China Suppliers Factory: Single Phase Current-Limiting Protector for Electrical Fire Safety and Fast Fault Response

Introducing our state-of-the-art compact single-phase current-limiting protector, expertly designed to swiftly interrupt short-circuit faults within microseconds, effectively preventing electrical fires. This innovative device, manufactured in China, combines adjustable overload, temperature, and voltage protection, along with comprehensive monitoring of cable temperature and leakage, Our protector supports RS485 wired communication and offers optional wireless connectivity through LoRa, NB, or 4G, making it easy to integrate into remote systems. Built for reliability, it is designed to mount conveniently on DIN rails within a compact housing of 100x72x70mm, and it operates efficiently across a temperature range of -20°C to 85°C, Perfect for both low-voltage residential and commercial circuits, this product enhances safety by providing rapid fault response and real-time monitoring, significantly mitigating arc faults and other electrical hazards. As a leading factory in the industry, we are proud to supply top-quality current-limiting protectors that prioritize safety and efficiency

Product Details

Technical Parameters

Technical Specifications	Unit	Parameters
Rated Current	A	20\32\40
Supply Voltage	VAC	220
Display Mode	-	Chinese LCD Screen
Short-Circuit Protection	us	<150
Overload Protection	%In/s	Action range: 0-100%In (configurable); Delay: 0-60
Temperature Monitoring	℃/s	Action range: 0-85 (configurable); Delay: 0-60
Communication Mode	-	Wired RS485; Wireless LORA, NB, 4G (optional)
Ambient Temperature	℃	-20 to 85
Ambient Humidity	%RH	<95
Product Size	mm	100(L)72(W)70(H)
Installation Method	-	Standard 35mm DIN Rail Mounting

Product Display

Single phase electrical fire-resistant current limiting protector

small electrical fire-resistant current limiting protector

Outline and Installation Dimension

small electrical current limiting protector-2

Basic Functions

This device provides short-circuit protection (100μs fast current-limiting + alarm), overload protection (3–60s adjustable delay + alarm), and over-temperature protection (current-limiting + alarm). It also monitors over/under-voltage, line temperature, and leakage (alarm + optional current-limiting). RS485/wireless (optional) enables remote monitoring via platforms.

Important Information

Important Notes:

The protector uses non-mechanical contacts: when in current-limiting mode, its output still carries voltage — never touch terminals while live; always power off before inspection/maintenance.
Overheating (from high ambient temperature or poor ventilation) will trigger protection: let it cool down before reuse; ensure good ventilation.

Other Notes:

Leakage transformers and wire temperature sensors are optional.
Match the protector’s rated current to the upstream breaker (e.g., 32A breaker → set protector to 32A); never use mismatched ratings.
Install in non-corrosive, well-ventilated areas (or heat-dissipating enclosures); avoid humidity and dust.
Follow wiring diagrams; tighten terminals to prevent poor contact or overheating.

Frequently Asked Questions

Q: How fast does the protector react to a short circuit?

The device features an ultra-fast current-limiting response time of less than 150 microseconds (us) to effectively suppress short-circuit currents and prevent electrical fires.

Q: Is it safe to touch the terminals when the protector is in current-limiting mode?

No, it is not safe. The protector utilizes non-mechanical contacts, which means the output terminals still carry voltage even when in current-limiting mode. Always disconnect the upstream power source before performing maintenance.

Q: How do I properly match the protector's rated current?

You must match the protector’s rated current settings directly to the upstream circuit breaker. For example, if you are using a 32A breaker, you must set the protector to 32A. Mismatched ratings must never be used.

Q: What communication methods are available for remote monitoring?

The protector comes standard with wired RS485 communication. Additionally, wireless communication modules such as LORA, NB-IoT, and 4G can be optionally integrated for remote platform monitoring.

Q: What should I do if the over-temperature protection is triggered?

If protection is triggered due to high ambient temperatures or restricted airflow, allow the device to cool down completely before attempting to reuse it. Ensure the installation environment is well-ventilated.