China Suppliers Factory Miniature Single-Phase Current-Limiting Protector with LCD Screen 220VAC for Enhanced Safety

This compact single-phase current-limiting protector, designed by leading China suppliers, provides advanced circuit safety features essential for modern electrical systems. It swiftly detects and limits short-circuit currents within microseconds, effectively preventing arc faults and electrical fires. This reliable device offers comprehensive protection against overloads, over-voltage, and under-voltage conditions. Equipped with real-time monitoring capabilities for cable temperature and leakage current, it triggers alarms or disconnects when safety thresholds are exceeded. With integrated RS485 or wireless communication options, it facilitates remote monitoring and management through a centralized platform. Trust in our factory to deliver high-quality solutions that ensure maximum reliability for your electrical infrastructure

Product Details

Technical Parameters

Specifications	Unit	Parameters
Rated Current	A	20 / 32 / 40 / 50 / 63 / 80
Supply Voltage	VAC	220 (175~250V)
Display	—	LCD Screen
Short Circuit Protection	ms	<150
Overload Protection	—	Range: 0~100%In adjustable; Delay: 0~60s
Overvoltage Protection	—	Range: 221~300V adjustable; Delay: 0~60s
Undervoltage Protection	—	Range: 100~187V adjustable; Delay: 0~60s
Temperature Monitoring	—	Range: 0~85℃ adjustable; Delay: 0~60s (Optional)
Communication	—	Wired RS485, Wireless LORA, NB, 4G (Optional)
Operating Temperature	℃	-20~85
Humidity	RH	<95%
Dimensions	mm	105(L) × 56(W) × 67(H)
Mounting	—	Standard 35mm DIN rail

Product Display

Outline and Installation Dimension

LCD Display Setting Parameters

Channel	Alarm Threshold Range	Default Alarm Value	Default Protection Setting	Delay Range	Default Delay
Overvoltage	221–300V	242V	ON	0–60s	3s
Undervoltage	100–219V	187V	ON	0–60s	3s
Current	0–100%In	100%In	ON	0–60s	3s
Internal Temperature	0–85°C	80°C	ON	0–60s	3s
Line Temperature	0–85°C	80°C	ON	0–60s	3s
Leakage Current	30–1000mA	30mA	ON	0–60s	3s

Other Considerations

● The leakage current transformer is an optional accessory.
● The line temperature sensor is an optional accessory.
● When selecting a current-limiting protector, the rated current set for the protector must match that of the circuit breaker immediately upstream. For example, if the upstream circuit breaker has a rated current of 32A, the current-limiting protector must also be set to 32A. To ensure proper operation, never use a current-limiting protector in a circuit where its rated current does not match that of the upstream circuit breaker.
● The current-limiting protector features a DIN-rail mounting design. It can be installed on a switchgear panel or inside an enclosure with excellent heat dissipation. Ensure the installation location is free of water droplets, corrosive gases, and dust, and pay attention to ambient temperature and ventilation.
● Follow the wiring diagram strictly during installation. To prevent excessive contact resistance from causing local overheating and to avoid malfunctions due to poor connections, ensure all terminal screws on the protector are securely tightened.

Frequently Asked Questions

Q What rated current options are available for this current-limiting protector?

A The current-limiting protector is available in six rated current options: 20A, 32A, 40A, 50A, 63A, and 80A, covering a wide range of residential and commercial circuit requirements.

Q How is the current-limiting protector installed?

A The protector uses a standard 35mm DIN rail mounting design, making it easy to install on a switchgear panel or inside an enclosure. Ensure the installation area has good ventilation and is free from moisture, corrosive gases, and dust.

Q What communication interfaces does this protector support?

A The protector supports wired RS485 communication as standard. Optional wireless communication modules are also available, including LORA, NB (Narrowband IoT), and 4G, enabling flexible remote monitoring and smart grid integration.

Q What protection functions does the LCD display allow users to configure?

A Via the LCD display, users can configure and adjust protection parameters for overvoltage (221–300V), undervoltage (100–219V), overcurrent (0–100%In), internal temperature (0–85°C), line temperature (0–85°C), and leakage current (30–1000mA). Each channel supports an independent delay setting from 0 to 60 seconds.

Q Does the rated current of the protector need to match the upstream circuit breaker?

A Yes. The rated current of the current-limiting protector must always match the rated current of the immediately upstream circuit breaker. For example, if the upstream breaker is rated at 32A, the protector must also be configured to 32A. Mismatched ratings can cause improper operation or safety hazards.

Q Are the leakage current transformer and line temperature sensor included as standard?

A No. Both the leakage current transformer and the line temperature sensor are optional accessories. They can be added based on specific application requirements to extend the protection and monitoring capabilities of the device.