China GNM1EL Residual Current Operated Circuit Breaker Suppliers, Manufacturers

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China GNM1EL Residual Current Operated Circuit Breaker Suppliers, Manufacturers

The rated insulation voltage of GNM1EL series residual current operated circuit breakers is 1000V, suitable for distribution networks with AC 50Hz, rated voltage AC415V and below, and rated current up to 630A. Under normal circumstances, circuit breakers can be used for infrequent switching of lines and infrequent starting of motors. It has protection functions for overload, short circuit, overvoltage, undervoltage, and phase loss of the circuit; It has residual current protection function, and the residual current action value and action time are adjustable in multiple levels.

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Product Description

Work Environment

(1) The ambient temperature is between -5 ℃ and +40 ℃, and the altitude does not exceed 2000 meters.

(2) Atmospheric conditions: The maximum temperature is 40 ℃, the relative humidity of the air does not exceed 50%, and higher temperatures are allowed at lower temperatures (e.g., 90% at 20 ℃).

(3) External magnetic field should not exceed 5 times the geomagnetic field. Avoid large electromagnetic interference (high-power motors or frequency converters). No explosive/corrosive gases, rain, or snow.

(4) Pollution level: Level 3; Installation category: III.

Applicable Standards:

GB/T 14048.2-2020 "Low voltage switchgear and control gear"
GB/Z 6829 General Requirements for Residual Current Operated Protectors
GB/T 22710-2008 "Electronic Controllers for Low Voltage Circuit Breakers"

Product Selection

Main Body Model Description

Series	Working Current	Disconnection Ability	Number of Poles	Protection Form	Internal Accessories	Accessory Voltage
GNM1EL	250 (125, 250, 400, 630)	M: 35/50kA H: 65/70kA	A: N pole no open/close B: N pole open/close	3: 3 poles protection	00: None, 08: Alarm, 10: Shunt, 20: Auxiliary...	AC400V, AC230V, DC24V

Selling Accessories Separately

Frame Current	Appendix	Attachment Location	Wiring
125, 250, 400, 630	Shunt (AC400/230, DC24), Auxiliary, Alarm	Left / Right	Lead wire / Terminal

Technical Parameters

Product	GNM1EL-125	GNM1EL-250	GNM1EL-400	GNM1EL-630
Rated Voltage Ue(V)	400	400	400/415	400/415
Rated Current In	125A (50~125A Adj)	250A (100~250A Adj)	400A (160~400A Adj)	630A (252~630A Adj)
Breaking Capacity Icu	M:35 / H:65	M:35 / H:65	M:50 / H:70	M:50 / H:70
Residual Current	50-1000mA Adjustable
Mechanical Life	7000 times

Note: When ambient temperature exceeds +40℃, the required current will be reduced due to heat generation.

Explanation of Symbols

IR: Overload long delay current	Isd: Short circuit short delay current
Ii: Instantaneous tripping current	In: Controller rated current
Uvo: Overvoltage protection value	Uvu: Undervoltage protection value

Protection Functions

Voltage Protection

Overvoltage: Range 253~286V, Delay 1~30s.

Undervoltage: Range 154~187V, Delay 1~30s.

Phase Loss: Threshold 100~135V, Delay 1~30s.

Current Protection

Overload Long Delay: IR = (0.4 ~ 1.0) × In; Time TR = 3 ~ 18s.

Short Circuit Instantaneous: Ii = (4 ~ 14) × IR; Action time < 200ms.

Residual Current (Leakage): 50mA to 1000mA adjustable; Breaking time up to 1000ms.

Appearance & Dimensions

Model	L (mm)	W (mm)	A (mm)	B (mm)	F (mm)
GNM1EL-125/250	165	140	35	144	116
GNM1EL-400/630	257	184	43.5	230	155

Safety Notes & Warranty

Safety Checklist: Read the manual before installation; confirm specifications; ensure correct wiring of the communication interface; do not apply excessive force to buttons.

Warranty: 36 months from the date of shipment. Coverage includes production quality issues. Fees apply for improper operation, natural disasters, or expired periods.

Frequently Asked Questions

Q1: What is the operating temperature range for this circuit breaker?

The ambient temperature should be between -5 ℃ and +40 ℃. If the temperature exceeds +40 ℃, the working current must be derated according to the technical table.

Q2: Does the device support remote communication?

Yes, it supports DL/T 645 and Modbus-RTU protocols via an RS-485 serial interface, allowing for data querying and half-duplex communication.

Q3: How adjustable is the residual current (leakage) protection?

The leakage protection is highly flexible, with thresholds adjustable from 50mA up to 1000mA and breaking times adjustable from 60ms to 1000ms.

Q4: Can this circuit breaker be used at high altitudes?

Yes, but for altitudes above 2000 meters, electrical performance (such as withstand voltage and working current) must be corrected based on the high-altitude derating table.

Q5: What types of protection does the electronic controller provide?

It provides comprehensive protection including overload long delay, short circuit short delay, short circuit instantaneous, overvoltage, undervoltage, phase loss, and residual current protection.

Q6: What is the mechanical and electrical life of the product?

The product is designed for a mechanical life of 7,000 operations and an electrical life of 1,000 operations under normal maintenance-free conditions.