The XM3L series residual current operated circuit breaker (hereinafter referred to as residual current circuit breaker) is suitable for use in power supply systems with AC 50/60Hz, rated working voltage up to 400V, and rated working current of 16A to 630A, where the neutral point is directly grounded. It is used for residual current protection and can also be used to prevent fire hazards caused by grounding fault currents due to equipment insulation damage. And it can be used to distribute electrical energy and protect lines and power equipment from damage caused by overload, short circuit and other faults. It can also be used for infrequent starting and overload/short circuit protection of electric motors.
This residual current circuit breaker has the characteristics of small size (equivalent to the corresponding molded case circuit breaker), high breaking height, short arcing, and adjustable residual operating current. It can also be equipped with accessories such as alarm contacts, shunt release devices, and auxiliary contacts, making it an ideal product for users.
The residual current circuit breaker can be installed vertically or horizontally.
This product complies with GB14048.2 idt IEC60947-2 standard.
Model and its meaning

Main technical parameters

CLASSIFICATION
◇ Divided by the breaking capacity of the circuit breaker: A standard type (S type); B Higher type (H-type)
◇ According to the wiring method of the circuit breaker: a board front wiring; Wiring behind board B; C plug-in type;
◇ Divided by operation mode: a. Directly operate the handle; B Rotate the handle for operation; C Electric operation;
◇ Divided by residual operating current: a. The residual operating current cannot be adjusted; The remaining operating current of b can be adjusted (three levels)
◇ Divided by number of poles: Two poles; Three poles; Three poles and four wires; quadrupole
◇ Divided by interruption time: general type, delayed type
◇ Classified by purpose: for power distribution, for protecting electric motors
◇ Classified by attachments: alarm contact, auxiliary contact, shunt release, undervoltage release
operational condition
The altitude of the installation location shall not exceed 2000m.
◇ Surrounding air temperature; The upper limit of ambient air temperature shall not exceed+40 ℃; The lower limit shall not be lower than -5 ℃; The average value over 24 hours shall not exceed+35 ℃;
◇ Atmospheric conditions: The relative temperature of the atmosphere should not exceed 50% at a maximum ambient temperature of+40 ℃, and there can be higher relative humidity at lower temperatures. When the average lowest temperature in the wettest month does not exceed+25 ℃, the average maximum relative humidity for that month should be 90%, taking into account the condensation that occurs on the surface of the product due to temperature changes.
Installation category: III.
Pollution level: 3
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.
Main technical parameters
◇ Rated value of residual current circuit breaker:

Note: The three levels of residual action current adjustment can be arbitrarily selected by the user.
The inverse time limit breaking action characteristics of residual current circuit breakers for power distribution when all poles of the overcurrent release are energized simultaneously

The inverse time limit breaking action characteristics of the overcurrent release of the residual current circuit breaker for motor protection when all poles are energized simultaneously

Remaining current breaking time of residual current circuit breaker
◇ Remaining current breaking time of general residual current circuit breakers

◇ Remaining current breaking time of delay type residual current circuit breaker

The instantaneous action characteristics of the residual current circuit breaker for distribution are set to 10ln ± 20%, and the instantaneous action characteristics of the residual current circuit breaker for motor protection are set to 12ln ± 20%.
Structure and Working Principle
This series of residual current circuit breakers is an electronic residual current circuit breaker, mainly composed of zero sequence transformers, electronically controlled residual current release devices, and circuit breakers with overload and short-circuit protection. All components are installed in a pair of plastic housings.
When there is leakage or personal electric shock in the protected circuit, as long as the residual current reaches the set action current value, the output signal of the secondary winding of the zero sequence transformer triggers the thyristor to conduct, and the leakage circuit breaker is activated through the leakage release device, thereby cutting off the power supply and providing leakage and electric shock protection.
When the protected circuit experiences overload or short circuit, the compound release completes delayed or instantaneous tripping action, causing the residual current circuit breaker to operate, thereby cutting off the power supply and providing overload or short circuit protection.

Appearance and installation dimensions



Ordering Instructions
When placing an order, please specify the product model, rated current, internal accessories (see table), number of poles, type of protection (distribution protection, motor protection), quantity, etc. If no special wiring method is specified, our company will supply according to the pre board wiring.
For example, ordering XMM1-225L, 180A, four poles, with undervoltage and auxiliary functions, quantity 10 units, the order is represented as: XMM1-225L/4370，180A， 10 units.