Siemens LGB1B020B U Molded Case Circuit Breaker

Siemens LGB1B020B U molded‑case circuit breaker is a 1‑pole, 20‑A device rated for 277 V AC. It belongs to the LGB family of low‑voltage molded‑case breakers and uses a thermal‑magnetic trip to provide overload protection and instantaneous fault protection. With a 65 kA short‑circuit interrupt rating at 277 V, this MCCB is designed to safely interrupt high‑energy faults in branch circuits of commercial and light‑industrial power distribution. The compact LGB frame supports protection for single‑phase loads in distribution equipment where Siemens LGB devices are specified, and its 20 A rating aligns with typical conductor sizing and upstream protection. The LGB1B020B U variant represents Siemens' 277 V, 20 A, 1‑pole option in the LGB line, offering reliable, proven performance for 277 V installations.