Omron K8AK-PM Series Voltage/Current Monitoring Components
The Omron K8AK-PM Series is a compact, high-reliability voltage and current monitoring relay designed to protect equipment from abnormal supply conditions. With precise detection, adjustable thresholds, and multiple output options, it’s ideal for monitoring single-phase and three-phase power systems in industrial control panels.
Categories:
Panel ComponentsKey Features
- High resistance to inverter noise for stable operation
- Monitors overvoltage, undervoltage, phase sequence, and phase loss for 3-phase 3-wire or 4-wire systems in a single unit
- Switch-selectable for 3-phase 3-wire or 4-wire power supply
- Two independent SPDT output relays (5 A at 250 VAC resistive) for separate overvoltage and undervoltage outputs
- Supports global power specifications with switchable settings
- LED indicators for clear output status monitoring
| Specifications | Details | |
|---|---|---|
| Rated input
voltage |
K8AK-PM1 | Three-phase, three-wire Mode: 200, 220, 230 and 240 VAC
Three-phase, four-wire Mode: 115, 127, 133 and 138 VAC |
| K8AK-PM2 | Three-phase, three-wire Mode: 380, 400, 415 and 480 VAC
Three-phase, four-wire Mode: 220, 230, 240 and 277 VAC |
|
| Input load | K8AK-PM1: Approx. 4.4 VA
K8AK-PM2: Approx. 4.4 VA |
|
| Operating value setting range
(OVER, UNDER) |
Overvoltage
-30% to 25% of rated input voltage Undervoltage -30% to 25% of rated input voltage Note: The rated input voltage can be switched using the DIP switch. |
|
| Operating value | 100% operation at set value | |
| Reset value | 5% of operating value (fixed) | |
| Reset method | Automatic reset | |
| Operating time
setting range (T) |
Overvoltage/
undervoltage |
0.1 to 30 s |
| Phase sequence | 0.1 s±0.05 s | |
| Phase loss | 0.1 s max. | |
| Power ON lock time (LOCK) | 1 s or 5 s (Switched using DIP switch.) | |
| Indicators | Power (PWR): Green, Relay output (RY): Yellow, OVER/UNDER: Red | |
| Output relays | Two SPDT relays (NC operation) | |
| Output relay ratings | Rated load
Resistive load 5 A at 250 VAC 5 A at 30 VDC Maximum switching capacity: 1,250 VA, 150 W Minimum load: 5 VDC, 10 mA (reference values) Mechanical life: 10 million operations min. Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations 3 A at 250 VAC/30 VDC: 100,000 operations |
|
| Ambient operating temperature | -20 to 60°C (with no condensation or icing) | |
| Storage temperature | -25 to 65°C (with no condensation or icing) | |
| Ambient operating humidity | 25% to 85% (with no condensation) | |
| Storage humidity | 25% to 85% (with no condensation) | |
| Altitude | 2,000 m max. | |
| Terminal screw tightening torque | 0.49 to 0.59 N·m | |
| Terminal wiring method | Recommended wire
Solid wire: 2.5 mm2 Twisted wires: AWG16, AWG18 Note: 1. Ferrules with insulating sleeves must be used with twisted wires. 2. Two wires can be twisted together. Recommended ferrules Al 1,5-8BK (for AWG16) manufactured by Phoenix Contacts Al 1-8RD (for AWG18) manufactured by Phoenix Contact Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact |
|
| Case color | N1.5 | |
| Case material | PC and ABS, UL 94 V-0 | |
| Weight | Approx. 150 g | |
| Mounting | Mounts to DIN Track. | |
| Dimensions | 22.5 × 90 × 100 mm (W×H×D) | |
| Specifications | Details | |
|---|---|---|
| Input frequency | 50/60 Hz | |
| 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 and 50/60 Hz sine wave input) |
| Operating time | ±50 ms (at 25°C and 65% humidity, rated power supply voltage) | |
| 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: C22.2 No.14, CCC: GB/T 14048.5 |
|
| Insulation resistance | 20 MΩ
Between all external terminals and the case Between all input terminals and all output terminals |
|
| Dielectric strength | 2,000 VAC for 1 min
Between all external terminals and the case Between all input terminals and all output terminals |
|
| Noise immunity | 1,500 V power supply terminal common/normal mode
Square-wave noise of ±1 μs/100 ns pulse width with 1-ns rise time |
|
| Vibration resistance | Frequency: 10 to 55 Hz, 0.35-mm single amplitude
10 sweeps of 5 min each in X,Y, and Z directions |
|
| Shock resistance | 100 m/s2, 3 times each in 6 directions along 3 axes | |
| Degree of protection | Terminals: IP20 | |
| Specifications | Details | |
|---|---|---|
| Rated input* | Model | |
| 3-phase 3-wire mode | 200, 220, 230, 240 VAC | K8AK-PM1 |
| 3-phase 4-wire mode | 115, 127, 133, 138 VAC | |
| 3-phase 3-wire mode | 380, 400, 415, 480 VAC | K8AK-PM2 |
| 3-phase 4-wire mode | 220, 230, 240, 277 VAC | |
|
Catalog Name
|
Catalog Number[size]
|
Last Update
|
|---|---|---|
| K8AK-PM Catalog | N185-E1-03 [2633KB] |
Jan 04, 2024 |
| Measuring and Monitoring Relays Application Guide | N222-E1-02 [3240KB] |
Oct 15, 2024 |
Applications
- Industrial machinery protection
- Motor control and pump systems
- HVAC system supply monitoring
- Process automation power safety
- Renewable energy system voltage and current protection
Why Choose
- Protects equipment from costly damage due to abnormal voltage or current
- Compact DIN-rail design saves valuable panel space
- Quick setup with front-panel dial adjustments
- Multiple monitoring parameters in one device reduces component count
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