The Square D AMP BOLT-ON CIRCUIT BREAKER 3 POLE 480Y/277 VAC EJB34030 is a circuit protection device from Square D. It serves as the protective device in an electrical circuit, stopping current flow when a fault is detected. Key specifications noted on this listing include 277 VAC, 30 AMP, 3 POLE. It is commonly in power distribution panels and industrial control circuits.
