5A Overcurrent Protection Relay Board | Digital Display 5V/12V
5A Overcurrent Protection Relay Board | Digital Display 5V/12V
5A Overcurrent Protection Relay Board with Digital Tube Display
Monitor and protect your AC-powered equipment with this compact, easy-to-configure 5A Overcurrent Protection Relay Board. Designed for makers, electricians, and DIY electronics enthusiasts, this module accurately measures AC current in real time and automatically triggers relay cutoff when a user-defined threshold is exceeded — keeping your devices and circuits safe from overload conditions.
With its bright nixie/digital tube display, key-based threshold setting, and power-down memory, this relay board is ideal for dormitory power management, workshop equipment protection, and custom automation projects.
Key Features
- Dual Power Supply Options: Operates on DC 5V or DC 7–12V — flexible for a wide range of setups
- Real-Time AC Current Measurement: Measures AC 0.01–6A with ±0.05A precision, displayed to two decimal places
- Adjustable Overcurrent Threshold: Set your trip point anywhere from 0.01A to 5A via onboard keys
- Relay Output: Supports AC 220V / 10A switching; includes 1 set of normally open + normally closed contacts
- 50Hz/60Hz Compatible: Works with standard AC mains frequencies worldwide
- Digital Tube Display: Clear, real-time current readout for instant monitoring
- Power-Down Memory: Saves your threshold settings even when power is removed
- Versatile Applications: Equipment protection, current monitoring, dormitory circuit management, and more
Specifications
| Power Supply | DC 5V or DC 7–12V |
| Relay Switching Rating | AC 220V, 10A max |
| AC Frequency Support | 50Hz / 60Hz |
| Measurement Range | AC 0.01A – 6A |
| Measurement Precision | ±0.05A (2 decimal places) |
| Overcurrent Trip Range | 0.01A – 5A (user-adjustable) |
| Output Contacts | 1× Normally Open + 1× Normally Closed |
| Display Type | Nixie / Digital Tube |
| Settings Memory | Power-down save (non-volatile) |
| Country of Origin | Made in China |
Package Includes
- 1× 5A Overcurrent Protection Relay Board
Note: Slight color variations may occur due to lighting and screen differences. Please allow 1–10mm measurement tolerance due to manual measurement.
For guidance on electrical safety standards and circuit protection best practices, visit the OSHA Electrical Safety Resource. Additional technical guidance for electronic component safety can be found at the U.S. Consumer Product Safety Commission (CPSC).
Frequently Asked Questions
Q: What power supply does the overcurrent protection relay board require?
A: The relay board supports two power supply options: DC 5V or DC 7–12V. Choose the option that matches your project or installation setup. The relay output itself can switch loads up to AC 220V / 10A.
Q: How do I set the overcurrent trip threshold on this relay board?
A: The threshold is set using the onboard keys. You can configure the overcurrent trip point anywhere between 0.01A and 5A. The digital tube display shows the current setting in real time, and the power-down save feature ensures your configuration is retained even after a power cycle.
Q: What types of applications is this relay board best suited for?
A: This 5A overcurrent protection relay board is well-suited for AC current monitoring, DIY electronics projects, dormitory circuit management, workshop equipment protection, and any application where automatic cutoff based on adjustable current thresholds is needed. It is compatible with 50Hz and 60Hz AC systems.
Q: Does the relay board retain settings when power is disconnected?
A: Yes. The board features non-volatile power-down memory, meaning all your configured settings — including the overcurrent threshold — are saved automatically and restored the next time power is applied.