Schneider molded case circuit breaker NSC series selection parameters and accessories description

Schneider Molded Case Circuit Breaker NSC Series Overview

This type of molded case circuit breaker is for industrial control and OEM manufacturing. Its rated operating current is 15A to 630A, and the number of poles it has is 3 poles and 4 poles. Schneider molded case circuit breakers mainly play various industrial equipment protection, industrial control panel protection and motor protection functions. They are often used in the plastic machinery industry, textile industry, machine tool industry, lifting and elevator industries, and then construction machinery In the fields of, air conditioning, heating, and water treatment pump industry, the modular system composition of NSC series molded case circuit breakers is shown in the figure below.

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Note: The accessories with orange background are suitable for 60 to 100A models, and the accessories with blue background are suitable for 160 to 630A models.

Schneider Molded Case Circuit Breaker NSC Series Selection

◆The selection of NSC circuit breaker (applicable to power distribution protection sites) is shown in the figure below.

Transmitter|Encoder|Soft starter|Power supply|VFD|Light curtain|Servo products|Human-machine interface|Solenoid valve|Cylinder|Actuator|Flow meter|Transformer|Thyristor|Sensor|Deceleration drive gearbox reducer|Linear guide|Circuit breaker|Refrigeration compressorAll industrial products of okplazas are purchased from the original factory or formal channels of agents to ensure the original authenticity, which perfectly solves the problem of industrial product sample procurement and small-batch procurement for the majority of engineers and purchasing personnel.

◆The selection of NSC circuit breaker (applicable to motor protection sites) is shown in the figure below.

Transmitter|Encoder|Soft starter|Power supply|VFD|Light curtain|Servo products|Human-machine interface|Solenoid valve|Cylinder|Actuator|Flow meter|Transformer|Thyristor|Sensor|Deceleration drive gearbox reducer|Linear guide|Circuit breaker|Refrigeration compressorAll industrial products of okplazas are purchased from the original factory or formal channels of agents to ensure the original authenticity, which perfectly solves the problem of industrial product sample procurement and small-batch procurement for the majority of engineers and purchasing personnel.

Schneider Molded Case Circuit Breaker NSC Series Features

◆NSC series molded case circuit breakers and auxiliary equipment meet the following standards:

1. General provisions of IEC60947-1;

2. IEC60947-2 circuit breaker;

3. GB14048.1;

4. GB14048.2;

5. Conform to NEMA/JIS/CE standards at the same time;

6. The circuit breaker body below 400A conforms to the EU RoHS directive.

◆NSC series Schneider circuit breakers have an anti-pollution level of three and can operate in a three-level pollution environment defined in the IEC60947 standard (industrial environment).

◆Environmental protection factors are fully considered in the manufacturing process, so most of the parts involved can be recycled and reused. Molded case circuit breaker bodies below 400A meet the standard requirements of the RoHS directive.

◆The circuit breaker can be installed at an ambient temperature of -25°C to +70°C. If the temperature is higher than 50°C, it should be considered for derating. The 630A specification is used when the temperature is higher than 40°C. We must consider derating.

◆Schneider molded case circuit breakers NSC series have passed the harsh environment test specified in the following standards:

1. IEC60068-2-1 dry cooling (-55℃);

2. IEC60068-2-2 dry heat (+85℃);

3. IEC60068-2-30 Humidity and heat (95% relative humidity at 55°C).

◆The isolation function of all circuit breakers in the series should comply with the IEC60947-2 standard:

1. The isolation position corresponds to "O" (OFF position);

2. Only when the contact is actually opened, the operating handle can indicate the "OFF" position;

3. The padlock can be installed only when the contact is opened;

4. Installing a rotating handle will not change the reliability of the contact system.

◆The isolation function of NSC series molded case circuit breakers guarantees: the mechanical reliability of the contact indication system, no leakage current and the overvoltage tolerance between the terminals of the incoming and outgoing wires.

◆The description of the standard features marked on the nameplate is shown in the figure below

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1. Ui: Rated insulation voltage;

2. Uimp: rated impulse withstand voltage;

3. Ue: Rated working voltage;

4. Icu: Ultimate breaking capacity;

5. In: rated current;

6. Cat: Use category;

7. Symbol: with isolation function.

◆Why is there a maximum allowable temperature rise?

Molded case circuit breakers are generally formed for a certain period of time according to the largest rated current in the frame class current, and its various parts must not exceed the specified value when the temperature rises. Because the operating temperature of the various parts of the equipment and the insulating medium will have a direct impact on the changes in the physical and chemical properties of the material, all when the temperature exceeds a certain range, the mechanical and electrical properties of the molded case circuit breaker will appear sharply The situation of decline causes the service life to be reduced. The allowable temperature of different materials and working parts is different. The principle of determining the allowable temperature is to ensure that the equipment can work reliably during the design and use period.

◆Schneider molded case circuit breaker NSC series can be installed in different types of switch panels, and can also be installed horizontally, vertically, lying flat, etc., without reducing or affecting its electrical performance.

◆The circuit breaker can resist mechanical vibration and shock. It is tested under the requirements of IEC6068-2-6 and JISC8370/8371 Commercial-Marine Inspection. The amplitude of the device from 2 to 13 Hz is ±15 mm, and it will continuously accelerate 1g in the range of 13 to 100 Hz, and it will continuously accelerate 2g at 16.7 Hz.

◆NSC series molded case circuit breakers can be wired from different directions up and down, and the reverse wiring will not affect its electrical performance.

◆The circuit breakers of model specifications from 15A to 630A have only three external dimensions, which are suitable for all setting values ​​and breaking capacity. Among them, the 60/100A series are relatively small in external dimensions among similar products in the world. The specific dimensions are shown below .

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◆Release selection: Schneider NSC series 60/100/160/250/400A molded case circuit breakers are equipped with thermomagnetic (TM) trips, which can provide overload and short-circuit protection functions during operation. The 630A specification device is equipped with an electronic (STR) trip unit, which can provide overload and short-circuit protection, but the current setting of short-circuit protection is 2 to 10 times the adjustable range.

◆When the altitude is lower than 2000 meters, the characteristics of Osmart NSC series molded case circuit breakers will not be affected. However, if the altitude exceeds this value, the air insulation characteristics and cooling capacity must be considered. The specific derating parameters are shown below.

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◆The working principle of the thermal magnetic trip unit of the circuit breaker: It has two stages of protection, namely overload and short-circuit transient. The thermal protection adopts the principle of bimetallic sheet, which is to weld two metal sheets with different thermal expansion coefficients together. When an overload fault occurs, the bimetal in the thermal magnetic trip unit of the Schneider molded case circuit breaker is heated to a certain degree of bending and deformation, and it will be touched or pushed against the trip mechanism to cause the circuit breaker to trip. If the circuit is short-circuited, the armature of the electromagnetic system of the release is attracted by the iron core, driving the release lever to prompt the device to perform the breaking action.

Schneider Molded Case Circuit Breaker NSC Series Parameters

◆NSC circuit breaker parameters (applicable to low-voltage distribution protection) are shown in the figure below.

Transmitter|Encoder|Soft starter|Power supply|VFD|Light curtain|Servo products|Human-machine interface|Solenoid valve|Cylinder|Actuator|Flow meter|Transformer|Thyristor|Sensor|Deceleration drive gearbox reducer|Linear guide|Circuit breaker|Refrigeration compressorAll industrial products of okplazas are purchased from the original factory or formal channels of agents to ensure the original authenticity, which perfectly solves the problem of industrial product sample procurement and small-batch procurement for the majority of engineers and purchasing personnel.

◆NSC circuit breaker parameters (applicable to motor protection) are shown in the figure below.

Transmitter|Encoder|Soft starter|Power supply|VFD|Light curtain|Servo products|Human-machine interface|Solenoid valve|Cylinder|Actuator|Flow meter|Transformer|Thyristor|Sensor|Deceleration drive gearbox reducer|Linear guide|Circuit breaker|Refrigeration compressorAll industrial products of okplazas are purchased from the original factory or formal channels of agents to ensure the original authenticity, which perfectly solves the problem of industrial product sample procurement and small-batch procurement for the majority of engineers and purchasing personnel.

Schneider molded case circuit breaker NSC series accessories

1. Indicating switch: auxiliary switch AX (ON/OFF)-indicating the contact position of the circuit breaker, alarm switch AL (trip indication)-indicating that the circuit breaker has been released due to overload, short circuit, and voltage coil action. Buckle, multi-function auxiliary switch (alarm auxiliary switch)-has both auxiliary switch and alarm switch functions.

2. Trip coil: Shunt trip (SHT) or undervoltage trip (UVR).

3. Direct rotating handle: suitable for isolation, indicating three positions O (OFF), I (ON) and tripping. Use 1 to 3 locks with a diameter of φ5 to φ8mm (not provided) to lock the molded case circuit breaker in the OFF position. The cabinet door cannot be opened when the circuit breaker is in the ON position. If the cabinet door is opened, the circuit breaker cannot be opened. Close up.

4. Extend the rotating handle: make the equipment can be operated from the front of the switch cabinet, suitable for isolation.

5. Others: padlock system, phase spacer, terminal sheath, bare cable connector (for 60/100A specifications).

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