Technical specifications

XM3L series residual current action circuit breaker (hereinafter referred to as leakage circuit breaker) is suitable for AC 50/60Hz, rated working voltage up to 400V, rated working current 16A to 630A in the power supply system with neutral point directly grounded as leakage protection, also can be used to prevent the fire hazard caused by equipment insulation damage, resulting in ground fault current. It can also be used to distribute electrical energy and protect lines and power supply equipment from damage caused by overload and short-circuit faults, as well as for infrequent starting of motors and overload and short-circuit protection.

The leakage circuit breaker has the characteristics of small size (equal to the size of the corresponding plastic case circuit breaker), high breaking, short flying arc and adjustable residual action current, etc. At the same time, it can be equipped with alarm contacts, sub-excitation striker, auxiliary contacts and other accessories, which is an ideal product for users.

The earth leakage circuit breaker can be installed vertically (i.e. vertically) or horizontally (i.e. horizontally).

This product complies with GB14048.2 idt IEC60947-2 standard.

Models and their meanings

Main Technical Parameters

Product Categories

◇By breaking capacity of circuit breaker: a Standard type (S type); b Higher type (H type)

◇According to the wiring method of the circuit breaker: a wiring in front of the board; b wiring behind the board; c plug-in type.

◇By operation mode: a direct operation by handle; b operation by turning handle; c electric operation.

◇According to the residual action current: a The residual action current is not adjustable; b The residual action current is adjustable (three stages)

◇By number of poles: two-pole; three-pole; three-pole four-wire; four-pole

◇By breaking time: general type, time-delay type

◇By application: for power distribution, for motor protection

◇Accessories: alarm contact, auxiliary contact, shunt decoupler, undervoltage decoupler

Normal working conditions

◇ The altitude of the installation site should not exceed 2000m.

◇ Ambient 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 of 24h shall not exceed +35℃.

◇Atmospheric conditions: the relative temperature of the atmosphere, not exceeding 50% at the maximum surrounding temperature of +40°C, may have a high relative humidity at lower temperatures, with a maximum monthly average relative humidity of 90% in the wettest month when the monthly average minimum temperature does not exceed +25°C, and taking into account condensation on the product surface occurring as a result of temperature changes.

◇Installation category: III.

◇Pollution class: 3

◇The external magnetic field in the vicinity of the place of installation of the earth leakage circuit breaker shall not exceed 5 times the geomagnetic field in any direction.

Main technical parameters

◇Leakage circuit breaker rating.

Note: The three levels of residual action current adjustment can be selected at will by the user.

◇Overcurrent release characteristics of leakage circuit breakers for power distribution with each pole energized at the same time in reverse time

◇Overcurrent release characteristics of leakage circuit breakers for motor protection when each pole is energized at the same time in reverse time

residual current breaking time of earth leakage circuit breakers

◇ Residual current breaking time of general type earth leakage circuit breaker

◇ Residual current breaking time of time-delay type earth leakage circuit breaker

The instantaneous action characteristic of the earth leakage circuit breaker for power distribution is set at 10ln±20%, and the instantaneous action characteristic of the earth leakage circuit breaker for motor protection is set at 12ln±20%.

Structure and working principle

This series of earth leakage circuit breakers is an electronic earth leakage circuit breaker, mainly consisting of a zero sequence transformer, an electronically controlled earth leakage decoupler and a circuit breaker with overload and short circuit protection, all parts are installed in a pair of plastic enclosures.

When there is leakage or personal electric shock in the protected circuit, as long as the residual current reaches the rectified action current value, the output signal of the secondary winding of the zero-sequence transformer triggers the SCR to conduct and the leakage circuit breaker to act through the leakage detector, thus cutting off the power to play the role of leakage and electric shock protection.

When the protected circuit is overloaded or short-circuited, the compound striker completes a delayed or instantaneous stripping action and makes the leakage circuit breaker operate, thus cutting off the power supply to play a role in overload or short-circuit protection.

Form and mounting dimensions

Ordering Instructions

◇ When ordering, specify the product type, 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, we will supply the product according to the wiring in front of the board.

◇ For example: order XMM1-225L,180A, four poles, with undervoltage and auxiliary function, quantity 10 units order indicated as: XMM1-225L/4370, 180A, 10 units.