The Siemens 3LD2704-0TK51 Switch Disconnector is a high-performance main control switch designed for safe isolation, power switching, and industrial control applications. As part of the trusted Siemens SENTRON 3LD2 Series, this switch disconnector delivers dependable electrical performance, robust construction, and long operational life, making it an ideal choice for industrial control panels, motor control centers, OEM machinery, and power distribution systems.
Engineered to meet the demanding requirements of modern industrial installations, the 3LD2704-0TK51 is a 3-pole switch disconnector rated at 100A with an operating power rating of 37 kW at AC-23A, 400V. It is specifically designed as a main switch and switch disconnector, providing reliable circuit isolation and operational safety for industrial electrical systems.
One of the key advantages of the Siemens 3LD2704-0TK51 is its robust front-mounted rotary operating mechanism. The switch features a black rotary handle with 4-hole mounting, allowing operators to perform switching operations safely and efficiently. The manual position indicator clearly displays 1 (ON) and 0 (OFF) positions, improving operational visibility and reducing the risk of switching errors.
The 3LD2704-0TK51 Switch Disconnector is designed with a rated insulation voltage of 690V AC and a surge voltage resistance of 6kV, enabling reliable operation in demanding industrial environments. Its ability to handle high electrical loads makes it suitable for motor switching, machine isolation, and power distribution applications across a wide range of industries.
A major benefit of the Siemens SENTRON 3LD2 Series is its outstanding durability. The 3LD2704-0TK51 offers a mechanical service life of approximately 100,000 operating cycles, ensuring long-term reliability even under frequent switching conditions. This durability helps reduce maintenance requirements and supports continuous plant operation.
The switch is equipped with IP65 front protection, providing excellent resistance against dust, moisture, and harsh industrial conditions. Siemens also specifies compliance with NEMA 1, 3R, 4X, and 12 protection classifications, making the switch suitable for installation in challenging industrial and commercial environments.
Another significant advantage of the 3LD2704-0TK51 is its suitability for multiple industrial functions. Siemens officially identifies the product as suitable for:
The switch can also be locked in the OFF position, supporting lockout/tagout (LOTO) procedures and improving workplace safety during maintenance activities.
The Siemens 3LD2704-0TK51 provides excellent short-circuit performance with a short-time withstand current of 2,000A for 1 second and a conditional short-circuit current of 50kA when protected by a suitable gG fuse. These characteristics help ensure safe operation under fault conditions and contribute to overall system reliability.
At SB Smart (SBSmart.in), we supply genuine Siemens electrical and industrial automation products sourced through trusted channels. The Siemens 3LD2704-0TK51 Switch Disconnector ensures authentic Siemens quality, reliable operation, and long-term performance for critical industrial applications.
Whether you are building a new electrical control panel, upgrading a power distribution system, or implementing a dependable isolation solution, the Siemens 3LD2704-0TK51 delivers the safety, durability, and operational confidence expected from Siemens SENTRON products.
| Specification | Details |
|---|---|
| Product Name | Main Control Switch / Switch Disconnector |
| Part Number | 3LD2704-0TK51 |
| SKU | 3LD2704-0TK51 |
| Brand | Siemens |
| Product Family | SENTRON 3LD2 |
| Product Type | Switch Disconnector |
| Number of Poles | 3 Pole |
| Rated Current (Iu) | 100 A |
| Rated Operational Voltage | 690 V AC |
| Operating Frequency | 50/60 Hz |
| Operating Power AC-23A at 400V | 37 kW |
| Operating Power AC-23A at 690V | 30 kW |
| Operating Power AC-3 at 400V | 30 kW |
| Operating Power AC-3 at 690V | 22 kW |
| Mounting Type | Front Mounted |
| Handle Type | Black Rotary Operating Mechanism |
| Switch Position | 1 ON – 0 OFF |
| Protection Rating | IP65 Front |
| NEMA Rating | 1, 3R, 4X, 12 |
| Insulation Voltage (Ui) | 690 V |
| Surge Voltage Resistance | 6 kV |
| Short-Time Withstand Current (Icw) | 2,000 A / 1 sec |
| Mechanical Life | 100,000 Operations |
| Lockable in OFF Position | Yes |
| Application | Main Switch, Safety Switch & Isolation |
| Weight | Approx. 0.49 kg |
| Manufacturer | Siemens |
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