Industrial TDBL 120ALD Timer Delay Relay

The Littelfuse Digi-Set TDBL120ALD Timer Delay Relay is a 120 VAC delay‑on‑break timer with DPDT (2 Form C) contacts in an 11‑pin plug‑in package, rated for 10 A. It uses DIP‑switch selectable time ranges that cover 0.1 seconds up to 10,230 seconds across three ranges, giving precise control for sequencing in control panels and OEM installations. Timing is initiated by applying input voltage and an initiate signal; the output energizes on closure of the initiate switch, and the timing countdown begins on the trailing edge when the initiate switch is opened. The output remains energized during the delay, then de‑energizes at the end of the interval, with the possibility of re‑energizing if the initiate signal is applied again with power present. A built‑in LED indicates timing activity, and the unit specifies timing accuracy of about ±0.1% repeat and ±2% setting accuracy. The TDBL120ALD is designed for reliable operation in 50/60 Hz environments and is well suited for applications requiring precise sequencing—such as interlocks, machine control, and process automation—in industrial control panels and OEM designs.