SJKM1L-250/4300 plastic shell circuit breaker with residual current protection

Scope of application
SJKM1LE plastic shell circuit breaker with residual current protection (hereinafter referred to as the circuit breaker) is one of the new circuit breakers developed and researched by our company using advanced design software and manufacturing technology. Its rated insulation voltage is 800V, suitable for infrequent switching and motor starting in circuits with AC 50Hz, rated working voltage of 400V, and rated working current value of 800A. Circuit breakers have The overload, short circuit, and undervoltage protection functions can protect the circuit and power equipment from damage, and also provide protection against potential fire hazards caused by long-term grounding faults that can be detected by the overcurrent protection unit
Circuit breakers are classified into two types based on their rated short-circuit breaking capacity (LCU): M-type (higher breaking type) and H-type (high breaking type). This circuit breaker has the characteristics of small size, high breaking height, short arcing, and anti vibration
This circuit breaker can be installed vertically or horizontally
This circuit breaker cannot be reversed, that is, only 1, 3, and 5 are allowed to be connected to the power line, and 2, 4, and 6 are allowed to be connected to the load line
Circuit breakers are suitable for isolation, represented by the symbol: one/x
This circuit breaker product complies with the following standards
IEC60947-1 and GB14048.1-2006 General Principles IEC60947-2 and GB14048.2-2008 Low Voltage Circuit Breakers and Appendix B Circuit Breakers with Residual Current Protection IEC60947-4-1 and GB14048.4-2003 Low voltage electromechanical contactors and motor starters

Product Classification
◆ Divided into three poles and four poles according to the number of poles of the product. There are four types of neutral pole (N-pole) in a four pole circuit breaker:
Type A: The N-pole is not equipped with an overcurrent release, and the N-pole is always connected without being connected or disconnected together with other three poles
Type B: The N-pole does not have an overcurrent release installed, and the N-pole is connected and disconnected together with the other three
Type C: The N-pole is equipped with overcurrent release, and the N-pole is connected and disconnected together with the other three poles
D-type: The N-pole is equipped with an overcurrent release, and the N-pole is always connected without being connected or disconnected together with the other three poles
◆ Classified by purpose: A. for power distribution, B. for motor protection
◆ Divided by residual current interruption time: A: non delayed type, B: delayed type
◆ According to the connection method, it can be divided into three types: board front connection, board back connection, and plug-in disconnection
The types of power release devices are divided into two types: thermal electromagnetic (compound) type and electromagnetic (instantaneous) type
◆ Operation methods: A. Direct operation with handle, B. Rotary handle operation (for switchgear, represented by Z), C. Motor operation (represented by D)
Normal usage conditions
The upper limit of ambient air temperature shall not exceed+40 ℃; The lower limit shall not be lower than -5 ℃; The average value within 24 hours shall not exceed+35 ℃
Note: Circuit breakers used under conditions where the ambient air temperature is above+40C or below -5C should be negotiated with the manufacturer
The altitude of the installation location shall not exceed 2000m
The relative humidity of the atmosphere should not exceed 50% at the highest ambient temperature of+40 ℃, and higher relative humidity can be achieved at lower temperatures (such as 90% at 20 ℃), taking into account condensation on the surface of the product due to temperature changes



Structure and working principle
◆ Structure
This series of circuit breakers is an electronic current operated residual current protection device. The main components include: (including overcurrent release), zero sequence current transformer, electronic amplification component, leakage release, testing device, all of which are housed in a plastic casing
◆ Working principle When there is leakage or electric shock in the protected circuit, the zero sequence current transformer has a signal output. When the signal output reaches a value, it triggers the thyristor to conduct, which is the action of the leakage release device. This drives the traction rod to disconnect the operating mechanism in a short time, cutting off the power flow and achieving the leakage protection function (the working principle is shown in the figure below)









Ordering Notice
When placing an order, the user must specify the following:
◇ Model, name, and number of poles of the circuit breaker
Rated current of circuit breaker
The accessory name, specification, and combination code of the circuit breaker; When using undervoltage release and shunt release, the voltage value of the working voltage (or control power supply voltage) should be indicated; When using an electric operating mechanism, it should be indicated as a regular or electronic type
◇ Purpose: for power distribution (not specified as delivery for power distribution), for motor protection (indicated by 2)
◇ Wiring method: pre board wiring (not specified for delivery according to pre board wiring), pre board wiring. Insertion type
Quantity
For example: SJKM1LE-125, standard type L, three pole, with a rated current of 100A for the release, equipped with a shunt release with a voltage of AC 400V and alarm contacts, for power distribution, pre board wiring, a total of 20 units