Single phase current limiting protector 20-80A 220VAC

The Single phase current limiting protector is an advanced safety device that accurately monitors circuit current and interrupts short-circuit faults within microseconds to prevent arc faults. It integrates comprehensive protection functions including overload, overvoltage, undervoltage, line temperature monitoring, and leakage detection, with optional fault arc sensing. Featuring a clear Chinese LCD display, it supports wired RS485 and wireless LoRa, NB, or 4G communication for remote alerts. Designed for DIN-rail installation, it operates reliably in environments from -20°C to 85°C, providing intelligent analysis and real-time warnings to enhance electrical fire prevention in residential and commercial applications.

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	us	<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	13083120
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.