**AC Power Failure Sensor (220–380VAC)
DIN-Rail Monitoring · Phase Loss Detection · Dry-Contact Relay Output**
The AC Power Failure Sensor (Model BSG100) is a compact and reliable monitoring device designed to detect 220–380VAC power interruption, phase loss, or voltage drop. It outputs a dry-contact relay signal, enabling seamless integration with industrial control systems, alarm hosts, PLCs, GSM dialers, IoT gateways, and remote monitoring systems.
Designed with a DIN35mm rail mounting structure, the device features a compact form factor for easy installation in distribution boxes, control cabinets, laboratories, equipment rooms, cold storage, aquaculture sites, and other environments requiring stable AC power monitoring.
Key Features
1. Real-Time Monitoring for 220V / 380V AC
• Supports 220VAC single-phase
• Supports 380VAC three-phase (A/B/C)
• Automatically detects power loss, phase loss, or abnormal AC input
When the monitored power supply fails, the internal relay switches state and outputs a clear, stable signal.
2. High Electrical Safety & Reliability
• High insulation performance
• Withstand voltage > 500V
• Safe for long-term continuous operation
• Industrial-grade internal components
The device uses a flame-retardant enclosure and stable internal circuits to ensure 24/7 reliability.
3. Dry-Contact Relay Output (NO/NC)
Supports both normally-open (NO) and normally-closed (NC) logic.
Relay Rating: 220VAC / 30VDC, 3A
Compatible with:
• PLC
• GSM Dialer
• IoT Gateway
• Alarm System
• Automation Controller
The relay only changes state when a true failure or phase loss occurs.
4. High-Visibility LED Indicator
Power indicator stays ON during normal operation, making it easy to confirm the presence or absence of AC input at a glance.
5. DIN-Rail (35mm) Quick Installation
Sensor size: L86 × W36 × H58 mm
Standard 35mm rail mounting structure—ideal for industrial cabinets, distribution boxes, pump rooms, and network environments.
Technical Specifications (From Manufacturer Datasheet)
-
Monitoring Input:
• 220VAC single-phase
• 380VAC three-phase (A/B/C phases)
• Detects disconnection, phase loss, or voltage interruption -
Relay Output:
• Dry-contact output
• NO / COM / NC -
Electrical Ratings:
• Relay power: 220VAC / 30VDC, 3A
• Withstand voltage > 500V -
LED Status Indicator:
• Always ON when power is present
• OFF when power is lost -
Structure:
• DIN35mm rail mount
• No external power supply required
• High-safety design (no exposed conductive parts) -
Working Conditions:
• Temperature: -30°C ~ +70°C
• Humidity ≤ 90%
Wiring Guide (Integrated from the Installation Manual)
380V Three-Phase Wiring (1–4 Terminals)
• Terminals 1–3 → Live wires L1 / L2 / L3
• Terminal 4 → Neutral N
Voltage must not exceed 380VAC.
220V Single-Phase Wiring
• Terminals 1–3 bridged to Live L
• Terminal 4 → Neutral N
Voltage must not exceed 220VAC.
Relay Output (Terminals 5–7)
• NC → Normally Closed
• COM → Common
• NO → Normally Open
Note:
Always follow local electrical safety regulations.
Avoid touching high-voltage wiring during installation.
User Pain Points Solved
✔ Want to prevent equipment damage caused by 3-phase phase loss?
Real-time phase loss detection protects motors and industrial equipment.
✔ Need instant remote notification during power failure?
Relay output integrates with alarms, PLC, GSM dialers, IoT systems.
✔ Engineering environments require fast installation?
DIN-rail mount + clear terminals = fast, clean setup.
✔ Cold storage / aquaculture / equipment rooms need high reliability?
High insulation, stable relay, industrial-grade build.
Applications
• Distribution boxes
• Industrial motor systems
• Pump rooms
• Server rooms
• Cold storage/freezer monitoring
• IoT remote monitoring
• Security system linkage
• Laboratory equipment protection
Package Includes
1 × AC Power Failure Sensor
