Siemens 3WL1110-2DG32-1AA4

The 3WL1110-2DG32-1AA4 is a fixed-mounted air circuit breaker from Siemens SENTRON 3WL series, frame size I, rated at 1000A and 690V AC for low voltage power distribution. This 3WL1110-2DG32-1AA4 is equipped with ETU electronic trip unit supporting LSIG protection functions including overload, short-circuit short-time delay, instantaneous short-circuit and earth fault protection for transformers, main incoming feeders and bus tie circuits. The 3WL1110-2DG32-1AA4 adopts rear horizontal busbar connection layout and solid fixed mounting structure without withdrawable cradle.

This 3WL1110-2DG32-1AA4 supports optional communication modules for Modbus, enabling remote monitoring, power measurement and fault event upload to SCADA and energy management platforms. The 3WL1110-2DG32-1AA4 comes with spring stored-energy operating mechanism, supporting local manual operation and remote electrical closing and tripping. Built-in diagnostic functions record trip history and fault codes to accelerate troubleshooting after electrical faults. The suffix 1AA4 defines the standard accessory configuration of this breaker variant.

The 3WL1110-2DG32-1AA4 is widely used as main incoming or bus coupler breaker in industrial substations, power plants, data centers and large commercial distribution switchboards. The SENTRON 3WL platform has been superseded by the newer 3WA series, and original production of this 3WL1110-2DG32-1AA4 is discontinued. Most available units are tested surplus spare parts for retrofit and emergency replacement of existing SIVACON low voltage panels.