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To ensure accuracy, please note that images may be representative. Refer to the product data sheet for detailed specifications.
| Manufacturer | SSAC / Littelfuse |
| Manufacturer Product Number | TRDU120A1 |
| Description | Time Delay Relay; 0.1 s...1705 h; DIP; 120V AC; 9 functions, 8-pin DPDT |
| Datasheet | Download Datasheet |
The Littelfuse SSAC TRDU120A1 is a digital multi-function timer for 120 V AC, with isolated DPDT relay contacts rated 10 A resistive at 120/240 V AC and 28 V DC. Its delay is adjustable from 0.1 seconds to 1705 hours with DIP switches.
21 timing functions selected with five switches on the face, ranges and multipliers set on DIP switches. One TRDU replaces up to three single-function timers.
Output: 2C DPDT relay, 10 A resistive at 120/240 V AC and 28 V DC; 1/3 hp at 120/240 V AC (isolated contacts), 9 functions, 8-pin dpdt. Indicator: Two LEDs: input voltage applied, output relay energized. Repeat accuracy: ±0.1% or 20 ms, whichever is greater. Setting accuracy: ±1% or 50 ms, whichever is greater; ±1% over temperature and voltage. Reset time: 50 ms. Supply tolerance: -20% / +10% of nominal; 50/60 Hz. Power: 3 W max. Life: 10,000,000 operations mechanical, 1,000,000 electrical.
It plugs into an 8 pin octal socket. It operates from -20 to +65 °C and stores from -40 to +85 °C.
| Category | |
| Manufacturer | SSAC / Littelfuse |
| Model | TRDU |
| Output Technology | Electromechanical Relay |
| Timing Function | Multi-Function |
| Delay Time | 0.1 s...1705 h |
| Time Ranges | Single functions 0.1 s - 1,705 h in 8 ranges; dual functions 0.1 s - 3,100 min each |
| Timing Adjustment Method | DIP switches, digital set |
| Options | 9 functions, 8-pin DPDT |
| Timing Initiate Method | Input Voltage or Control Switch, by function |
| Available Timing Functions | 9 (8-pin DPDT build): Delay on make, delay on break, single shot, recycle (ON first, equal delays) and more single functions; delay on make / delay on break, delay on make / interval, delay on make / recycle, delay on make / single shot and other dua |
| Status Indicator | Two LEDs: input voltage applied, output relay energized |
| Contact Configuration | 2C DPDT |
| Output Rating | 10 A resistive at 120/240 V AC and 28 V DC; 1/3 hp at 120/240 V AC (isolated contacts) |
| Input Voltage | 120V AC |
| Termination Style | Plug In |
| Mounting Type | Socketable |
| Socket Family | 8 Pin Octal |
| Operating Temperature | -20...+65 °C (-40...+85 °C) |
| Setting Accuracy (%) | ±1% or 50 ms, whichever is greater; ±1% over temperature and voltage |
| Repeatability (%) | ±0.1% or 20 ms, whichever is greater |
| Recovery Time (ms) | 50 |
| Mechanical Life | 10,000,000 cycles (1,000,000 cycles) |
| Input Operating Range | -20% / +10% of nominal; 50/60 Hz |
| Rated Power | 3 W max |