copper or 8-2 AWG aluminum wire.Specifications
| Brand | Siemens |
|---|---|
| Series | Q |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P1 Panelboards, Siemens 3-Phase Load Centers |
| Wire Gauge | 8-4 AWG (Cu), 8-2 AWG (Al) |
| Max Wire | 4 AWG (Cu), 2 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, HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Extra High Interrupting Capacity |
Product FAQs
5 answersWhat panelboards are compatible with the Siemens Q370HH circuit breaker?
The Q370HH is designed for use in Siemens P1 Panelboards and Siemens 3-Phase Load Centers. Because it is a 3-pole breaker, it requires a 3-phase electrical system and occupies three spaces on the panel bus.
What does the HH suffix signify in the Q370HH catalog number?
The HH suffix indicates an extra-high interrupting rating. While standard Siemens Q-series breakers offer a 10kAIC rating, the Q370HH provides a 65kAIC rating at 240VAC for commercial and industrial systems with higher available fault currents.
Can the Q370HH replace a standard Q370 or Q370H breaker?
Yes. The Q370HH shares the same physical footprint and plug-in mounting as the standard Q370 (10kAIC) and Q370H (22kAIC). It can be installed in the same panel spaces when a higher 65kAIC short-circuit rating is required by your system design.
Can the Siemens Q370HH replace a legacy Murray circuit breaker?
Yes. Siemens has officially designated their Q-series breakers as direct replacements for legacy Murray MP-series breakers. The Q370HH can be used to replace a Murray MP370 or MP370H in compatible load centers.
Is the Q370HH suitable for HVAC applications?
Yes. The Q370HH carries an HACR (Heating, Air Conditioning, and Refrigeration) rating, making it suitable for protecting HVAC equipment, motors, and general branch circuits that require a 70A, 3-phase supply.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 48 reviews.
- DTDawn T.Verified BuyerReviewingSiemens Q2150B - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars10/8/26Timely
This is exactly what I was looking for! Worked perfectly, arrived promptly, no hassles.
- CGCrocefissa G.Verified BuyerReviewingSiemens Q115 - 15A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Quick delivery and great price.
The circuit breakers are at a great cost.
- JBJason B.Verified BuyerReviewingSiemens Q2150B - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Great experience
The product was exactly what I needed and it arrived on time.
- DQDon Q.Verified BuyerReviewingSiemens Q3100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/14/26Siemens breaker
Great customer experience, great prices and fast shipping... Definitely will be buying her again.
- CSChristopher S.Verified BuyerRated 5 out of 5 stars8/12/26Siemens 60
Perfect new condition