Products & Solutions

Place of Origin: China
Brand Name: Longsun
Model Number: LTZM1E
Minimum Order Quantity: 1 pc
Delivery Time: 15 working days
Payment Terms: L/C, T/T, Western Union, etc.



Residual Current Protection Circuit Breaker


LTZM2L series residual current protection circuit breaker (hereinafter referred to as protector) is a technologically innovative patent product developed by our company in recent years to adapt to the actual environment of safe electricity consumption in urban and rural areas. It is a multi-functional intelligent comprehensive protector integrating the functions of residual current protection, circuit main switch, manual and automatic opening and closing.

LTZM2L series protectors are suitable for low-voltage power grids with three-phase four-wire neutral point directly grounded. In addition to residual current, overload, short circuit and other protections, it also has undervoltage, overvoltage, phase loss, zero loss, etc. with information data display, It is an intelligent product with multiple functions such as information and data query and storage, remote switch and control, switch status signal, prepaid meter control, etc.

This product implements GB14048.2/IEC60947-2 standard.




Normal working conditions


●Ambient temperature: -40℃~40℃;
●Relative air temperature: when the monthly average minimum temperature of the wettest month does not exceed 25°C, the monthly average maximum relative humidity of the month does not exceed 90%, and the condensation on the surface of the product due to temperature changes is taken into account;
●Altitude: no more than 2000 meters;
●Pollution level: level 3;
●Installation category: Ⅲ;
●Installation site: the external magnetic field shall not exceed 5 times of the earth’s magnetic field in any direction;



The main technical parameters


Rated voltage/frequency AC400V/50Hz three-phase four-wire system (3N)
Rated current 100A (65~100 adjustable); 250 (225A) (100~225/250 adjustable); 400A (250~400 adjustable);
630A (400~630 adjustable); 800A (630A-800A adjustable):
Rated impulse withstand voltage 8KV
Rated insulation voltage AC1KV
Rated residual operating current 100, 200, 300, 500, 1000mA
Rated residual non-operating current 0.5l△no
Automatic tracking of residual current 100~1000mA
Classification of action characteristics AC type
Rated breaking time 0.3S, 0.5S, delay type
Delay type limit non-driving time △t60ms, △t1kms
Rated undervoltage action value (105~160V) adjustable
Stabilized overvoltage action value (265~300V) adjustable
Reclosing time 20s~60s
Rated short-circuit breaking capacity See Table 1 for details
Rated short-time withstand current See Table 1 for details (Type B)
Use category Class A, Class B
Overcurrent Protection Features (See Table 2, 3)
Load Control Protection Features (See Table 4)



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