Siemens NGB3B070 Bolt On Circuit Breaker

Siemens NGB3B070 is a VL Series bolt-on, three-pole molded‑case circuit breaker designed for panelboard mounting in 3‑phase electrical distributions. It provides 70 A protection for three‑phase circuits and is rated up to 600 V AC, with an interrupting capacity of 25 kA at 480 V, enabling reliable short‑circuit interruption in industrial and commercial 480 V systems. This thermal‑magnetic device offers long‑time and instantaneous trip functions, helping to coordinate protection and quickly clear faults. The bolt‑on mounting and NGB frame make it suitable for addition to compatible Siemens panels in retrofit or new installations. UL489 listing confirms compliance for industrial power distribution, and standard load‑side lug configurations support common panelboard wiring. For exact panel compatibility and lug options, verify the catalog designation (such as NGB3B070B) and consult the Siemens Industry Mall or a Siemens distributor datasheet to confirm mounting hardware and lug arrangements. In typical applications, it serves as main or branch protection in 3‑phase distribution panels and motor control centers where 70 A protection at up to 480 V is required.