Square D EJB34050 Miniature Circuit Breaker

This E-frame breaker is designed exclusively for use in Square D NF series panelboards. It requires three breaker spaces and utilizes a bolt-on mounting connection to secure directly to the bus.

These E-frame breakers share the same physical dimensions and fit the same NF panelboards, but they feature different short-circuit interrupting ratings at 480Y/277V. The EDB is rated for 18 kAIC, the EGB for 35 kAIC, and the EJB provides the highest protection level at 65 kAIC.

The aluminum lugs require specific tightening torque depending on the conductor size used. For 14 to 10 AWG wire, torque the terminals to 34.5 lb-in. For 8 to 2/0 AWG wire, torque to 49.6 lb-in.

Yes, the EJB34050 is both HACR rated for heating, air conditioning, and refrigeration equipment, and HID rated for high-intensity discharge lighting circuits.

This thermal-magnetic breaker has a magnetic hold rating of 630A and a magnetic trip rating of 1800A. This means it will safely hold inrush currents up to 630A without nuisance tripping, while instantly clearing faults that reach 1800A.

Yes, it features the Square D Visi-Trip indicator. When an overload or short circuit occurs, the handle snaps to a center position and displays a highly visible red flag, allowing personnel to quickly identify the tripped circuit in a crowded panelboard.