| Ambient operating temperature | -20 to 60°C (with no condensation or icing) |
| Storage temperature | -25 to 65°C (with no condensation or icing) |
| Altitude | 2,000 m max. |
| Input frequency | 50/60 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. 130 g |
| Rated input voltage | K8AK-PA1 | 3-phase, 3-wire mode: 200, 220, 230, 240 VAC, 3-phase, 4-wire mode: 115, 127, 133, 138 VAC |
| K8AK-PA2 | 3-phase, 3-wire mode: 380, 400, 415, 480 VAC, 3-phase, 4-wire mode: 220, 230, 240, 277 VAC |
| Asymmetry operation (ASY.) | Operating value setting range | Asymmetry rate: 2% to 22% |
| Operating value | 100% operation at set value Asymmetry operating value = rated input voltage x asymmetry set value [%] The asymmetry operation will function when the difference between the highest and lowest voltage phases equals or exceeds the asymmetry operating value |
| Reset (HYS.) | Hysteresis | 5% of operating value (fixed) |
| Resetting method | Automatic reset |
| Operating time (T) | Asymmetry | 0.1 s to 30 s |
| Phase-sequence, phase-loss | 0.1 s max. |
| Power ON lock (LOCK) | 1 s or 5 s (Changed with the DIP switch) |
| Overload capacity | Continuous input at 115% of maximum input, 10 s at 125% (up to 600 VAC) |
| Repeat accuracy | Operating value | ±0.5% full scale (at 25°C and an ambient humidity of 65% at the 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) |
| Indicators | Power (PWR): Green LED, relay output (RY): Yellow LED, alarm outputs (ALM 1/2): 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 |
