Features Overvoltage and undervoltage single‑phase voltage monitoring, real‑time monitoring voltage faults. The monitoring relay is powered by the measurement circuit, no additional power supply required. The monitoring relay has 1 group of normally open(NO) and normally closed(NC) contacts. The monitoring relay has 3LEDs for status indication of overvoltage, undervoltage and normal. Compact shape, guide rail installation, about 35mm/1.4in DIN rail mount. Feature: 1. Overvoltage and undervoltage single‑phase voltage monitoring, real‑time monitoring voltage faults. 2. The monitoring relay is powered by the measurement circuit, no additional power supply required. 3. The monitoring relay has 1 group of normally open(NO) and normally closed(NC) contacts. 4. The monitoring relay has 3LEDs for status indication of overvoltage, undervoltage and normal. 5. Compact shape, guide rail installation, about 35mm/1.4in DIN rail mount. Specification: Condition: 100% Brand New Item Type: Single‑Phase Voltage Monitoring Relay Material: Plastic Color: As Pictures Shown Model: SVR-220 Monitoring Circuit: L,N Rated Voltage: 220VAC, 50/60Hz Protection Function: Overvoltage, Undervoltage Overvoltage Setting Value: 253 Undervoltage Setting Value: 187 Display Mode: over Voltage, Under Voltage, Normal 3 LED Lights Indicate Working Status Contact Form: 1 Group of Normally Open Normally Closed Contacts Contact Capacity: 3A 250VAC (Resistive) Dimensions (L x W x D): Approx. 68 x 30 x 76mm/2.7 x 1.2 x 3in Installation Method: 35mm/1.4in Rail Typical Application: Motor, Fan, Water pump, compressor, Crane,  Driving, Lifts, Cranes, Elevators, Machine tools, Central Conditioning, Refrigeration Equipment, Laser Equipment, Industrial Control System Package List: 1 x Relay1 x Instruction Package List 1 x Relay 1 x Instruction