Siemens 3WT Circuit Breaker Manual

Brief introduction of Siemens 3WT circuit breaker

Generally speaking, the rated voltage of the equipment has two specifications, which are 500V and 690V respectively, and the current coverage of Siemens circuit breaker 3WT is between 400A and 4000 (3800)A. Its installation method can be divided into two types: fixed and withdrawable. Its breaking capacity can reach up to 66KA, which is generally suitable for 2500KVA capacity transformer system.

The accessories of the full range of Siemens 3WT circuit breakers are universal, which can effectively reduce the cost of spare parts. At the same time, the powerful electronic release design can meet various protection requirements. All electronic releases are equipped with liquid crystal display as standard, and have menu modes in Chinese and English. International and standardized production processes ensure that the quality of products Higher level.

Model Description of Siemens 3WT Circuit Breaker

◆The circuit breaker selection label (with terminal number) is shown in the figure below.

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◆The circuit breaker type label is shown in the figure below.

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Siemens 3WT circuit breaker structure description

◆The overall structure design of the circuit breaker is shown in the figure below.

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Note: 1. Arc extinguishing chamber; 2. Type selection label; 3. Carrying handle; 4. Counting indicator;

5. Type label; 6. Energy storage indicator; 7. Shake in and out icon; 8. Ready to close indicator;

9. Energy storage handle; 10. Circuit breaker feet; 11. Raking mechanism drive shaft; 12. Withdrawal window;

13. Position indicator; 14. CASTELL lock; 15. Overcurrent release (ETU);

16. "Mechanical opening" button; 17. "Mechanical closing" button; 18. Circuit breaker closing and opening indicator;

19. Reset button; 20. Front panel; 21. Auxiliary contact slot.

◆The design of the circuit breaker guide frame is shown in the figure below.

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Note: 1. Hook hole; 2. Hook label; 3. Guide frame type label; 4. Safety baffle (optional);

5. Grounding terminal; 6. Door interlock (optional); 7. Coding screw; 8. Rail locking device;

9. Guide rail; 10. Bridge contact; 11. Safety shutter locking device; 12. Safety shutter driver (optional);

13. Position signal switch (optional); 14. Crank hand; 15. Auxiliary circuit connector.

◆The design of the circuit breaker indicator status is shown below.

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Features of Siemens 3WT circuit breaker

◆Safe and reliable

1. The cabinet door adopts a sealed frame to improve the protection level, so that the circuit breaker can be operated completely on site;

2. The line can enter from the top or bottom of the equipment;

3. Withdrawable Siemens circuit breakers can be locked with standard locks to prevent accidental movement of the equipment;

4. After the circuit breaker body is taken out, the guide frame can be locked with a standard lock;

5. The signal switch after overload and short circuit trip, with mechanical closing and locking device;

6. High protection level, IP55 with cover plate;

7. As a standard configuration, mechanical closing and locking device after overload or short circuit trip;

8. The circuit breaker is equipped with auxiliary circuit wiring terminals that meet the required number.

◆Easy to operate

1. Clear "ON-OFF" indicator with auxiliary signal contacts;

2. It is equipped with a ready-to-close indicator with signal contacts as standard.

◆Modular design

1. Many components, such as auxiliary trip unit, electric operating mechanism, electronic trip unit and current transformer, can be replaced or modified to ensure that the circuit breaker is suitable for changing needs.

◆Low power consumption

1. The low power consumption design of electrical components can effectively reduce its own power loss and reduce the cost of control transformers;

2. Siemens circuit breaker 3WT is suitable for installation in a narrow space with poor ventilation. Siemens 3WT circuit breaker size description

◆Fixed circuit breaker, frame size I, 3 poles and 4 poles

Horizontal connection size chart

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Note: 1. The fixed point 4xM8 is pressed into the nut; 2. The center line of the operation panel; 3. Auxiliary wire connection system;

3. Take out the space required for the arc extinguishing chamber; 5. Space required for the auxiliary circuit connector;

6. The space required above the arc extinguishing chamber; 7. Switch cabinet doors; 8. Carry handles;

9. Slot (4mm deep), used to install phase spacer; 10. Communication module (optional).

Vertical connection size chart

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Front connection size chart

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◆Safe distance

There is no need to leave an extra safety distance between adjacent grounding elements above the Siemens circuit breaker (marked as "⑥" on the fixed circuit breaker). The distance between the connection point and the busbar support shall not exceed 250mm.

When the rated working voltage does not exceed 440V AC, if the busbar system is not above the circuit breaker, there is no need to protect the vertical busbar (for example, using a front connection).

On the other hand, if the voltage exceeds 440V AC, the live bare conductors and busbars (if installed above Siemens 3WT circuit breakers and supply current from above) must be protected by phase spacers, busbar covers or arc extinguishing chamber covers. To prevent arcing (such accessories are only used for horizontal or vertical connection).

If electrical equipment has been installed directly above the circuit breaker (if the arc extinguishing chamber is not used) or next to the circuit breaker, it should be protected by a protective cover. If an additional phase spacer or protective cover has been installed, it must be ensured that the heat dissipation of the Siemens circuit breaker is not hindered.

◆Withdrawable circuit breaker, frame size I, 3 poles and 4 poles

Horizontal connection size chart

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Note: 1. The guide frame mounting hole 4xφ9; 2. The center line of the operation panel; 3. Auxiliary wire connection system;

4. Guide frame; 5. Switch cabinet door; 6. Disconnect position; 7. Test position; 8. Connect position;

9. Slot (6mm deep), used to install phase spacer; 10. Communication module (optional).

Vertical connection size chart

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Front connection size chart

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The above is the Siemens 3WT circuit breaker manual, I hope it can help everyone. okplazas.com Motor Mall is a professional sales agent for Siemens products. Welcome to e-mail: [email protected] for consultation, and you can also contact wechat:+86- 13689242098 online for product consultation!