Scope of application 

SMGB1L-125 series leakage circuit breakers are suitable for AC 50Hz, rated voltage single-pole two-wire, bipolar 230V, three-pole, three-pole four-wire, four-pole 400V, rated current from 63A to 125A. When the current exceeds the specified value, the residual current operated circuit breaker can cut off the fault power in a very short time, protect the safety of the personal and electrical equipment, protect the overload and short circuit of the line and the motor, And the motor is not frequent use of start.

This product complies with GB14048.2 and IEC60947-2 standards.

Model and meaning 

Structure characteristics
SMGB1L-125 series leakage circuit breakers from SMGB1-125 high breaking circuit breakers and leakage from the assembled. Leakage circuit breaker is a current-operated electronic leakage circuit breaker, mainly by the zero-sequence current transformer, electronic components board, leakage release and with overload and short circuit protection circuit breaker.

The main technical parameters 


Residual current action of the breaking time (general type) 

Normal operating conditions and installation conditions 

○ Ambient air temperature -5 ℃ ~ 40 ℃, 24h the average does not exceed +35 ℃;

○ Altitude: The altitude of the installation site should not exceed 2000m.

○ Atmospheric conditions: The air relative humidity at the installation site does not exceed 50% at the maximum temperature + 40 ° C and allows a relatively high relative humidity at a lower temperature, for example 90% at 20 ° C, taking into account the temperature change Take the necessary measures in the condensation on the product;

○ Installation Category: Ⅲ;

○Pollution degree: Grade 3;

○ Installation Type: TH35-7.5 steel installation rail installation;

○ installation conditions: the installation site of the external magnetic field in any direction should not exceed 5 times the earth magnetic field; residual current action circuit breakers should generally be installed vertically, the inclination of the azimuth of not more than 5 °, handle up for the power position; There should be no significant impact and vibration.

Overcurrent trip characteristic 

Appearance and installation dimensions (mm)