Adjustable Delay Time Over Under Voltage Protection Relay for Generator and Power Supply

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Intelligent 1P+N Auto-Reclosing Voltage Protector: Precision Protection for Modern Single-Phase Circuits

In the intricate ecosystem of modern electrical infrastructure, the stability of single-phase power—the lifeblood of residential, commercial, and light industrial applications—is foundational. Sensitive electronics, critical appliances, and essential systems are perpetually vulnerable to the silent threats of voltage instability: sustained overvoltage that stresses components and undervoltage that starves motors and disrupts logic. While interruption is a necessary response to such faults, the subsequent downtime awaiting a manual reset is an anachronism in an era of automation. The Intelligent 1P+N Auto-Reclosing Voltage Protector is engineered to bridge this gap, offering not just vigilant protection but also intelligent, autonomous recovery. This advanced device, configured in a 1P+N topology, provides comprehensive line and neutral protection in a single, efficient unit. It is designed to be the self-sufficient guardian of electrical circuits, ensuring resilience, continuity, and peace of mind by seamlessly reintegrating loads after a temporary grid anomaly has passed.

The Core of Autonomy: Engineered Delay for Stable Recovery

The protector’s intelligence is manifested in its meticulously engineered timing sequence, which ensures safe and stable operation.

· Initialization Stability (Power-On Delay): Upon initial application of power, the device incorporates a 10-second power-on delay time. This critical feature prevents immediate connection of downstream loads to a potentially unstable or transitory supply, allowing the mains voltage to settle. It protects equipment from the hazards associated with sudden energization during grid recovery after a prolonged outage.

· Protected Fault Response (Overload Breaking): In the event of a voltage fault (over or under the set threshold), the device acts decisively. The specified overload breaking time of 15 seconds represents the maximum duration the device will allow the fault condition to persist before disconnection, ensuring a rapid protective response.

· Intelligent Automatic Reconnection: After a trip event and once the grid voltage has normalized, the protector does not remain offline. Its built-in logic enforces an automatic reconnection delay time. This pause, crucial for system integrity, ensures the supply is stable before re-energizing the circuit, preventing damaging cycling of compressors, motors, or other loads and contributing to a smooth, autonomous restoration of service without any manual intervention.

Configurable Protection with High Accuracy and Efficiency

This device provides tailored protection, allowing it to be perfectly matched to the specific circuit it guards.

· Wide Voltage and Current Range: It operates effectively across a broad rated voltage of 110-300V AC, making it suitable for various single-phase standards. Its protection is highly adaptable, offered in multiple rated current versions: 1-20.8A, 1-40A, and 1-63A, each with a sensible default setting of 20A. This allows for precise calibration from very low-current control circuits up to substantial residential or commercial branch circuits.

· Fine-Grained Adjustment & Low Consumption: Protection parameters can be finely tuned with a high-resolution adjustment range of 0.1A. Despite its advanced capabilities, the device is highly energy-efficient, with power consumption ≤2W, minimizing its operational footprint and heat generation within an enclosure.

Robust Design for Reliable Integration

Built for durability and ease of installation, the protector is designed for the long term.

· Standardized Mechanical Installation: It is designed for quick and secure mounting on a 35mm symmetrical DIN rail, the global standard for electrical panel construction. This allows for neat, organized, and tool-free installation alongside other modular components like circuit breakers and contactors.

· Inherent Safety and Durability: The 1P+N design inherently provides protection for both the line and neutral conductors, a crucial safety enhancement over simpler 1P designs. Its construction prioritizes reliable performance over thousands of operational cycles.

Critical Applications for Enhanced Continuity

The auto-reclosing feature makes this protector ideal for applications where maintaining uptime is critical, or where manual reset is inconvenient or costly.

· Residential Essential Circuits: Protecting refrigerators, heating systems, home offices, and security systems. Automatic recovery ensures these essentials are back online after a common grid fluctuation, preserving food, comfort, and safety.

· Small Commercial & Retail Operations: Safeguarding point-of-sale systems, refrigeration units, lighting displays, and signage. Downtime directly impacts revenue, making automatic restoration invaluable.

· Telecommunications & Network Infrastructure: Protecting remote cabinets, fiber nodes, and amplifier stations where manual intervention requires a service dispatch.

· Agricultural and Light Industrial Controls: Automating ventilation fans, irrigation pumps, and small process machinery, ensuring continuity of operation in unattended settings.

Conclusion: The Autonomous Sentinel for the Modern Electrical Panel

The Intelligent 1P+N Auto-Reclosing Voltage Protector represents a significant step forward in accessible, smart circuit protection. It moves beyond the basic function of disconnection to embrace the role of an autonomous system manager. By integrating a safe power-on delay, a precise fault-response mechanism, and an intelligent auto-reclosing sequence, it provides a holistic solution that protects equipment while actively minimizing unnecessary downtime. Its configurable current ratings and efficient design make it a versatile choice for a wide array of single-phase applications. For homeowners, it offers enhanced convenience and asset protection. For facility managers and installers, it provides a reliable, "set-and-forget" component that increases system resilience. In a world demanding greater reliability from our electrical infrastructure, this device stands as a silent, smart sentinel—ensuring protection is not a permanent interruption but a temporary pause, with a guaranteed and intelligent path back to full operation.

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Competitive Advantage:

Advantages of Wenzhou DAQUAN Electric Co., Ltd

1. Innovation Leadership

With 258 patents and 27 years of industry experience, we lead in R&D of industrial control devices like relays and timers, ensuring cutting-edge product performance.

2. Global Certifications

Our products hold CE, ROHS, IEC, TUV certifications plus ISO9001, meeting strict international standards for seamless global market access.

3. Scale Supply Stability

Backed by a 7,800㎡ factory, 499-strong team, and 70M RMB annual output, we guarantee efficient production and timely delivery for bulk orders.