| Ambient operating temperature | -20 to 60°C (with no condensation or icing) |
| Storage temperature | -25 to 65°C (with no condensation or icing) |
| Operating voltage range | 85% to 110% of rated operating voltage |
| Rated power supply frequency | 50/60 Hz±5 Hz (AC power supply) |
| Output relays
(1 × SPDT, normally closed operation) | Resistive load | 5 A at 250 VAC or at 30 VDC |
| Maximum contact voltage | 250 VAC or 30 VDC |
| Maximum contact current | 5 A |
| Maximum switching capacity | 1,250 VA, 150 W |
| Mechanical life | 10,000,000 operations |
| Electrical life | 50,000 operations at 5 A, 250 VAC or 30 VDC |
| Degree of protection | Terminal section: IP20 |
| Case material | PC and ABS |
| Weight | Approx. 150 g |
| Operating power | Isolated power supply | 2.0 VA/1.1 W max. at 24 VAC/DC, 4.6 VA max. at 100 to 240 VAC |
| Operate (SV) | Operating value setting range | 10% to 100% of maximum measuring current |
| Operating value | 100% operation at set value |
| Reset (HYS.) | Hysteresis | 5% to 50% of operating value |
| Resetting method | Manual reset/automatic reset (switchable)
Manual reset: Turn OFF operating power for 1 s or longer |
| Operating time (T) | 0.1 to 30 s |
| Operating power ON lock (LOCK) | 0 to 30 s (The startup lock timer starts when the input has reached approximately 30% or more of the set value.) Note: Enabled only for overcurrent operation |
| Repeat error | Operating value | ±0.5% full scale (at 25°C and 65% humidity, rated power supply voltage, DC or 50/60 Hz sine wave input) |
| Operating time | ±50 ms (at 25°C and 65% humidity, rated power supply voltage) |
| Input frequency range | K8AK-AS1/-AS2 | DC input or AC input (45 to 65 Hz) |
| K8AK-AS3 | AC input (45 to 65 Hz) |
| Overload capacity | K8AK-AS1/-AS2 | Continuous input at 120% of maximum input, 1 s at 150% |
| K8AK-AS3 | Continuous input at 120%, 30 s at 200%, and 1 s at 600% with an OMRON CT (K8AC-CT200L) |
| Indicators | Power (PWR): Green LED, relay output (RY): Yellow LED, alarm outputs (ALM): Red LED |
| Applicable standards | Conforming standards | EN 60947-5-1
Installation environment (pollution level 2, installation category III) |
| EMC | EN 60947-5-1 |
| Safety standards | UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA and CCC |
| Size in mm (H × W × D) | 90 × 22.5 × 100 |
