Single Phase Current Limiting Protector 20-80A 220VAC - Reliable China Suppliers & Factory Solutions

The Single Phase Current Limiting Protector is a cutting-edge safety device designed to ensure maximum protection for electrical systems. Manufactured by leading suppliers in China, this protector effectively monitors circuit currents and interrupts short-circuit faults within microseconds, significantly reducing the risk of arc faults. It boasts an array of integrated protection features, including overload, overvoltage, undervoltage, line temperature monitoring, and leakage detection, with optional fault arc sensing capabilities, Equipped with a clear LCD display in Chinese, this device offers robust communication options, supporting both wired RS485 and wireless protocols such as LoRa, NB, or 4G for remote alerts. Built for easy DIN-rail installation, it operates reliably across a wide temperature range from -20°C to 85°C. This innovative product not only enhances electrical fire prevention in residential and commercial applications but also provides intelligent analysis and real-time warnings. Choose this exceptional product from a trusted factory in China to safeguard your electrical installations effectively

Product Details

Function & Application

📡 Real-time Monitoring: Tracks & displays circuit short-circuit current, fault arc (opt.), voltage, current, frequency, temperature, residual current, and communication status.
🔔 Alarm & Protection: Alerts (audible/visual) on faults/over-limits; microsecond-level current-limiting protection.
⚠️ Fault Prompt: Signals self-faults (e.g., arc detection failure) for maintenance.
📶 Communication: RS485/4G module; transmits data to cloud for smart electrical safety supervision.

Product Display

Single-Phase-EFP-Current-Limiter-Main-Product-Angle-View

Single-Phase-EFP-Current-Limiter-Back-View-Structure

Technical Parameters

Specification	Unit	Details
Rated Current	A	20/32/40/50/63/80
Supply Voltage	VAC	220 (175~250)
Display Mode	-	Chinese LCD screen
Short-circuit Protection	μs	<150
Overload Protection	-	0~100%In (config); Delay: 0~60s (config)
Overvoltage Protection	V	221~300 (config); Delay: 0~60s (config)
Undervoltage Protection	V	100~219 (config); Delay: 0~60s (config)
Wire Temperature Monitoring	℃	0~85 (config); Delay: 0~60s (config)
Leakage Monitoring	mA	30~1000 (config); Delay: 0~60s (config)
Communication Mode	-	Wired RS485; Wireless LORA, NB, 4G (opt.)
Ambient Temperature	℃	-20~85
Ambient Humidity	%RH	<95
Product Size	mm	130×83×120
Installation Method	-	Standard 35mm DIN rail mounting

Outline and Installation Dimension

Single phase current limiting protector-2

Wiring Instructions

Single phase current limiting protector-3

⚠️ Special Notes:

1.If a leakage protector is installed at the front end, the neutral wire must be led from the outlet terminal of the leakage protector to the current-limiting protector.
2.The product is installed in a distribution box/cabinet. It generates significant heat during operation; high-displacement fans must be installed on the door panel or both sides of the distribution box/cabinet.
3.The neutral wire connected to this protector is only used to supply power to the protector. Do not connect the neutral wire from the protector to terminal load equipment.
4.Auxiliary functions such as RS485 communication, leakage detection, and temperature sensing may not be connected in practical applications.

Other Notes

◻The residual current transformer is an optional component.
◻The cable temperature sensor is an optional component.
◻When selecting a current-limiting protector, its set rated current must match the rated current of the upstream circuit breaker. For example, if the upstream circuit breaker has a rated current of 32A, the current-limiting protector should also be set to 32A. To ensure proper operation, it is strictly prohibited to install the protector in a circuit where its rated current does not match that of the upstream breaker.
◻The current-limiting protector is designed for DIN-rail mounting and may also be installed using a hanging rope mount or inside an enclosure with good heat dissipation. Ensure the installation site is free from water leakage, corrosive gases, and deposits, and pay attention to ambient temperature and ventilation.
◻Wiring should be performed according to the connection diagram. To prevent localized overheating due to excessive contact resistance or malfunction caused by poor contact, ensure all terminals are securely and firmly tightened.

Frequently Asked Questions

QWhat is the rated current range of the single-phase EFP current-limiting protector?

The single-phase EFP current-limiting protector is available in the following rated current options: 20A, 32A, 40A, 50A, 63A, and 80A. When selecting a model, ensure that the set rated current matches the rated current of the upstream circuit breaker.

QHow fast is the short-circuit protection response time?

The protector features microsecond-level current-limiting protection with a short-circuit protection response time of less than 150 microseconds (μs), ensuring extremely fast response to prevent equipment damage and electrical hazards.

QWhat communication methods does this protector support?

The device supports wired RS485 communication as standard. Optional wireless communication modules include LORA, NB-IoT, and 4G, allowing data transmission to the cloud for smart electrical safety supervision and remote monitoring.

QHow is the current-limiting protector installed?

The protector is designed for standard 35mm DIN rail mounting. It may also be installed using a hanging rope mount or inside an enclosure with good heat dissipation. Ensure the installation environment is free from water leakage, corrosive gases, and excessive dust, with proper ventilation and attention to ambient temperature.

QAre the residual current transformer and cable temperature sensor included?

No, both the residual current transformer and the cable temperature sensor are optional components and are not included as standard. They can be added as needed depending on the application requirements. Auxiliary functions such as RS485 communication, leakage detection, and temperature sensing are also optional and may not be required in all installations.

QWhat protections does the device provide beyond short-circuit protection?

In addition to microsecond-level short-circuit protection, the device provides comprehensive protection including overload protection (0~100%In configurable), overvoltage protection (221~300V configurable), undervoltage protection (100~219V configurable), wire temperature monitoring (0~85℃ configurable), and leakage monitoring (30~1000mA configurable). All protection thresholds and delays (0~60s) are user-configurable.