Compact DIN rail over and under voltage protector relay for home electrical circuits. Designed for 230Vac 50Hz systems, automatic reset operation, and DIN rail installation. This listing is for Size 80A with Color No Display. Related current options referenced: 40A and 63A. Key benefits Continuous voltage monitoring: automatically disconnects load when supply voltage moves outside safe limits, then restores power when voltage returns to normal. Reduces manual intervention: automatic reset means the device reconnects without the need for user action, minimizing downtime. Simple installation: DIN rail form factor fits standard distribution boards and electrical enclosures for neat integration. Suitable for higher domestic loads: specified as 80A for this unit, with other current options referenced for selection based on circuit requirements. Clear application focus: intended for home usage to protect appliances and electrical equipment from voltage fluctuations. Main features and specifications Function: over and under voltage protective relay with automatic reset Rated supply: 230Vac, 50Hz Mounting: DIN rail compatible Size option for this listing: 80A (other referenced ratings include 40A and 63A) Color: No Display Intended use: protector relay for household circuits and appliances How it solves common problems Prevents repeated tripping or damage to appliances by disconnecting power during sustained overvoltage or undervoltage events. Avoids the need to manually reset devices after transient grid disturbances by providing automatic reconnection when conditions normalize. Provides a centralized protective device that is easy to add to existing distribution boards. Practical use scenarios Protecting home refrigeration and HVAC systems from voltage dips and surges that can cause motor stress or compressor failure. Safeguarding well pumps, garage equipment, and other motor loads where sustained voltage variation can lead to premature wear. Integrating into a home electrical panel to protect circuits feeding sensitive electronics and household appliances. What to check before installation Confirm household supply is 230Vac, 50Hz. Match the device current rating to the circuit load; this unit is 80A. Other current options may be available. Ensure compatibility with your distribution board DIN rail mounting system. This device provides straightforward over and under voltage protection for residential electrical circuits, combining automatic reset operation with DIN rail convenience to reduce downtime and help protect household equipment.