Littelfuse TDM24AL, TDM Series, Delay On Make Timer, 24VDC, 1–1023s Time Setting, 8 Pins, DPDT Contact Form
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The TDM/TDMH/TDML series is a delay-on-make timer that combines accurate digital circuitry with isolated, DPDT relay contacts in an industry standard 8-pin plug-in package. DIP switch adjustment allows precise selection of the time delay over the full time delay range. The TDM/TDMH/TDML series is the product of choice for custom control panel and OEM designers.
Operation (Delay-on-Make)
Upon application of input voltage, the time delay begins. The output is de-energized before and during the time delay. At the end of the time delay, the output relay energizes and remains energized until input voltage is removed.
Reset: Removing input voltage resets the time delay and 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, or 110 V dc; 24, 120, or 230 V ac |
| Tolerance |
12 V dc & 24 V dc/ac -15 %–20 % 110 V ac/dc to 230 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) |