Asea Brown Boveri TDR4B12 Time Delay Relay Module

The ABB TDR4B12 Time Delay Relay Module is a compact timing relay in ABB’s TDR family that provides a controlled delay in electrical control circuits. When its input is activated, the output state changes after a user-defined interval, enabling sequencing, interlocks, and startup delays in industrial automation applications. As part of ABB’s timer-relay lineup, the TDR4B12 is designed for integration into standard control panels and logic circuits where repeatable timing behavior is required. The model designation indicates a specific variant within the TDR range, with timing characteristics determined by the installation configuration and documented in ABB specifications. Typical use cases include coordinating multi-step machine operations, delaying a downstream signal to ensure safe ramping of actuators, and creating dwell times to prevent premature activations in automation sequences.