High-Quality 250A three phase electrical fire prevention current limiting protector Manufacturer, Factories

250A three phase electrical fire prevention current limiting protector. Real time monitoring of circuit current voltage and frequency. Ultra fast short circuit protection within 150 microseconds. Prevents arc faults and electrical fires effectively. Comprehensive protection includes overload over temperature over voltage and under voltage. RS485 communication port for remote monitoring and control. Suitable for industrial commercial power systems. Ensures electrical safety in high risk environments. Reliable wall mounted protection device. Advanced technology for fire prevention. Meets strict safety standards. Protects equipment and property.

Product Description

Key Features

In addition to core short-circuit current limiting protection, this device integrates multiple intelligent functions to form a comprehensive electrical safety monitoring system.

  • Overload Protection: Triggers current limiting when line current exceeds the rated value for a sustained period.
  • Overtemperature Protection: Monitors the unit's own temperature or cable temperature, activating protection when overheating occurs.
  • Multifunction Monitoring: Real-time detection and display of various electrical parameters including three-phase voltage, current, frequency, and residual current (leakage).
  • Smart Alarm: Features audible and visual alarms; uploads fault information to cloud platforms or backend systems via 4G, WIFI, or RS485 for remote monitoring.
  • Additional Protections: Some models include over/under voltage protection, phase loss protection, and arc fault detection.
Technical Parameters
Item Specification
Rated Current200A/250A
Supply Voltage220VAC (175~250V)
DisplayChinese LCD Screen
Short Circuit Protection<150us
Overload ProtectionRange: 0~100%; Delay: 0~60s
Overvoltage ProtectionRange: 221~300V; Delay: 0~60s
Undervoltage ProtectionRange: 100~219V; Delay: 0~60s
Wire Temperature MonitoringRange: 0~85℃; Delay: 0~60s
Leakage Current MonitoringRange: 30~1000mA; Delay: 0~60s
CommunicationRS485, Wireless LORA, NB-IoT, 4G (Optional)
Operating Temperature-20~85℃
Ambient Humidity<95%RH
Product Dimensions550(L)*288(W)*200(H) mm
InstallationBottom Screw Mounting
Product Display
Three Phase Molded Case Electrical Limiter
High Capacity Current Limiting Arc Fault Detection
Outline and Installation Dimension
Outline and Installation Dimension

550(L)*288(W)*200(H) mm

Application Scenarios

Thanks to its superior short-circuit protection, this three-phase device is widely used in high-risk commercial and industrial environments where electrical safety is critical.

  • Commercial Buildings: Malls, wholesale markets, and warehouses.
  • Public Institutions: Schools, hospitals, hotels, and entertainment venues.
  • Special Facilities: Electric vehicle charging stations, historic buildings, and dormitories.
Frequently Asked Questions
How fast is the short-circuit protection response?
The device features ultra-fast short-circuit protection with a response time of less than 150 microseconds (<150us).
What types of communication interfaces are available?
The unit supports RS485 as standard, with optional wireless communication modules including LORA, NB-IoT, and 4G for remote monitoring.
Can I monitor the leakage current with this device?
Yes, it includes real-time leakage current monitoring with a detection range of 30~1000mA and an adjustable delay of up to 60 seconds.
What is the operating temperature range for the limiter?
This device is designed to operate reliably in environments ranging from -20℃ to 85℃.
Is there a visual display on the unit for parameter tracking?
Yes, the device is equipped with a Chinese LCD screen that provides real-time display of voltage, current, frequency, and fault information.
What are the installation requirements for this model?
The device is designed for bottom screw mounting, making it suitable for secure installation in various electrical distribution cabinets.

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