Siemens NGG3B030L Three-Phase Circuit Breaker

Siemens NGG3B030L is a 30-amp, three-pole molded-case circuit breaker in the NGG G-frame, designed for three-phase protection in electrical panels and MCCs. It is UL 489 listed and uses a thermal-magnetic trip mechanism to provide overcurrent protection for feeders and motors, with line and load lug terminals included for straightforward panelboard or equipment enclosure mounting. The device is rated for up to 480 VAC line-to-line, and offers an interrupt capacity of 25 kAIC at 480 V and 14 kAIC at 600Y/347 V, making it suitable for fault-current scenarios common in industrial power systems. Siemens cataloging places this part as NGG3B030L within the low-voltage NGG family, a 3-pole, 30-A protection option in 3-phase distribution. Typical applications include protection of three-phase feeders to motors, transformers, and distribution panels in commercial and light industrial environments where reliable, code-compliant overcurrent protection is required. This model is compatible with Siemens NGG components in existing installations and is commonly used for panelboard distribution and motor control applications.