Siemens circuit breaker overcurrent release and function

Siemens circuit breaker overcurrent release

◆Overcurrent protection setting

Caution: Adjust the parameters only when the Siemens circuit breaker is off. If you modify the parameters when the circuit breaker is on, you may accidentally trip the circuit breaker.

Caution: When planning the project and considering selectivity, you must ensure that the load on the circuit breaker does not exceed the breaking capacity specified in the 3WT circuit breaker catalog. To a certain extent, upstream protection equipment must be installed to safely interrupt these faults.

Adjust all parameters through the rotary coding switch.

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◆Overcurrent release ETU35WT

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As long as the overcurrent release has been activated for more than 20 minutes before tripping, the trip cause will be saved for at least two days.

Note: To protect equipment affected by static electricity, a closed protective cover must be placed on the test socket. Before removing the protective cover, the Siemens circuit breaker must be grounded and the operator must have the same potential. Protective function:

●LT: overload protection (long delay), L trip;

●ST: short time delay short circuit trip (short time delay), S trip;

●INST: Instantaneous short-circuit trip (instantaneous), I trip.

Siemens circuit breaker overcurrent release ETU35WT characteristic curve The figure below only shows the setting range of different parameters, here does not consider the tolerance range, L, S, I trip operation.

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For a unipolar load in the minimum rated current range, the short-circuit trip response time increases by about 10%, and the trip time increases by about 15% according to the characteristic curve.

◆Overcurrent release ETU37WT

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.

As long as the overcurrent release has been activated for more than 20 minutes before tripping, the trip cause will be saved for at least two days.

Note: To protect equipment affected by static electricity, a closed protective cover must be placed on the test socket. Before removing the protective cover, the Siemens circuit breaker must be grounded and the operator must have the same potential.

Protective function:

●LT: overload protection (long delay), L trip;

●ST: short time delay short circuit trip (short time delay), S trip;

●INST: Instantaneous short circuit trip (instantaneous), I trip;

●GF: Ground fault protection (ground fault), G trip;

●N: Neutral line protection (neutral line), N tripping.

Siemens circuit breaker overcurrent release ETU37WT characteristic curve The figure below only shows the setting range of different parameters, here does not consider the tolerance range, L, S, I, N trip operation.

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For unipolar loads in the minimum rated current range, the short-circuit trip response time increases by approximately 10%, and the trip time increases by approximately 15% according to the characteristic curve.

G trip operation (picture)

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.

Due to the activation limit of 150A (FSI) and 200A (FSII), a unipolar load cannot guarantee a ground fault response value of 100A. In this case, the minimum response value Ig=300A.

◆Overcurrent release ETU45WT

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.

As long as the overcurrent release has been activated for more than 20 minutes before tripping, the trip cause will be saved for at least two days.

Note: To protect equipment affected by static electricity, a closed protective cover must be placed on the test socket. Before removing the protective cover, the Siemens circuit breaker must be grounded and the operator must have the same potential.

Protective function:

●LT: overload protection (long delay), L trip;

●ST: short time delay short circuit trip (short time delay), S trip;

●INST: Instantaneous short circuit trip (instantaneous), I trip;

●N: Neutral line protection (neutral line), N tripping.

Siemens circuit breaker overcurrent release ETU45WT characteristic curve The figure below only shows the setting range of different parameters, here does not consider the tolerance range, L, N trip operation.

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.

S tripping operation (picture)

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.

For a unipolar load in the minimum rated current range, the short-circuit trip response time increases by about 10%, and the trip time increases by about 15% according to the characteristic curve.

I tripping operation (picture)

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.

For unipolar loads in the minimum rated current range, the short-circuit trip response time of the circuit breaker increases by approximately 10%, and the trip time increases by approximately 15% according to the characteristic curve.

◆Overcurrent release ETU47WT

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.

As long as the overcurrent release has been activated for more than 10 minutes before the trip, the trip cause will be stored for at least two days, and the switch is on the side of the ETU.

Note: To protect equipment affected by static electricity, a closed protective cover must be placed on the test socket. Before removing the protective cover, the Siemens circuit breaker must be grounded and the operator must have the same potential.

Protective function:

●LT: overload protection (long delay), L trip;

●ST: short time delay short circuit trip (short time delay), S trip;

●INST: Instantaneous short circuit trip (instantaneous), I trip;

●GF: Ground fault protection (ground fault), G trip;

●N: Neutral line protection (neutral line), N tripping.

L, N tripping operation (picture)

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.

S tripping operation (picture)

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.

For a unipolar load in the minimum rated current range, the short-circuit trip response time increases by about 10%, and the trip time increases by about 15% according to the characteristic curve.

I tripping operation (picture)

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.

For a unipolar load in the minimum rated current range, the short-circuit trip response time increases by about 10%, and the trip time increases by about 15% according to the characteristic curve.

G trip operation (picture)

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.

Due to the activation limit of 150A (FSI) and 200A (FSII), a unipolar load cannot guarantee a ground fault response value of 100A. In this case, the minimum response value Ig=300A.

Basic protection function of Siemens circuit breaker

Even without additional auxiliary power, the protection function of the overcurrent release is effective. The required electrical energy is provided by a current transformer integrated in the Siemens circuit breaker. To evaluate the current, the root mean square value is calculated through the electronic components of the overcurrent release, and the parameter adjustment of the individual functions is realized through the rotary coding switch.

Description:

◆Tolerance of setting current

L: Trip operation between 1.05 and 1.2 x IR;

S: -0%, +20%;

I: -0%, +20%;

G: -0%, +20%.

◆Tolerance of trip time

L: -20%, +0%, for I2t characteristics;

S: -0%, +60ms or 0%, +10%, the characteristic of fixed delay time;

I: <50ms;

G: -0ms, +60ms or -0%, +10%, for the characteristics of fixed delay time.

◆LT: overload protection (long delay), L trip

The set value IR determines the maximum continuous current that the Siemens circuit breaker can operate without tripping, and the delay class tR determines how long the overload can last without causing a trip.

◆ST: short time delay short circuit trip (short time delay), S trip

For overcurrent releases, tripping caused by short-circuit current Isd can delay tsd. In this way, the selectivity of short-circuit protection can be achieved through multiple setting options in the switchgear.

◆Motor protection function

When the circuit breaker is set to tsd=(0.02 s), the special protection function of the electric drive will be activated. It will prevent short-time delay short-circuit tripping when the motor input current reaches the peak value, and at the same time activate the phase failure protection, and the internal and arithmetic simulation time constants of the temperature rise and cooling process are switched from equipment protection to motor protection.

ETU35WT and ETU37WT: When the motor protection function is activated, the delay level is also set as follows, that is, regardless of whether the default setting value tR is 10s or not, the overload protection trip time is 11.2s@7xIR, that is to say at level 20 (6＜tp＜=20s) within the tolerance range.

ETU45WT and ETU47WT: When the motor protection is activated, the delay level will not be automatically affected. In order to make the overload protection trip time within the tolerance range of class 20, the parameter tR is set to 17s.

◆Short-term characteristics

Overcurrent releases ETU45WT and ETU47WT support switching from constant delay time to I2t characteristics. Therefore, when I2tsd is unchanged, the delay time depends on the short-circuit current, thereby increasing the selectivity of the downstream fuse.

◆INST: Instantaneous short circuit trip (instantaneous), I trip

Exceeding the set value Ii will cause the circuit breaker to trip immediately.

◆GF: Ground fault protection (ground fault), G trip

If the Siemens circuit breaker overcurrent release is equipped with a ground fault protection function, it can protect electrical equipment from excessive ground fault current. Ground fault detection can be achieved in two ways:

● Through the vector sum of the current in the external wire and the N wire

●For ETU47WT: Use a separate current transformer 1200A:1A to directly measure the ground fault current response value Ig and the delay time tg to determine whether the connection is disconnected due to a ground fault.

◆Earth fault characteristics

The ground fault protection of the overcurrent release ETU47WT supports switching from a constant delay time to the I2t characteristic. This will cause the delay time of the tripping characteristic to depend on the current when the I2tg value is constant, and will increase the selectivity of the multi-level switchgear for ground fault protection.

◆N: Neutral line protection (neutral line), N tripping

Siemens circuit breaker overcurrent release ETU37WT...ETU47WT can realize the overload protection of the neutral line. For this, a current transformer for the neutral line is required. The time delay level applicable to overload tripping is also applicable to this tripping.

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