Siemens 6ES7307-1BA01-0AA0 Power Supply Module

Siemens 6ES7307-1BA01-0AA0 is the PS 307 DIN-rail mounted switched‑mode power supply for SIMATIC S7‑300 PLCs, providing a regulated 24 V DC output at up to 2 A (48 W) from a universal 120/230 V AC input. The module's isolated output helps protect the PLC and I/O circuits from mains disturbances, supporting reliable operation in automation cabinets. It is designed for DIN‑rail installation and carries an IP20 enclosure rating suitable for indoor electrical panels. Efficiency is typically around 84%, contributing to lower heat generation in compact control enclosures. For systems requiring higher current, the PS 307 family allows parallel wiring to increase available output, a feature that can simplify scalability in multi‑card CPU configurations. Key protections include electronic short‑circuit protection (non‑latching), which helps safeguard the PSU and connected modules during fault conditions. In practice, this 24 V DC, 2 A supply is used to power the S7‑300 CPU and peripheral modules within the same rack, ensuring a stable supply rail for reliable PLC operation without needing external adapters or multiple regulators. This specific model, 6ES7307-1BA01-0AA0, is the 24 V, 2 A variant of the PS 307 line, widely documented in Siemens product catalogs and third‑party distributors as a compact, interchangeable power source for legacy S7‑300 installations.