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ABB 1SVR740750R0400 Voltage Monitoring Relay  

1. Key Parameters

• Product Model: 1SVR740750R0400
• Order Code: 1SVR740750R0400
• Product Series: ABB 1SVR Series Industrial Voltage Monitoring Relays (AC Voltage, Over/Undervoltage + Phase Loss Protection)
• Core Function: Monitors AC voltage (single/3-phase); detects overvoltage, undervoltage, and phase loss (3-phase models); triggers relay outputs for protection/alarm; provides visual status indication; ensures electrical system stability
• Electrical Specifications:

  Parameter	Details	Performance Metrics
  Input Voltage Range	- Single-phase: AC 230V ±10% (50Hz/60Hz auto-adaptive) - 3-phase: AC 400V ±10% (50Hz/60Hz auto-adaptive)	Compatible with global low-voltage grids
  Monitoring Functions	- Overvoltage (OV): 105%~130% of rated voltage (configurable) - Undervoltage (UV): 70%~95% of rated voltage (configurable) - Phase Loss (PL): Detects ≥1 missing phase (3-phase only) - Phase Sequence (optional): Prevents reverse phase operation	Detection accuracy: ±1% of rated voltage
  Response Time	- OV/UV: ≤200ms (at 10% deviation from set threshold) - Phase Loss: ≤500ms	Ensures fast protection against voltage anomalies
  Output Configuration	2× SPDT (Single Pole Double Throw) relay outputs; 1× NO (Normally Open) + 1× NC (Normally Closed) per channel	Rated output current: 10A AC 250V (resistive); 2A AC 250V (inductive)
  Electrical Life	100,000 operations (at rated load)	Durable for frequent voltage fluctuation scenarios
  Mechanical Life	10,000,000 operations (no-load)	Reliable in long-term industrial use

• Mechanical & Environmental Specifications:
  • Housing Material: Flame-retardant thermoplastic (UL94 V-0); impact-resistant
  • Dimensions (W×H×D): 22.5mm × 78mm × 55mm (DIN rail-mountable, compact design)
  • Mounting: DIN rail-mounted (35mm standard rail, TS 35/7.5); snap-on installation (no tools required)
  • Weight: Approximately 80g
  • LED Indicators (front panel):
    • Power (PWR): Green (relay powered on)
    • Overvoltage (OV): Red (OV detected)
    • Undervoltage (UV): Amber (UV detected)
    • Phase Loss (PL): Red (PL detected, 3-phase models only)
    • Output Status (OUT): Green (output active)
  • Protection Rating: IP20 (front panel; protects against finger contact and small debris)
  • Operating Temperature Range: -5℃~+55℃ (23℉~131℉)
  • Storage Temperature Range: -40℃~+85℃ (-40℉~185℉)
  • Humidity Tolerance: ≤95% RH (non-condensing, 40℃; suitable for damp industrial areas)
  • Vibration Resistance: 10~500Hz, 1g acceleration (IEC 60068-2-6; no false detection)
• Compliance Standards: IEC 60947-5-1 (low-voltage switchgear), EN 61000-6-2 (EMC immunity), UL 508 (industrial safety), CE, RoHS

2. Key Features

• Multi-Function Voltage Monitoring: Integrates overvoltage, undervoltage, and phase loss detection (3-phase models) in a single device—eliminates the need for multiple discrete relays, reducing control panel space and system complexity by 40%.
• High Detection Accuracy: ±1% voltage detection accuracy ensures reliable identification of minor anomalies (e.g., 5% overvoltage) that could damage sensitive equipment (e.g., PLCs, motors)—avoids false triggers from normal voltage fluctuations (≤3%).
• Fast Response Time: ≤200ms for OV/UV and ≤500ms for phase loss ensures rapid protective action, minimizing equipment exposure to harmful voltage conditions (e.g., preventing motor insulation breakdown from prolonged overvoltage).
• Industrial-Grade Durability: UL94 V-0 flame-retardant housing and IP20 protection withstands factory dust, accidental contact, and mild mechanical impact—ensures 99.9% uptime in harsh industrial environments.
• Flexible Threshold Configuration: Overvoltage (105%~130%) and undervoltage (70%~95%) thresholds are adjustable via internal potentiometers—adapts to diverse application requirements (e.g., 110% OV for motors, 105% OV for sensitive electronics).
• DIN Rail Mounting & LED Status: Compact 22.5mm width maximizes space efficiency in control panels; intuitive LED indicators provide instant visual confirmation of voltage status and faults—simplifies troubleshooting (no need for external test tools).
• Wide Voltage Compatibility: Supports single-phase 230V and 3-phase 400V grids with 50Hz/60Hz auto-adaptation—suitable for global industrial applications, reducing inventory complexity for multi-region projects.

3. Application Fields

• Motor Protection: Primary application—safeguarding industrial motors from voltage damage:
  • Industrial Pumps & Fans: Monitors 3-phase 400V supply to 10kW~50kW motors; detects undervoltage (≤80% rated) to prevent motor stall (which causes overheating) and overvoltage (≥115% rated) to avoid insulation breakdown—extends motor lifespan by 30%.
  • Compressors: Protects single-phase 230V air compressors; triggers shutdown if voltage drops below 75% (preventing overload) or exceeds 125% (avoiding capacitor failure)—reduces maintenance costs for manufacturing air supply systems.
• Low-Voltage Distribution: Ensures stability in power distribution networks:
  • Factory Distribution Panels: Integrates with ABB S800 distribution boards to monitor 3-phase 400V supply; phase loss detection prevents 2-phase operation of downstream equipment (e.g., conveyors), which can cause motor burnout.
  • Commercial Building Electrical Systems: Monitors single-phase 230V supply to lighting and HVAC auxiliary circuits; overvoltage protection (≥120% rated) prevents LED bulb burnout and HVAC controller damage during grid surges.
• Automation & Control Systems: Protects sensitive electronic equipment:
  • PLC & HMI Panels: Monitors 24V DC auxiliary power (via external transformer) or 230V AC main supply to AC500 PLCs; undervoltage detection (≤90% rated) triggers backup power activation, preventing program loss and production downtime.
  • Automated Production Lines: Safeguards 3-phase 400V supply to robotic arms and assembly machines; phase loss detection shuts down equipment within 500ms, avoiding mechanical jams and costly rework of defective products.

4. Precautions

• Input Voltage Compatibility: Use only with the specified input voltage (single-phase 230V or 3-phase 400V)—connecting to incorrect voltage (e.g., 110V AC to a 230V model) will burn the internal voltage detection circuit, requiring full relay replacement. Verify grid voltage with a multimeter before installation.
• 3-Phase Wiring Requirements (Critical): For 3-phase models, ensure all three phases (L1, L2, L3) are connected to the correct terminals—missing or reversed phases disable phase loss detection and may cause false UV/OV alarms. Refer to the wiring diagram on the relay housing for terminal assignments.
• Electrical Safety:
  • Power Disconnection: Always disconnect the input power before wiring or adjusting the relay—exposed terminals carry live voltage (up to 400V AC), posing fatal shock risks. Use lockout/tagout procedures in industrial settings.
  • Output Load Limits: Do not exceed 10A resistive/2A inductive per output channel—overloading causes relay contact welding, leading to stuck outputs (e.g., failed shutdown during overvoltage). Use external contactors for loads >10A (e.g., 15kW motors).
• Configuration & Calibration:
  • Threshold Adjustment: Use a precision voltage source to calibrate OV/UV thresholds during commissioning—incorrect settings (e.g., 130% OV for a 230V motor) render protection ineffective or cause unnecessary shutdowns. Document final settings for future reference.
  • Regular Calibration: Recalibrate annually using a calibrated multimeter—voltage detection accuracy drifts by ±0.5% per year, which may miss critical anomalies (e.g., 4% overvoltage) in sensitive applications.
• Environmental Limitations:
  • Temperature & Humidity: Avoid operating above +55℃ or in condensing humidity (>95% RH with condensation)—high temperatures reduce threshold accuracy, while condensation causes terminal corrosion, leading to intermittent detection.
  • Dust & Vibration: Install in a dust-tight control panel (IP54 or higher) in dusty environments (e.g., cement plants); use vibration-damping mounts in high-vibration equipment (e.g., near pumps)—dust accumulation blocks vents, and excessive vibration loosens internal components.
• Troubleshooting:
  • False Alarms: If false OV/UV triggers occur, check for grid voltage transients (use a power quality analyzer) or EMI from nearby VFDs—install an EMI filter (e.g., ABB 1SVR730000R0000) to suppress noise.
  • No Detection: If voltage anomalies are not detected, verify wiring (e.g., loose phase connections in 3-phase models) and calibration—replace the relay if internal fuses or voltage sensors are damaged (indicated by unlit power LED)
• 

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