The Siemens 3UG4633-1AL30 is a voltage monitoring relay built for reliable detection of overvoltage and undervoltage situations. Ideal for industrial systems operating at 220V AC, this device protects motors and electrical loads from damage due to supply voltage fluctuations. Its compact form and DIN-rail mount allow for easy installation in control cabinets. The adjustable voltage thresholds and LED indicators ensure real-time monitoring, helping maintain system stability and equipment longevity. ⚙️ Technical Specifications (EN): Part Number: 3UG4633-1AL30 Function: Overvoltage and undervoltage monitoring Rated Voltage: 220V AC System Type: Single-phase or 3-phase Voltage Monitoring Range: Adjustable Mounting Type: DIN rail Response Time: Fast detection of voltage deviations Indication: LED status indicators Output Contacts: 1 changeover contact (SPDT) Application: Voltage stability and protection in automation systems Standards Compliance: IEC/EN 60255, IEC/EN 60947-5-1