Siemens Molded Case Circuit Breaker 3VT8 Model Structure and Parameter Application

Siemens Molded Case Circuit Breaker 3VT8 Application

Various models of 3VT molded case circuit breakers are suitable for the following applications:

1. Used as input and output circuit breakers for power distribution system;

2. Used as switch and protection equipment for motors, transformers and capacitors;

3. Combined with a lockable rotary operating mechanism and terminal cover, it can be used as a main switch and an emergency stop switch.

3VT molded case circuit breakers are suitable for the following occasions:

1. Used for system protection (3 poles and 4 poles) overload and short circuit releases can be used for the protection of cables, wires and non-motors.

2. Used for motor protection (3 poles) overload and short circuit release, suitable for direct starting and better protection of three-phase squirrel cage motors.

Main features of the circuit breaker: 3VT meets the high requirements of today's power distribution system with its economy and compact design. The equipment has the characteristics of complete series, space saving and easy operation. Two models are available: thermal magnetic (10A to 630A) and electronic (250A to 630A).

Siemens circuit breaker 3VT meets the following standards:

1. GB/T 14048.1, IEC 60947-1MOD;

2. GB/T 14048.2, IEC 60947-2IDT;

3. GB/T 14048.4, IEC 60947-4-1MOD;

4. GB/T 14048.5, IEC 60947-5-1MOD.

The circuit breaker can withstand various weather tests. This circuit breaker is designed to be used in enclosed places where there is no harsh working conditions (such as dust, corrosive steam and harmful gases). When installing in dusty and humid places, a suitable enclosure must be provided. All Siemens molded case circuit breakers with thermal-magnetic trips meet use category A, and all with electronic trips meet use category B.

The protection levels of Siemens circuit breakers 3VT are as follows:

1. Fixed: IP20;

2. Fixed type of screw connection behind the board: IP40;

3. Plug-in base/withdrawable type: IP40;

4. Plug-in base/drawable-fixed base: IP20.

Siemens Molded Case Circuit Breaker 3VT8 Design

1. The rated current range is 10A-630A;

2. When the temperature is 40°C, there is still no need for derating or performance loss;

3. Electronic overcurrent release, 250A and above (VT250);

4. Three types of internal accessories;

5. Complete external accessories;

All circuit breakers are supplied in complete sets with integrated overcurrent releases. Auxiliary contacts, alarm contacts or auxiliary releases can be factory assembled, and the current breaking capacity is indicated on the front of each circuit breaker.

6. Standard breaking capacity: Icu=25-35kA, AC 50Hz 400V;

7. High breaking capacity: Icu=50kA, AC 50Hz 400V;

8. Very high breaking capacity: Icu=65kA, AC 50Hz 400V.

Siemens molded case circuit breaker 3VT8 model

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Siemens molded case circuit breaker 3VT8 function

3VT is designed according to the principle of contact magnetic repulsion. The contact opens before the expected peak value of the short-circuit current. Its current-limiting function will effectively protect the system components from the thermal and dynamic effects of the short-circuit current during electrical faults. The ground fault release "g" can detect the fault current that flows through the ground terminal and can cause a fire in the workshop. Several plastic case circuit breakers connected in series can achieve selective protection with adjustable delay time.

Siemens molded case circuit breaker 3VT8 parameters

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.

Siemens molded case circuit breaker 3VT8 connector

The circuit breakers of this series are equipped with input and output front connection bus bars, which are usually suitable for fixed copper bars, copper braids or cables, and are also suitable for standard bus bar connections. And its incoming and outgoing connections can be arbitrarily selected, and can be used for front or rear connections, while the technical parameters remain unchanged. The uninsulated wire connected to the inlet end must be insulated within the arcing distance above the arc extinguishing chamber. For this purpose, you can use a phase spacer or terminal cover. For 3VT series Siemens molded case circuit breakers, the internal accessories (auxiliary trip, auxiliary contacts and alarm contacts) are provided with terminal screws. For all 3VT L series circuit breakers, auxiliary releases (shunt release and undervoltage release) as well as auxiliary contacts and alarm contacts can be easily connected on site. The electric operating mechanism is always Equipped with wiring terminals.

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 main components of VT63 and VT100 circuit breakers are three conductive circuits with input and output terminals. The configuration of static and moving contacts enables the magnetic repulsion of the contacts to be applied under short-circuit conditions. This series of Siemens circuit breakers are used in conjunction with arc extinguishing chambers to generate a dynamic impedance and limit the current. This effect reduces the destructive effect caused by I2t and Ip energy during short-circuit. The trip unit is assembled at the factory, and is equipped with a fixed overload release and a fixed short-circuit release. The auxiliary release and auxiliary contacts can be installed on the right and left of the circuit breaker operating mechanism.

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 current loop layout, contact configuration, breaking mechanism layout and internal accessories of the VT160 type circuit breaker are the same as those of VT63 to VT100. The trip unit of the VT160 circuit breaker has the following characteristics: thermal magnetic overcurrent trip The device has a fixed or adjustable overload release and a fixed short-circuit release.

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.

VT250 to VT400 types of circuit breaker current circuit layout, contact configuration and breaking mechanism layout and internal accessories are the same as VT63 to VT160. The trip units from VT250 to VT400 have the following characteristics:

1. The thermal magnetic overcurrent release has a fixed or adjustable overload release and a fixed short-circuit release.

2.The electronic overcurrent release has an adjustable overload release and a short-circuit release. (VT250 4P has no electronic type)

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 current loop layout, breaking mechanism layout and internal accessories of the VT630 model circuit breaker are the same as those of VT63 to VT400. VT630 has both electronic trip unit and thermal magnetic trip unit. The thermal magnetic release has a fixed overload release and a fixed short-circuit release. The electronic overcurrent release has an adjustable overload release and a short-circuit release.

Siemens molded case circuit breaker 3VT8 structure

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.

Note:

1. 3VT plastic case circuit breaker; 2. Thermal magnetic overcurrent release; 3. Electronic overcurrent release;

5. Undervoltage release; 5. Shunt release; 6. Auxiliary contact/alarm contact;

6. Electric operating mechanism; 8. Rotating handle operating mechanism; 9. Directly rotating handle operating mechanism on the front panel;

10. The base of the plug-in circuit breaker; 11. Withdrawable type; 12. Phase partition plate; 13. Terminal cover;

14. The front wiring bus bar of the extended type board.

Siemens Molded Case Circuit Breaker 3VT8 Wiring Diagram

Wiring diagram of electric operating mechanism for VT160 to VT630 type circuit breakers

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.

Note: SB1-closing button (prepared by the user), SB2-opening button (prepared by the user), Us-control power, P1 P2-terminal number, S1...S4-terminal number.

Wiring diagram of undervoltage release for VT63 to VT630 circuit breakers

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.

Note: URV-undervoltage release, Us-control power supply, P1 P2-terminal number.

Only the dotted line is connected by yourself, and the rest of the wiring has been connected by the manufacturer for reference only.

Wiring diagram of shunt release for VT63 to VT630 circuit breakers

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.

Note: SB2-opening button (provided by the user), P3P4-terminal number, Us-control power supply, OFF-auxiliary contact.

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