Siemens QG320 Miniature Circuit Breaker
- 20A
- 3 Pole
- Plug-On
Siemens
QG320
Miniature Circuit Breaker
Brand
Siemens
SKU
QG320
Quantity
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Siemens QG320 - 20A 3 Pole Miniature Circuit Breaker
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20A 3 Pole Miniature Circuit Breaker
20A 3 Pole Miniature Circuit Breaker
Description
Built for commercial and industrial safety, the Siemens QG320 delivers 20A of protection across three poles, equipped with a switching neutral. This configuration safely disconnects two hot lines and the neutral conductor simultaneously, which is frequently required for fuel dispensing equipment. The breaker mounts into Siemens EQ, PL, ES, and Ultimate load centers. It also functions as an exact replacement for the legacy MP320SN. Rated for 10kAIC at 120/240VAC, it includes HACR certification.Specifications
| Brand | Siemens |
|---|---|
| Series | QG |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens EQ, PL, ES, Ultimate Load Centers |
| Wire Gauge | 14-6 AWG (Cu/Al) |
| Max Wire | 6 AWG |
| Min Wire | 14 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, UL |
| Temp Rating | 40C |
| Construction Features | Switching Neutral, Common Trip, HACR Rated |
| Special Features | Switching Neutral |
Product FAQs
6 answersCan the Siemens QG320 replace older Murray or ITE breakers?
Yes, this breaker serves as a direct replacement for the legacy Murray and ITE MP320SN switching neutral circuit breakers.
Which load centers are compatible with the QG320?
This plug-on breaker is designed for installation in Siemens EQ, PL, ES, and Ultimate series load centers.
What is the primary application for a switching neutral breaker?
Switching neutral breakers are frequently required for fuel dispensing equipment, such as gas pumps, where electrical codes mandate simultaneously disconnecting all hot lines and the grounded neutral conductor.
How does the 3-pole configuration function on this specific breaker?
It is configured as a switching neutral breaker. It safely disconnects two ungrounded (hot) conductors and the grounded (neutral) conductor simultaneously to ensure complete circuit isolation during maintenance or a fault.
Is the QG320 suitable for HVAC applications?
Yes, this breaker carries an HACR certification, making it approved for use with compatible heating, air conditioning, and refrigeration equipment.
Does this breaker include ground-fault or arc-fault protection?
No, this is a standard thermal-magnetic breaker providing overload and short-circuit protection. It does not contain GFCI or AFCI circuitry.
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