Omron K8DS-PH Series Voltage/Current Monitoring Components
The Omron K8DS-PH Series is a compact, high-performance three-phase voltage monitoring relay designed to protect motors and industrial equipment from dangerous supply conditions. It provides reliable detection of phase loss, phase sequence errors, and over/undervoltage, ensuring safe operation in demanding industrial environments.
Categories:
Panel ComponentsKey Features
- Space-saving design with 17.5 mm slim housing for compact panels
- Reliable performance even in environments with high inverter noise
- Ensures correct motor rotation by detecting phase sequence and phase loss at startup
- Supports phase loss detection during motor operation for enhanced safety
- LED status indicators enable quick troubleshooting and status checks
- Prevents costly downtime by avoiding reverse motor operation
| Specifications | Details | |
|---|---|---|
| Rated input voltage | 3-phase, 200 to 480 VAC (3-wire) | |
| Input load | Approx. 2.7 VA | |
| Operating time | Phase sequence | 0.1 s±0.05 s |
| Phase loss | 0.1 s max. (when the voltage changes rapidly from 100% to 0% of rated voltage) | |
| Reset method | Automatic reset | |
| Indicators | Power (PWR): Green, Relay output (RY): Yellow | |
| Output relays | One SPDT relay (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 Nm | |
| 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 Contact 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, UL 94 V-0 | |
| Weight | Approx. 60 g | |
| Mounting | Mounts to DIN Track. | |
| Dimensions | 17.5 × 80 × 74 mm (W × D × H) | |
| Specifications | Details | |
|---|---|---|
| Input voltage range | 200 to 480 VAC | |
| Input frequency | 50/60 Hz (no presumed range) | |
| Overload capacity | Continuous 500 V | |
| Phase loss detection level | 80%±10% of rated input
Calculation Formula = 1 - ((Highest phase-to-phase voltage - Lowest phase-to-phase voltage)/ Average three-phase phase-to-phase 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 min.
Between external terminals and case Between input terminals and output terminals |
|
| Dielectric strength | 2,000 VAC for one minute
Between external terminals and case Between input terminals and 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 | |
| Function | Rated input voltage * | Relay output | Model |
|---|---|---|---|
| Phase sequence and phase loss monitoring | 3-phase, 3-wire 200 to 480 VAC | SPDT × 1 | K8DS-PH1 |
|
Catalog Name
|
Catalog Number[size]
|
Last Update
|
|---|---|---|
| K8DS-PH Data Sheet | N190-E1-02 [1993KB] |
Jul 10, 2023 |
| Measuring and Monitoring Relays Application Guide | N222-E1-02 [3240KB] |
Oct 15, 2024 |
Applications
- Motor and pump protection
- HVAC system safety control
- Conveyor and material handling systems
- Water treatment plant equipment
- Industrial automation safety circuits
Why Choose
- Prevents costly damage to motors and equipment from incorrect wiring or power faults
- Fast response to abnormal conditions for minimal downtime
- Compact, lightweight design for modern control panels
- Simple dial-based setup — no complex programming required
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