SIEMENS
SIEMENS Q320 Miniature Circuit Breaker 20A 3 Pole 240V AC 10kA
Three-pole miniature circuit breaker rated 20 A at 240 V AC with a 10 kA interrupting capacity, plug-in mounting for Siemens EQ load centres
- 20 A three-pole protection for 240 V AC three-phase circuits
- 10 kA interrupting rating clears faults quickly and safely
- Plug-in mounting fits Siemens EQ load centres without extra hardware
- Toggle actuator gives clear on/off indication at a glance
- Accepts 14 to 8 AWG copper conductors for flexible wiring
Three-Pole Protection for 20 A Circuits
The SIEMENS Q320 is a miniature circuit breaker rated 20 A at 240 V AC with a 10 kA interrupting capacity at 120 V AC. It is designed for three-phase loads in Siemens EQ load centres and suits electricians or facility managers adding or replacing branch-circuit protection.
Plug-In Mounting with Lug Terminals
The breaker uses a plug-in mounting style that fits directly into compatible EQ panelboards, secured by a toggle actuator. Lug terminals accept copper conductors from 14 AWG up to 8 AWG, and the 125 A frame size ensures consistent dimensions across the Q series for straightforward panel layout.
Replaces Standard 20 A Three-Pole Breakers
This unit upgrades or replaces existing standard 20 A three-pole breakers in the same series when a 10 kA rating is required. The jump is worth it when the available fault current exceeds the rating of the original device or when panel standardisation on the Q series simplifies spare-part management.
Highlights
- 20 A three-pole protection for 240 V AC three-phase circuits
- 10 kA interrupting rating clears faults quickly and safely
- Plug-in mounting fits Siemens EQ load centres without extra hardware
- Toggle actuator gives clear on/off indication at a glance
- Accepts 14 to 8 AWG copper conductors for flexible wiring
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
What does the 10 kA AIR rating at 120 V AC limit in practice?
The 10 kA interrupting rating means the breaker can safely clear faults up to 10 000 amps at 120 V AC; above that level it may not interrupt cleanly.
What panel space and mounting style does the 3-pole Q320 require?
It uses a plug-in mounting style and fits Siemens EQ load centres; the frame occupies three poles and measures 3.4 in long, 3.7 in wide and 12.8 in deep.
How is the Q320 installed and which wiring step is often missed?
Snap the breaker into the EQ load centre bus stabs, then torque the lug terminals onto conductors between 14 AWG and 8 AWG; the torque step is frequently overlooked.
Also in this aisle
People compared these
Same shelf, same checkout — eight coins and a 30-minute rate lock.
