SIEMENS
SIEMENS Q330 Miniature Circuit Breaker 30A 3 Pole 240V AC 10kA
Three-pole miniature circuit breaker rated 30 A at 240 V AC with a 10 kA interrupting capacity for Siemens EQ load centres
- Protects three-phase circuits with a 30 A rating
- Interrupts fault currents up to 10 kA at 120 V AC
- Fits Siemens EQ load centres via plug-in mounting
- Accepts wire sizes from 14 AWG to 8 AWG
- Compact 3-inch frame simplifies panel installation
Three-Pole Protection for 30 A Circuits
This SIEMENS Q Series miniature circuit breaker delivers three-pole overcurrent protection at 30 A and 240 V AC for use in Siemens EQ load centres. It plugs directly onto the panel bus for straightforward installation in residential or light-commercial three-phase distribution. The 10 kA interrupting rating at 120 V AC provides reliable fault clearing for standard branch circuits. Electricians and facility managers specifying EQ-series panels will find it matches the required frame size and pole configuration.
Sustained Load Behaviour
The thermal-magnetic trip mechanism responds to prolonged overloads without nuisance tripping during normal motor starts or transformer inrush. Under continuous 30 A loading the device runs within its 125 A frame thermal limits, maintaining stable contact resistance across the lug terminals rated for 14 to 8 AWG conductors. The 10 kA short-circuit rating ensures the breaker opens decisively when fault currents exceed normal operating levels, protecting downstream wiring and equipment.
Plug-In Mounting and Lug Terminals
The plug-in mounting style locks the breaker onto the EQ panel bus without bolts, reducing installation time and ensuring positive electrical contact. Front-mounted toggle actuator gives clear on-off indication and manual reset after a trip. Lug terminals accept solid or stranded copper wire from 14 AWG up to 8 AWG, accommodating typical branch-circuit conductor sizes. The three-inch square footprint fits standard EQ load centre cavities, so no panel modifications are required.
Highlights
- Protects three-phase circuits with a 30 A rating
- Interrupts fault currents up to 10 kA at 120 V AC
- Fits Siemens EQ load centres via plug-in mounting
- Accepts wire sizes from 14 AWG to 8 AWG
- Compact 3-inch frame simplifies panel installation
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
Does the 30 A, 3-pole Q330 breaker generate noticeable heat or noise when it runs continuously at full load?
The Q330 is a standard thermal-magnetic breaker with no moving parts except the toggle; it produces no audible noise and only normal warm-up at its 30 A rating.
What panelboard or load center must I already have for this plug-in breaker to fit and connect?
It is designed exclusively for Siemens EQ load centres that accept the Q-series 125 A frame plug-in format.
Will the Q330 coordinate with older 10 kA breakers already installed in the same Siemens EQ panel?
Yes, its 10 kA interrupting rating at 120 V AC matches the legacy breakers, so selective tripping behaviour remains consistent.
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