Siemens LGB3B020B U Three-Phase Circuit Breaker

Siemens LGB3B020B U is a three-pole, low-voltage molded-case circuit breaker in the LGB/G-frame family, intended for panelboard mounting and rated for 20 A at up to 480 V AC. It provides thermal-magnetic overcurrent protection with long-time and instantaneous trip functions and arrives with load lugs installed for straightforward wiring. The device is UL 489-listed and built to interrupt fault currents in three-phase feeders and branch circuits, offering a 65 kAIC short-circuit rating at 480 V (480Y/277 V) and a 14 kAIC rating at 600 V systems (600Y/347 V). This combination of rating and trip characteristics makes it suitable for protecting commercial and light-industrial panelboard circuits against overloads and short circuits. The LGB frame designation denotes a compact, panelboard-oriented MCCB design that fits Siemens' panel offerings and accepts standard mounting configurations for reliable, code-compliant protection in protected distribution systems.