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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-301-230 |
| Description | Phase Monitor Relay; 3-Phase; (190...270)V AC; 10 A at 120 V AC |
| Datasheet | Download Datasheet |
The ATC Diversified AC-301-230 is a 3-phase over/under voltage monitor for 190-270 V AC systems. It drops its output relay out on phase loss, phase reversal and undervoltage; also drops out on power failure or thermostat interruption and resets once the fault clears.
Control supply: Universal output for 24, 120 or 208/240 V AC control circuits (built-in thermostat bypass). Trip points: undervoltage 158-224 V AC (one phase low); 171-243 V AC (all three phases low). Adjustment: tracks the adjustment setting (one phase below 83% or all three below 90%); picks up 1 V above drop-out. Trip delay: phase loss / reversal 0.5 s; undervoltage 0.5 s. Restart: 0.2-8 min adjustable (delay on make). Reset: automatic (after the delay).
Mounting: surface mount, #8-32 screw terminals. Indicator: Green LED glows when voltages are normal; red LED glows when the relay picks up. It operates from -40 to +66 (-40 to +150 °F) °C and stores from -40 to +88 (-40 to +190 °F) °C.
| Category | |
| Manufacturer | ATC Diversified |
| Model | AC-301 |
| Monitoring Function | Phase Loss, Phase Reversal and Undervoltage; also drops out on power failure or thermostat interruption |
| Special Application | 3-phase compressor short-cycle protector (HVAC) |
| Number of Phases | 3-Phase |
| Input Voltage | (190...270)V AC |
| Control Supply Voltage | Universal output for 24, 120 or 208/240 V AC control circuits (built-in thermostat bypass) |
| Undervoltage Trip Range | 158-224V AC (one phase low); 171-243V AC (all three phases low) |
| Undervoltage Trip Adjustment | Tracks the adjustment setting (one phase below 83% or all three below 90%); picks up 1 V above drop-out |
| Restart Delay (s) | 0.2...8 min adjustable (delay on make) |
| Trip Delay - Phase Loss and Reversal (ms) | 0.5 s |
| Trip Delay - Undervoltage (s) | 0.5 s |
| Reset Method | Automatic (after the delay) |
| Status Indicator | Green LED glows when voltages are normal; red LED glows when the relay picks up |
| Output Rating | 10 A at 120 V AC |
| Mounting Type | Surface Mount |
| Termination Style | Screw Terminal (#8-32) |
| Dimensions | 4 x 4 x 3.6 in H (Style E) |
| Operating Temperature (Storage) | -40...+66 (-40 to +150 °F) °C (-40...+88 (-40 to +190 °F) °C) |