380V Power Protection Relay | Over & Under Voltage Protector
380V Power Protection Relay | Over & Under Voltage Protector
This DIN rail three phase voltage monitoring relay works on AC380V 50/60Hz, integrating 5 core power fault protections: phase sequence reversal, phase loss, overvoltage, undervoltage and three-phase asymmetry. Equipped with independent LED status indicators and 1NO+1NC switching contact output, it instantly triggers alarm or power cut to safeguard three-phase motors, elevators, water pumps and air compressors. Standard 35mm DIN rail modular design for quick cabinet installation, factory direct wholesale with OEM customization service for overseas electrical distributors.
This DIN rail three phase voltage monitoring relay works on AC380V 50/60Hz, integrating 5 core power fault protections: phase sequence reversal, phase loss, overvoltage, undervoltage and three-phase asymmetry. Equipped with independent LED status indicators and 1NO+1NC switching contact output, it instantly triggers alarm or power cut to safeguard three-phase motors, elevators, water pumps and air compressors. Standard 35mm DIN rail modular design for quick cabinet installation, factory direct wholesale with OEM customization service for overseas electrical distributors.
1. Product Overview
2. Core Competitive Features
✅ 5 Comprehensive Built-In Protection Functions
All-in-one protection against 5 common three-phase power faults: phase sequence error, single-phase loss, overvoltage, undervoltage and three-phase voltage asymmetry, full coverage of industrial power safety risks.
✅ Universal AC380V 50/60Hz Compatibility
Standard rated voltage AC380V, dual frequency support for 50Hz and 60Hz power grids, applicable for most industrial power systems worldwide.
✅ Independent LED Visual Fault Diagnosis
Separate indicator lights for Normal, Over/Under Voltage, Phase Sequence Fault, Phase Failure and Phase Asymmetry status, maintenance workers can identify power faults at a glance without testing instruments.
✅ Stable 1NO + 1NC Relay Contact Output
Dual switching contacts (Normally Open + Normally Closed) offer flexible wiring solutions for PLC signal input, alarm buzzers or contactor trip circuits to realize automatic power-off protection.
✅ Standard 35mm DIN Rail Snap-On Installation
Modular slim body with buckle structure, fast mounting and disassembly on universal DIN rails, allows dense arrangement together with circuit breakers, terminal blocks and inverters to save cabinet space.
✅ Strong Anti-Interference PCB Circuit
Optimized internal circuit layout with anti-electromagnetic interference design, stable continuous operation in complex industrial environments with frequency converters and large contactors.
✅ Wide Compatibility with Industrial Loads
Perfectly match all three-phase AC powered equipment: elevators, water pumps, air compressors, CNC machine tools, HVAC central air conditioning and cold storage units.
✅ Factory Spot Stock & Customization Support
Direct factory supply without middle markup, sufficient ready stock for fast shipment, favorable discount pricing for large export orders; custom logo printing and packaging OEM are acceptable.
3. Main Product Specifications
| Item | Technical Parameter |
|---|---|
| Model | Three Phase Voltage Monitoring Relay |
| Rated Control Voltage | AC 380V |
| Applicable Frequency | 50Hz / 60Hz Dual Compatible |
| 5 Protection Functions | Phase Sequence, Phase Loss, Overvoltage, Undervoltage, Phase Asymmetry |
| Status Indication | Multi LED Indicators: Normal, >U/<U, Phs.Seq., Phs.Fail., Asm |
| Output Contact | 1 NO (Normally Open) + 1 NC (Normally Closed) Relay Contact |
| Mounting Standard | 35mm Standard DIN Rail Modular Installation |
| Housing Material | Flame Retardant Insulating Plastic |
| Core Function | Real-time three-phase voltage monitoring & abnormal power protection |
| Typical Application | Elevators, industrial pumps, air compressors, CNC machines, refrigeration equipment |
| Service Support | Factory wholesale, OEM private label customization, export standard shockproof packaging |
4. Wide Application Scenarios
- Passenger & freight elevator control cabinet power protection
- Industrial air compressors, refrigeration and cold storage units
- Agricultural irrigation and industrial large water pump motor protection
- CNC lathes, milling machines and automated production lines
- HVAC central air conditioning three-phase power monitoring
- Construction tower cranes and engineering mechanical equipment
- Solar photovoltaic auxiliary power distribution cabinets
- Food processing and packaging machine three-phase motor systems
5. Installation & Operation Guide
- Fasten the three phase monitoring relay onto standard 35mm DIN rail inside the electrical cabinet via the bottom buckle.
- Connect three-phase input power wires to L1, L2, L3 top terminals strictly following phase marking sequence.
- Wire alarm or control circuit cables to COM, NO, NC bottom terminals according to on-site protection logic.
- Switch on the three-phase power supply: the “Normal” LED will light up when voltage and phase sequence are within standard range.
- When any power abnormality occurs, the corresponding fault LED illuminates, and the relay contact switches to trigger power cut or alarm signal.
- After power supply fault troubleshooting and recovery, the relay automatically resets back to normal monitoring mode.
6. Frequently Asked Questions (FAQ)
Q1: What five protections can this three phase voltage relay provide?
Q2: Is this phase monitor relay compatible with both 50Hz and 60Hz power grids?
Q3: How to check power faults with this monitoring relay?
Q4: What equipment can this three phase protection relay protect?
Q5: Can you offer OEM customization for bulk export orders of this phase monitoring relay?
7. Factory Wholesale Advantages
- Original manufacturer production, competitive ex-factory price for large volume overseas export orders.
- Every finished relay passes 72-hour continuous aging test and voltage fluctuation inspection before delivery to guarantee long-term stable performance.
- Professional electrical technical team provides wiring guidance, model selection and on-site fault solution support for industrial engineering projects.
- Stable mass production capacity with short delivery cycle, shockproof anti-collision export carton packaging to avoid damage during sea transportation.
- Flexible OEM customization service including brand logo printing, parameter adjustment and personalized packaging to meet regional market demands.
1. Product Overview
2. Core Competitive Features
✅ 5 Comprehensive Built-In Protection Functions
All-in-one protection against 5 common three-phase power faults: phase sequence error, single-phase loss, overvoltage, undervoltage and three-phase voltage asymmetry, full coverage of industrial power safety risks.
✅ Universal AC380V 50/60Hz Compatibility
Standard rated voltage AC380V, dual frequency support for 50Hz and 60Hz power grids, applicable for most industrial power systems worldwide.
✅ Independent LED Visual Fault Diagnosis
Separate indicator lights for Normal, Over/Under Voltage, Phase Sequence Fault, Phase Failure and Phase Asymmetry status, maintenance workers can identify power faults at a glance without testing instruments.
✅ Stable 1NO + 1NC Relay Contact Output
Dual switching contacts (Normally Open + Normally Closed) offer flexible wiring solutions for PLC signal input, alarm buzzers or contactor trip circuits to realize automatic power-off protection.
✅ Standard 35mm DIN Rail Snap-On Installation
Modular slim body with buckle structure, fast mounting and disassembly on universal DIN rails, allows dense arrangement together with circuit breakers, terminal blocks and inverters to save cabinet space.
✅ Strong Anti-Interference PCB Circuit
Optimized internal circuit layout with anti-electromagnetic interference design, stable continuous operation in complex industrial environments with frequency converters and large contactors.
✅ Wide Compatibility with Industrial Loads
Perfectly match all three-phase AC powered equipment: elevators, water pumps, air compressors, CNC machine tools, HVAC central air conditioning and cold storage units.
✅ Factory Spot Stock & Customization Support
Direct factory supply without middle markup, sufficient ready stock for fast shipment, favorable discount pricing for large export orders; custom logo printing and packaging OEM are acceptable.
3. Main Product Specifications
| Item | Technical Parameter |
|---|---|
| Model | Three Phase Voltage Monitoring Relay |
| Rated Control Voltage | AC 380V |
| Applicable Frequency | 50Hz / 60Hz Dual Compatible |
| 5 Protection Functions | Phase Sequence, Phase Loss, Overvoltage, Undervoltage, Phase Asymmetry |
| Status Indication | Multi LED Indicators: Normal, >U/<U, Phs.Seq., Phs.Fail., Asm |
| Output Contact | 1 NO (Normally Open) + 1 NC (Normally Closed) Relay Contact |
| Mounting Standard | 35mm Standard DIN Rail Modular Installation |
| Housing Material | Flame Retardant Insulating Plastic |
| Core Function | Real-time three-phase voltage monitoring & abnormal power protection |
| Typical Application | Elevators, industrial pumps, air compressors, CNC machines, refrigeration equipment |
| Service Support | Factory wholesale, OEM private label customization, export standard shockproof packaging |
4. Wide Application Scenarios
- Passenger & freight elevator control cabinet power protection
- Industrial air compressors, refrigeration and cold storage units
- Agricultural irrigation and industrial large water pump motor protection
- CNC lathes, milling machines and automated production lines
- HVAC central air conditioning three-phase power monitoring
- Construction tower cranes and engineering mechanical equipment
- Solar photovoltaic auxiliary power distribution cabinets
- Food processing and packaging machine three-phase motor systems
5. Installation & Operation Guide
- Fasten the three phase monitoring relay onto standard 35mm DIN rail inside the electrical cabinet via the bottom buckle.
- Connect three-phase input power wires to L1, L2, L3 top terminals strictly following phase marking sequence.
- Wire alarm or control circuit cables to COM, NO, NC bottom terminals according to on-site protection logic.
- Switch on the three-phase power supply: the “Normal” LED will light up when voltage and phase sequence are within standard range.
- When any power abnormality occurs, the corresponding fault LED illuminates, and the relay contact switches to trigger power cut or alarm signal.
- After power supply fault troubleshooting and recovery, the relay automatically resets back to normal monitoring mode.
6. Frequently Asked Questions (FAQ)
Q1: What five protections can this three phase voltage relay provide?
Q2: Is this phase monitor relay compatible with both 50Hz and 60Hz power grids?
Q3: How to check power faults with this monitoring relay?
Q4: What equipment can this three phase protection relay protect?
Q5: Can you offer OEM customization for bulk export orders of this phase monitoring relay?
7. Factory Wholesale Advantages
- Original manufacturer production, competitive ex-factory price for large volume overseas export orders.
- Every finished relay passes 72-hour continuous aging test and voltage fluctuation inspection before delivery to guarantee long-term stable performance.
- Professional electrical technical team provides wiring guidance, model selection and on-site fault solution support for industrial engineering projects.
- Stable mass production capacity with short delivery cycle, shockproof anti-collision export carton packaging to avoid damage during sea transportation.
- Flexible OEM customization service including brand logo printing, parameter adjustment and personalized packaging to meet regional market demands.
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