40A/63A DIN Rail Adjustable Voltage & Current Relay Protector
40A/63A DIN Rail Adjustable Voltage & Current Relay Protector
40A/63A DIN Rail Adjustable Voltage & Current Protective Relay
Keep your electrical circuits safe and your equipment running smoothly with this adjustable DIN rail protective relay. Designed for both residential and commercial applications, this device continuously monitors voltage and current levels, automatically disconnecting the circuit when values fall outside your preset thresholds — before damage can occur.
Key Features
- Dual Display: Two built-in displays simultaneously show real-time voltage and current levels for instant circuit monitoring.
- Fully Adjustable Thresholds: Set overvoltage protection (130–300V), undervoltage protection (80–210V), and overcurrent limits (1–40A or 1–63A) to match your specific application.
- Multi-Mode Display: Cycle through voltage, current, frequency, and apparent power readings at a glance.
- Manual & Automatic Recovery: Choose whether the relay auto-resets after a fault clears or requires a manual restart — giving you full control over reconnection.
- Set Lock: Parameter lock prevents accidental changes to your configured thresholds.
- Energy-Saving Mode: Dims the digital display when the protector is inactive to reduce power consumption.
- Continuous Overcurrent Counting: Tracks overcurrent events for ongoing monitoring and diagnostics.
- Embedded RTOS: Real-time operating system ensures high performance, stability, and reliability.
- Fast Fault Response: Detects and responds to power anomalies — including power failure, abnormal switching events, and grid disturbances — in 0.1–10.0 seconds.
- DC Compatible: Also works with DC circuits in the 80–300V range (note: current/power readings not valid in DC mode).
Specifications
| Power Supply | 230VAC, 50/60Hz |
| Max Load Current | 40A or 63A (adjustable, 1A increments) |
| Overvoltage Default / Range | 270V default / 130–300V adjustable |
| Undervoltage Default / Range | 170V default / 80–210V adjustable |
| Effective AC Voltage Range | 80–300V (±1% calibratable) |
| Effective AC Current Range | 0.1–40A or 0.1–63A (±1% calibratable) |
| Frequency Range | 40–70Hz (±1% calibratable) |
| DC Effective Range | 80–300VDC |
| Return Difference | Fixed 5V (overvoltage & undervoltage) |
| Timer Range | 1–999 seconds |
| Action Time | 0.1–10.0 seconds |
| Screen Refresh Rate | >1000Hz |
| Measurement Algorithm | Root Mean Square (RMS) |
| Mounting | Standard DIN Rail |
| Country of Origin | Made in Mainland China |
What's in the Box
- 1× Over/Under Voltage & Overcurrent Protective Relay Device
Important Notes
- Colors may appear slightly different due to screen and lighting variations.
- Please allow 1mm–1cm tolerance due to manual measurement.
- Always consult a qualified electrician for installation in compliance with local electrical codes.
For more guidance on safe electrical installations and circuit protection standards, visit the U.S. Consumer Product Safety Commission – Electrical Safety.
Frequently Asked Questions
Q: What is the difference between the 40A and 63A versions of this DIN rail protective relay?
A: The 40A version supports a maximum load current of 1–40A and is suited for smaller residential or light commercial circuits. The 63A version handles up to 1–63A and is better suited for higher-load commercial or industrial applications. Both versions offer the same overvoltage, undervoltage, and overcurrent protection features with identical adjustability ranges for voltage thresholds.
Q: Can I mount this protective relay on a standard DIN rail panel?
A: Yes — this device is designed specifically for standard DIN rail mounting, making it compatible with most residential and commercial electrical distribution panels and enclosures. It snaps securely onto any standard 35mm DIN rail.
Q: How do I set the overvoltage and undervoltage thresholds?
A: The thresholds are adjustable directly via the device's onboard controls. Overvoltage can be set anywhere between 130V and 300V (default: 270V), and undervoltage can be set between 80V and 210V (default: 170V). Use the set lock feature after configuring to prevent accidental changes. The fault indicator LED will illuminate if parameters are not properly configured.
Q: Does this device work with DC circuits?
A: Yes, this protective relay supports DC circuits in the 80–300VDC effective range. However, please note that in DC mode, current and power readings will be inactive — only voltage monitoring is functional for DC applications.