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To ensure accuracy, please note that images may be representative. Refer to the product data sheet for detailed specifications.
| Manufacturer | ATC Diversified |
| Manufacturer Product Number | AC-2020 |
| Description | Phase Monitor Relay; 3-Phase; Surface Mount |
| Datasheet | Download Datasheet |
The ATC Diversified AC-2020 is a 3-phase compressor protector. It drops its output out on a lost or reversed phase or an under or over voltage, and its anti-short-cycle delay keeps the compressor from restarting too soon.
Input: 190-270 V AC or 380-540 V AC, auto ranging. Control supply: 24 or 120 V AC ±10%, 50/60 Hz. Trip points: undervoltage 10% below the setting (5% hysteresis); overvoltage 10% above the setting. Trip delay: phase loss / reversal 2 s; undervoltage 2 s. Restart: 0.05-5 min adjustable delay on make (auto mode); 3 min fixed delay on break (delay mode). Reset: automatic or manual, with or without memory.
Output: SPST-NO control + SPDT auxiliary, 9 A general purpose; B300 (360 VA). Mounting: surface mount, screw Terminal (12 x #8-32). Indicator: LEDs for range, over and under voltage, phase loss, phase reversal, normal / timing. Approvals: cURus Recognized (E55826). It operates from -20 to +55 °C and stores from -40 to +85 °C.
| Category | |
| Manufacturer | ATC Diversified |
| Model | AC |
| Monitoring Function | Phase Loss, Phase Reversal, Undervoltage and Overvoltage, with anti-short-cycle delay |
| Special Application | 3-phase compressor protection (HVAC) |
| Number of Phases | 3-Phase |
| Input Voltage | (190...270)V AC or (380...540)V AC, auto ranging |
| Control Supply Voltage | 24 or 120 V AC ±10%, 50/60 Hz |
| Undervoltage Trip Range | 10% below the setting (5% hysteresis) |
| Overvoltage Trip | 10% above the setting |
| Restart Delay (s) | 0.05-5 min adjustable delay on make (auto mode); 3 min fixed delay on break (delay mode) |
| Trip Delay - Phase Loss and Reversal (ms) | 2 s |
| Trip Delay - Undervoltage (s) | 2 s |
| Reset Method | Automatic or manual, with or without memory |
| Status Indicator | LEDs for range, over and under voltage, phase loss, phase reversal, normal / timing |
| Contact Configuration | SPST-NO control + SPDT auxiliary |
| Output Rating | 9 A general purpose; B300 (360 VA) |
| Mounting Type | Surface Mount |
| Termination Style | Screw Terminal (12 x #8-32) |
| Operating Temperature (Storage) | -20...+55 °C (-40...+85 °C) |
| Approvals | cURus Recognized (E55826) |