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Single phase small electrical fire-resistant current limiting protector.jpg

electrical fire-resistant current limiting protector.png

Single Phase Current Limiting Protector - Fire-Resistant, Adjustable Overload, China Suppliers, Factory Direct

This compact single-phase current-limiting protector is designed for high efficiency in electrical safety, rapidly interrupting short-circuit faults within microseconds to prevent potential electrical fires. With adjustable overload, temperature, and voltage protection features, it also monitors cable temperature and leakage, ensuring enhanced safety. Our product supports RS485 wired communication and offers optional wireless connectivity through LoRa, NB, or 4G, facilitating seamless remote system integration. Manufactured in China by leading suppliers, this protector is suitable for DIN-rail mounting, housed in a compact 100x72x70mm design. It operates reliably in a temperature range of -20°C to 85°C. Ideal for low-voltage residential and commercial circuits, this factory-tested device enhances safety by enabling fast fault response and real-time monitoring, effectively mitigating arc faults and other electrical hazards

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	μs	<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 dimensions

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:

1. 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.

2. 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

What rated current options are available for this electrical fire-resistant current limiting protector?

This protector is available in three rated current options: 20A, 32A, and 40A, suitable for different circuit load requirements.

How fast is the short-circuit protection response time?

The device responds to short-circuit conditions in less than 150 microseconds (μs), providing ultra-fast current-limiting protection to prevent fire hazards.

What communication methods does this protector support?

It supports wired RS485 communication as standard. Optional wireless communication modes include LORA, NB-IoT, and 4G, enabling flexible remote monitoring integration.

How should this protector be installed?

The protector is designed for standard 35mm DIN Rail mounting. Install it in a non-corrosive, well-ventilated area or heat-dissipating enclosure, and always follow the provided wiring diagrams with terminals properly tightened.

Can the overload protection and temperature monitoring thresholds be adjusted?

Yes. Overload protection action range is configurable from 0–100%In with a delay of 0–60 seconds. Temperature monitoring action range is configurable from 0–85°C with a delay of 0–60 seconds.

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

No. Because this device uses non-mechanical contacts, the output terminals still carry voltage when the protector is in current-limiting mode. Always power off the circuit before any inspection or maintenance work.