The PSB 25T/12 is a series of three-phase thyristor power controllers manufactured by Powersem. It is designed to regulate the output current of a three-phase power system by controlling the firing angle of the thyristors. It features a modular design for easy installation, as well as internal standby diodes for fail-safe operation. The device also has safety approvals for CE, LCIE, IP00 protection, and UL, CSA, and TUV listed. It also includes a digital display for monitoring the instantaneous output current, as well as a sleep mode for improved efficiency.