Littelfuse TDI120AL, TDI series, Interval Timer, 120VAC, 1–1023s Time Setting, 8 Pins, DPDT Contact Form
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The TDI series is an interval timer that combines accurate digital circuitry with isolated, 8 A rated, DPDT relay contacts in an 8-pin plug-in package. The TDI series features DIP switch selectable time delays ranging from 0.1 to 10,230 seconds in three ranges. The TDI series is the product of choice for custom control panel and OEM designers.
Operation (Interval)
Upon application of input voltage, the time delay begins. The output relay is energized during the time delay. At the end of the time delay, the output de-energizes and remains de-energized until input voltage is removed.
Reset: Removing input voltage resets the time delay and the output.
*UL Listed when used with Part Number OT08-PC or RB08-PC manufactured by Custom Connector Corp.
Note: : Manufacturer's recommended screw terminal torque for the OT Series sockets is 12 in-lbs.
| Time Delay | |
| Type | Digital integrated circuitry |
| Range |
0.1–102.3 s in 0.1 s increments 1–1023 s in 1 s increments 10–10,230 s in 10 s increments |
| Repeat Accuracy | ±0.1 % |
| Setting Accuracy | ±2 % |
| Reset Time | ≤ 150 ms |
| Time Delay vs Temp. & Voltage | ±5 % |
| Indicator | LED glows during timing; relay is energized |
| Input | |
| Voltage | 12, 24/28 V dc; 24, 120 V ac |
| Tolerance |
12 V dc & 24 V dc/ac -15 %–+20 % 120 V ac -20 %–+10 % |
| AC Line Frequency | 50/60 Hz |
| Power Consumption | ≤ 3.25W |
| Output | |
| Type | Electromechanical relay |
| Form | DPDT |
| Rating |
8 A resistive @ 120/240 V ac; 1/3 hp @ 120/240 V ac |
| Life | Mechanical - 1 x 10⁷ ; Electrical - 1 x 10⁶ |
| Protection | |
| Isolation Voltage | ≥ 1500 V rms input to output |
| Polarity | Dc units reverse polarity protected |
| Mechanical | |
| Mounting | Plug-in socket |
| Dimensions |
H 44.45 mm (1.75”); W 60.33 mm (2.38”); D (with socket) 104.78 mm (4.13”) |
| Termination | Octal 8-pin plug-in |
| Environmental | |
| Operating/Storage Temperature | -20 °C to 65 °C / -30 °C to 85 °C |
| Safety Marks UL (socket required)* | UL 508 (E57310) |
| Weight | ≅ 4 oz (113 g |