● Scope of Application
The BZM1L Series Residual Current Circuit Breakers are among the new-type residual current protection products independently designed and developed by our company, incorporating internationally advanced technologies. They are applicable to AC 50Hz circuits with a rated voltage up to 400V and a rated current ranging from 16A to 800A.
Their main function is to provide indirect contact protection against fatal electric shocks to human bodies. Residual current circuit breakers with a rated residual operating current not exceeding 0.03A can also serve as supplementary protection for direct contact when other protective measures fail, but they shall not be used as the sole protection device for direct contact. Meanwhile, these devices can prevent electrical fires caused by earth fault currents, protect circuits against overloads and short circuits, and also be used for infrequent circuit switching.
The residual current circuit breakers feature compact size, high breaking capacity, short arc-extinguishing distance, as well as adjustable rated residual operating current and residual current operation. They can be equipped with various accessories, including alarm contacts, shunt release, auxiliary contacts, rotary handle operating mechanism, and electric operating mechanism. Multiple wiring methods are available, such as front connection, rear connection, and plug-in connection. These characteristics make them ideal products for users.
The residual current circuit breakers can be installed either vertically or horizontally.
This product complies with the standards of GB 14048.2 and IEC 60947-2.
● Normal Operating Environment and Installation Conditions
○ Upper limit of ambient air temperature: +40℃; Lower limit: -5℃; The 24-hour average temperature shall not exceed +35℃.
○ Altitude: The altitude of the installation site shall not exceed 2000 m.
○ Pollution degree: 3
○ Installation category: III
○ Atmospheric conditions: The relative humidity of the atmosphere shall not exceed 50% when the ambient air temperature is +40℃; higher relative humidity is allowed at lower temperatures. The monthly average maximum relative humidity of the wettest month is 90%, while the monthly average minimum temperature of the same month is +20℃. In addition, condensation on the product surface caused by temperature changes shall be taken into account.
○ External magnetic field: The external magnetic field near the installation site of the residual current circuit breaker shall not exceed 5 times the geomagnetic field in any direction.
○ Environment: The installation site shall be free of explosion hazards and conductive dust, and the medium shall not contain gases or substances sufficient to corrode metals and damage insulation.
● Main Technical Parameters
Rated Values of Residual Current Circuit Breakers

Model	Rated Current of Frame Size Inm A	Rated Current Inm A	Rated Operating Voltage Un V	Number of Poles	Rated Residual Operating Current I △ n mA	Rated Residual Non-operating Current I △ n mA	Rated Ultimate Short-Circuit Breaking Capacity Icn KA	Rated Service Short-Circuit Breaking Capacity Ics KA	Arc-Extinguishing Distance mm
BZM1L-100L	100	16、20、25、32、40、50、63、80、100	230 400	2、3、4	30、50、100、200、300、500	15、25、50、100、150、250	35	18	≤ 50
BZM1L-100M	100	16、20、25、32、40、50、63、80、100	400	4	30、50、100、200、300、500	15、25、50、100、150、250	50	25	≤ 50
BZM1L-225L	225	100、125、160、180、200、225	400	3、4	30、50、100、200、300、500	15、25、50、100、150、250	35	18	≤ 50
BZM1L-225M	225	100、125、160、180、200、225	400	4	30、50、100、200、300、500	15、25、50、100、150、250	50	25	≤ 50
BZM1L-400L	400	225、250、315、350、400	400	4	50、100、200、300、500	25、50、100、150、250	50	25	≤ 100
BZM1L-400M	400	25、250、315、350、400	400	4	50、100、200、300、500	25、50、100、150、250	65	32.5	≤ 100
BZM1L-630L	630	400、500、630	400	4	100、200、300、500、1000	50、100、150、250、300	50	25	≤ 100

Note: The three-level adjustable residual operating current can be freely selected by the user.