Siemens NGB3B030 Circuit Breaker

No. While the NGB3B030 is designed for use in Siemens P1, P2, and P3 panelboards, a P1 panel configured for NGB branch breakers cannot accept BL or BQD frame breakers. P1 panels must be dedicated to either NGB frames or BL/BQD frames, and they cannot be mixed in the same panel.

This 3-pole circuit breaker requires 3 inches of branch unit space in your panelboard. Each pole takes up 1 inch of width on the panelboard bus.

Yes, it is designed with an over-center toggle mechanism that is completely trip-free. If a short circuit or overcurrent condition occurs, the contacts are mechanically forced apart, and the breaker cannot be manually held closed by forcing the handle.

Yes, this breaker is reverse feed rated. It can be utilized as an incoming main or a branch breaker in power distribution systems, provided the installation complies with your local electrical codes.

Yes, the NGB3B030 is HACR rated for use with heating, air conditioning, and refrigeration equipment. It is also HID rated for switching high-intensity discharge lighting circuits.

The NGB frame is a heavier-duty alternative to the BQD series, offering a 600V AC maximum voltage rating and a higher interrupting capacity (25kAIC at 480V AC). NGB breakers are specified for industrial environments that exceed the voltage or short-circuit limits of standard BQD branch breakers.

Yes. Unlike many commercial branch breakers that are strictly AC-rated, the NGB3B030 is dual-rated. It can safely interrupt up to 14kAIC in 125/250V DC applications, making it versatile for mixed power systems.

No, this breaker utilizes a thermal-magnetic trip unit with fixed thermal and fixed magnetic settings. It provides standard long-time and instantaneous (LI) overcurrent protection that is factory calibrated, meaning there are no dials or switches for field adjustments.