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The Fireproof Microsecond Circuit Current Limiter is a core electrical safety component engineered to stop circuit fires caused by overloads, short circuits, and abnormal current surges. It performs real time current monitoring and responds within microseconds to clamp current to safe levels or cut power immediately, eliminating fire hazards at the source. With a compact structure, fast response, and high compatibility, it is widely deployed in residential, commercial, and industrial power systems—especially EV charging infrastructure, distribution boxes, and smart grids—making it a critical safeguard for enterprise electrical safety.
Unlike traditional breakers (millisecond level), this limiter acts in microseconds to suppress arc energy, drastically cutting fire risks from short circuits.
It detects and limits abnormal current instantly, rather than just extinguishing fires afterward, protecting personnel, assets, and charging equipment.
Built with industrial grade components, it maintains consistent performance under frequent switching, with long operational life and low total cost of ownership.
Compact form factor fits standard distribution boards; compatible with EV chargers, power grids, and commercial equipment, supporting unified safety deployment.
Precision sensing algorithms distinguish normal inrush from faults, ensuring stable power for enterprises without unplanned outages.
Item | Specification |
Rated current | 20A/32A/40A |
Supply voltage | 220VAC |
Display mode | LCD Screen |
Short-circuit protection | <150us |
Overload protection | Operating range: 0~100% In (rated current) adjustable; Time delay: 0~60s |
Temperature Monitoring | Operating range: 0~85°C adjustable; Time delay: 0~60s |
Communication Mode | Wired RS485; Wireless LORA, NB, 4G (optional) |
Ambient Temperature | -20~85°C |
Ambient Humidity | <95%RH (Relative Humidity) |
Product Dimensions | 100mm (L) 72mm (W) 70mm (H) |
Mounting Method | Standard 35mm DIN Rail Mounting |
- Public & Commercial EV Charging Stations: Protect AC/DC chargers from short circuits and overloads. - Enterprise Parking & Fleet Charging: Safeguard bus, logistics, and company car chargers. - Industrial Power Distribution: Limit fault current in production lines and control panels. - Commercial Buildings & Malls: Enhance fire safety in lighting, HVAC, and socket circuits. - Smart Grids & Renovation Projects: Upgrade old systems with modern current limiting protection.
Power off the upstream circuit; prepare standard tools and insulation gear.
Install in the distribution cabinet, upstream of protected loads and downstream of main breakers.
1. Connect mains supply to LINE terminals; connect load to LOAD terminals—strictly no reversal. 2. Use appropriately sized copper conductors per rated current; tighten terminals securely. 3. Ensure good ventilation; keep away from heat sources and corrosive vapors. 4. Power on and test: simulate overload/short circuit to verify fast limiting and tripping.
Follow local wiring codes; do not exceed rated voltage or current.
It limits current within 150 microseconds, effectively suppressing hazardous arcs.
It works optimally as an enhanced front end protector; pairing with a breaker provides layered safety.
Standard models support AC systems; contact us for dedicated DC charging versions.
No; design for maintenance free operation under normal conditions.
Yes, it supports both single phase and three phase grids for broad enterprise use.
