Product Overview
Based on ATST Electric’s core concept of “Precise Control, Safe and Reliable”, SFMK03/SFMKA/MKS-03 Under and Over Voltage Protection Relay is developed to provide reliable voltage monitoring and protection for low-voltage electrical systems.
The device continuously detects the power supply voltage condition and identifies abnormal situations such as excessive voltage rise or insufficient voltage level. When the voltage exceeds or falls below the preset protection range, the relay can send a control signal to disconnect the load or trigger a protection action, helping prevent equipment damage caused by unstable power supply.
With compact modular structure and reliable protection performance, SFMK03/SFMKA/MKS-03 can be easily integrated into distribution boards, control cabinets and automation systems. It provides an effective protection solution for electrical equipment that requires stable voltage operation.
Main Features
1. Over-voltage protection: Monitors excessive voltage conditions and helps prevent damage caused by voltage surges or abnormal power supply.
2. Under-voltage protection: Detects insufficient voltage conditions and protects equipment from unstable operation caused by low voltage.
3. Real-time voltage monitoring: Continuously checks system voltage status to improve electrical safety and reliability.
4. Automatic protection control: Provides fast response when voltage abnormalities occur, reducing the risk of equipment failure.
5. Adjustable protection parameters: Allows engineers to configure protection settings according to different application requirements.
6. Compact modular design: Suitable for installation in electrical cabinets, distribution panels and industrial control systems.
7. Reliable relay output: Provides stable switching performance for protection and control circuits.
8. Wide application compatibility: Suitable for various low-voltage electrical systems, motors and automation equipment.
Application Scenarios
1. Motor protection systems: Used for three-phase and single-phase motors to prevent damage caused by abnormal voltage conditions.
2. Pump control systems: Suitable for water pumps, circulation pumps, drainage pumps and industrial pump equipment requiring voltage protection.
3. Compressor systems: Applied in air compressors and refrigeration equipment to ensure stable operation under proper voltage conditions.
4. Industrial automation equipment: Used in production lines, machine tools and automated equipment to protect sensitive electrical components.
5. Electrical distribution systems: Installed in distribution cabinets and control panels to improve power supply reliability.
6. HVAC systems: Suitable for fans, air conditioning units and cooling equipment requiring stable voltage operation.
7. Commercial and building facilities: Applied in elevators, lighting systems and other electrical equipment requiring protection against voltage fluctuations.
Technical Date
| Supply voltage | 220VAC+35%, 50/60Hz (L1-N) |
| Contacts type | 1 Inversor, 10A, 250VAC |
| Under voltage setting | 210V, 150V adjustable |
| Over voltage setting | 230V, 300V adjustable |
| Hysteresis | 5V(on the delay on) |
| Power consumption | <7VA |
| Ambiant temperature | -5~+55°C |
Wiring Diagram
Dimensions
