Description
SCU01 (K8DS-PH1) Phase Sequence & Phase Loss Relay
The SCU01 (K8DS-PH1) from Omron is a three-phase phase-sequence and phase-loss monitoring relay designed to protect electrical systems and motors. It detects incorrect phase sequence and phase loss using a voltage detection method and provides a reliable SPDT relay output. This compact relay helps prevent reverse motor operation and supports stable monitoring in industrial power systems.
As an authorised distributor of Omron, E Control Devices supplies genuine SCU01 (K8DS-PH1) relays for industrial automation and electrical protection applications.
The SCU01 (K8DS-PH1) is a compact phase-monitoring relay designed for three-phase, 3-wire systems with voltages ranging from 200 to 480 VAC. The device detects both phase-sequence errors and phase-loss conditions to help maintain safe and reliable system operation.
This relay uses a voltage detection method to monitor the power supply and provides a SPDT relay output for control systems. It features LED indicators for monitoring the power and relay status, and its slim 17.5-mm design allows easy installation on DIN rails in control panels.
Key Features
- Phase Sequence Monitoring – Detects incorrect phase order in three-phase systems.
- Phase Loss Detection – Identifies phase loss when power is turned ON.
- Motor Operation Protection – Supports phase loss detection while the motor is operating.
- Voltage Detection Method – Ensures reliable monitoring of phase conditions.
- SPDT Relay Output – Provides one SPDT relay output for system control.
- LED Status Indicators – Includes Power (PWR) and Relay (RY) LED indicators for easy monitoring.
- Slim Compact Design – 17.5 mm wide housing suitable for space-saving panel installation.
- DIN Rail Mounting – Easy installation on standard DIN tracks.
- Greater Resistance to Inverter Noise – Designed to perform reliably in environments with electrical noise.
- Automatic Reset Function – Automatically resets once the fault condition is cleared.
Applications
The SCU01 (K8DS-PH1) phase monitoring relay is used in electrical and industrial systems where reliable phase monitoring is required.
Common applications include:
- Motor protection systems
- Industrial automation control panels
- Three-phase power supply monitoring
- Motor control circuits
- Equipment requiring phase sequence verification
- Protection against reverse motor operation
- Monitoring of phase loss in operating motors
This relay helps maintain correct phase order and detect phase failures, which are critical for maintaining proper operation of three-phase motors and electrical equipment.
Technical Specifications
General Specifications
| Parameter | Specification |
| Model | K8DS-PH1 |
| Product Code | SCU01 |
| Relay Type | SPDT Relay |
| Monitoring Function | Phase Sequence and Phase Loss |
| Rated Input Voltage | 3-phase, 200 to 480 VAC (3-wire) |
| Input Frequency | 50 / 60 Hz |
| Input Load | Approx. 2.7 VA |
| Mounting | DIN Track |
| Dimensions | 17.5 × 80 × 74 mm (W × D × H) |
| Weight | Approx. 60 g |
Operating Characteristics
| Parameter | Value |
| Phase Sequence Operating Time | 0.1 s ± 0.05 s |
| Phase Loss Operating Time | 0.1 s max. |
| Reset Method | Automatic reset |
| Indicators | Power (Green), Relay Output (Yellow) |
Output Relay Specifications
| Parameter | Value |
| Relay Type | One SPDT relay (NC operation) |
| Rated Load | 5 A at 250 VAC |
| Rated Load (DC) | 5 A at 30 VDC |
| Maximum Switching Capacity | 1,250 VA / 150 W |
| Minimum Load | 5 VDC, 10 mA (reference value) |
Relay Life
| Parameter | Value |
| Mechanical Life | Minimum 10 million operations |
| Electrical Life | 50,000 operations (5 A at 250 VAC / 30 VDC) |
| Electrical Life | 100,000 operations (3 A at 250 VAC / 30 VDC) |
Environmental Specifications
| Parameter | Specification |
| Operating Temperature | −20°C to 60°C |
| Storage Temperature | −25°C to 65°C |
| Operating Humidity | 25% to 85% (no condensation) |
| Storage Humidity | 25% to 85% (no condensation) |
| Maximum Altitude | 2,000 m |
Electrical and Safety Specifications
| Parameter | Specification |
| Insulation Resistance | 20 MΩ min. |
| Dielectric Strength | 2,000 VAC for 1 minute |
| Noise Immunity | Square-wave noise ±1 μs / 100 ns pulse width |
| Degree of Protection | IP20 (terminals) |
| Conforming Standards | EN 60947-5-1 |
| Safety Standards | UL 508, CSA C22.2 No.14, CCC |
Benefits of Using SCU01 (K8DS-PH1)
- Reliable Phase Monitoring: The relay continuously monitors phase sequence and phase loss conditions. This ensures that electrical systems operate only under correct power conditions.
- Protection for Three-Phase Motors: Incorrect phase sequence can cause motors to rotate in the wrong direction. This relay helps prevent reverse motor operation, protecting equipment and reducing downtime.
- Improved System Safety: Detecting phase loss quickly helps avoid damage to connected equipment. The relay activates within a short operating time when abnormal conditions occur.
- Easy Installation: The 17.5 mm slim design allows installation in compact control panels. DIN rail mounting makes installation quick and convenient for industrial environments.
- Clear Status Monitoring: The built-in LED indicators allow users to easily check power supply and relay output status, making troubleshooting and monitoring simple.
- Stable Operation in Industrial Environments: The relay offers greater resistance to inverter noise, which improves reliability in automation systems and electrical control panels.
Why Choose SCU01 (K8DS-PH1) from E Control Devices
E Control Devices supplies genuine Omron industrial automation components. As an authorised distributor of Omron, the company provides reliable products along with professional support for industrial automation and electrical protection applications.
The SCU01 (K8DS-PH1) relay is designed to deliver accurate phase monitoring, protect motors from incorrect phase conditions, and maintain the stability of three-phase power systems.
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