Product Description

The Omron K8AB-PA2 is a three-phase asymmetry and phase-sequence phase-loss relay designed to monitor three-phase power supplies in industrial settings. It effectively detects voltage asymmetry, phase sequence errors, and phase loss, ensuring the protection of motors and other equipment from potential damage due to electrical supply issues. The device features a single SPDT relay output rated at 6 A for resistive loads at 250 VAC, providing reliable alarm signaling. It supports worldwide power specifications, with selectable input voltages of 380, 400, 415, or 480 VAC for three-phase, three-wire mode, and 220, 230, 240, or 277 VAC for three-phase, four-wire mode. The K8AB-PA2 is DIN rail mountable and offers adjustable settings for asymmetry detection (2% to 22%), operating time (0.1 to 30 seconds), and reset value (5% to 50% of the operating value).

Technical Specifications

• Model: K8AB-PA2​
• Function: Three-phase asymmetry and phase-sequence phase-loss monitoring​
• DigiKey
• +5
• TME
• +5
• Omron KFT
• +5
• Input Voltage:
• Three-phase, three-wire mode: 380, 400, 415, or 480 VAC​
• ALLDATASHEET.COM
• +3
• Omron KFT
• +3
• TME
• +3
• Three-phase, four-wire mode: 220, 230, 240, or 277 VAC​
• ALLDATASHEET.COM
• +3
• Omron KFT
• +3
• TME
• +3
• Input Load: Maximum 45 VA​
• Operating Value (Asymmetry Detection): Adjustable between 2% and 22% of the rated input voltage​
• Omron KFT
• +1
• TME
• +1
• Reset Value: Adjustable between 5% and 50% of the operating value​
• Omron KFT
• +1
• TME
• +1
• Operating Time (Asymmetry): Adjustable from 0.1 to 30 seconds​
• TME
• +3
• Omron KFT
• +3
• TME
• +3
• Phase Sequence/Phase Loss Detection Time: Maximum 0.1 second​
• Startup Lock Time: Selectable between 1 second or 5 seconds via DIP switch​
• Omron KFT
• +1
• TME
• +1
• Output Relay:
• Type: SPDT (1 Form C)​
• Omron
• +3
• DigiKey
• +3
• Mouser Electronics
• +3
• Contact Rating: 6 A at 250 VAC (resistive load)​
• DigiKey
• +7
• RS Components
• +7
• TME
• +7
• Maximum Contact Voltage: 250 VAC​
• Omron KFT
• +3
• TME
• +3
• RS Components
• +3
• Maximum Contact Current: 6 A AC​
• DigiKey
• +5
• RS Components
• +5
• TME
• +5
• Indicators:
• Power (PWR): Green LED​
• RS Components
• +2
• Omron KFT
• +2
• TME
• +2
• Relay Output (RY): Yellow LED​
• Omron
• +3
• TME
• +3
• RS Components
• +3
• Alarm Outputs (ALM): Red LED​
• TME
• +2
• Omron KFT
• +2
• RS Components
• +2
• Mounting: DIN rail​
• Omron
• +1
• Mouser Electronics
• +1
• Dimensions: 22.5 mm (W) x 90 mm (H) x 100 mm (D)​
• TME
• Operating Temperature: -20°C to 60°C (with no condensation or icing)​
• Omron
• +1
• DigiKey
• +1
• Storage Temperature: -40°C to 70°C (with no condensation or icing)​
• Weight: Approximately 120 grams​