SIEMENS Q330 Miniature Circuit Breaker 30A 3 Pole 240V AC 10kA

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.