Siemens vacuum contactor 3RT123TF6 working principle manual

Overview of Siemens Vacuum Contactor 3RT12/3TF6

◆Standard

IEC/EN 60947-1

IEC/EN 60947-4-1

IEC/EN 60947-5-1 (auxiliary switch)

Siemens contactors 3RT12 and 3TF68/3TF69 models are suitable for any climatic environment and they are safe according to the IEC 60529 standard. Depending on the configuration with other equipment, it may be necessary to install a terminal cover on the connecting rod. The connection method used by the vacuum contactor is screw terminal (box terminal).

If you want to switch voltage ≤110V and current ≤100mA, you should use the auxiliary contacts of Siemens vacuum contactors or 3RH contactor relays, because they can ensure a high level of contact reliability. These auxiliary contacts are especially suitable for solid-state circuits with voltage ≥ 1mA and voltage of 17V or higher.

Siemens contactors with solid-state operating mechanisms comply with international standards IEC/EN 60947-1 and IEC/EN 60947-4-1. These vacuum contactors were developed for environment A. Note: Environment A refers to private low-voltage or industrial networks/locations/factories, including high-level interference sources. Environment A corresponds to Class A equipment with CISPR 11 and EN 55011. Note: The control cables related to the converter must be routed to the converter separately from the load cable.

Basic parameters of Siemens vacuum contactor 3RT12/3TF6

In order to prevent overload, 3RB2 electronic overload relay can be installed on Siemens vacuum contactor. The rated value quoted in the rated value of the three-phase motor (in kW) refers to the output power on the motor shaft (according to the nameplate). The rated power specification of the vacuum contactor in kW is the guide value of a 4-pole standard motor under 50Hz AC and a specified voltage (such as 400V). When selecting the appropriate equipment motor current, motor protection device and allowable Siemens contactor In the case of current, the specific starting and rated data of the motor to be switched are decisive. In doing so, the utilization categories must be aligned with each other.

The surge suppression vacuum contactor can be equipped with a varistor to damp the switch overvoltage in the coil. Note: If the voltage peak of the contactor coil attenuates (varistor + 2 to 5ms), the OFF delay of the NO contact and the ON delay of the NC contact will increase. The vacuum contactor is basically not suitable for switching DC voltage.

Working principle of Siemens vacuum contactor 3RT12/3TF6

◆Siemens vacuum contactor 3RT12 (3-pole, 110 to 250kW)

AC/DC operated contactors can be operated with AC (50 to 60Hz) and DC. There are two types of solenoid valve operation:

1. Standard operating mechanism with economical circuit for AC and DC operation (switching from closed coil to holding coil) model 3RT12.

2. Solid state operation mechanism, model 3RT12.

Withdrawable coil For simple coil replacement, for example, if a replacement application is applied, the solenoid coil can be pulled up after the release mechanism is actuated, and can be replaced with any other coil of the same size. The working principle of the vacuum interrupter is compared with the 3RT10 Siemens contactor. The main contact works in the air under atmospheric conditions. The contact gap of the 3RT12 vacuum contactor is contained in a sealed vacuum circuit breaker.

Neither arc nor arc gas is generated. However, the special advantage of 3RT12 vacuum contactors is that their electrical durability is at least twice that of 3RT10 contactors. Therefore they are particularly suitable for frequent switching of jog/hybrid operations, for example in crane control systems. Auxiliary contact supplement: 3RT12 vacuum contactors of sizes S10 to S12 are equipped with laterally mounted auxiliary switch blocks. These can be equipped with up to eight lateral auxiliary contacts (same auxiliary switch blocks for S10 to S12). No more than four of them are NC contacts.

◆Siemens vacuum contactor 3TF6 (3-pole, 335 to 450kW)

Using 3TF68/3TF69 contactor contact indication working principle: With the help of 3 white double sliders on the contactor base, the contact of the vacuum circuit breaker can be checked during operation. If the distance indicated by one of the double sliders is less than 0.5 mm and the contactor is in the closed position, the vacuum circuit breaker must be replaced. To ensure maximum reliability, it is recommended to replace all 3 vacuum circuit breakers at the same time.

Reliability of auxiliary contacts: These auxiliary contacts are especially suitable for solid-state circuits with voltage ≥ 1mA and voltage of 17V or higher. Protect the main current path The integrated RC varistor connection for the main current path can suppress the switch overvoltage rise to a safe value, which can prevent multiple limits. Therefore, it can be assumed that the motor winding will not be damaged by switching the overvoltage with a steep voltage rise. During installation operations where the emission interference limit cannot be observed, such as when used for output contactors in converters, 3TF68/3TF69.. It is recommended to use Q-type Siemens contactors-no need to connect the main current path circuit.

Siemens vacuum contactor 3RT12/3TF6 application instructions

The standard contactors 3TF68 and 3TF69 under normal operating conditions are equipped with electronically controlled electromagnetic operating mechanism for AC operation, which has high anti-interference. The electromagnetic coil is connected to the varistor to prevent overvoltage. The figure below shows the electromagnetic compatibility parameters.

The above is the operating principle manual of Siemens vacuum contactor 3RT12/3TF6, I hope it can help everyone. You can log in to the okplazas.com motor mall to view Siemens related product information, welcome to e-mail: [email protected] for consultation, and you can also contact WeChat customer service online at+86- 13689242098 for product consultation!