The Siemens 3LD2003-0TK51 Switch Disconnector is a high-performance industrial switching device designed to provide safe electrical isolation, reliable circuit control, and dependable power switching in industrial environments. As part of the globally recognized Siemens SENTRON 3LD2 Series, this switch disconnector is engineered to meet the requirements of modern electrical systems, control panels, machinery installations, motor control centers, and power distribution networks. With its compact design, robust construction, and proven Siemens reliability, the 3LD2003-0TK51 is an ideal solution for applications requiring secure isolation and long-term operational performance.
The Siemens 3LD2003-0TK51 is a 3-pole main switch disconnector with a rated operational current of 16A and an operating power rating of 7.5 kW at AC-23A, 400V. Designed for front mounting, the switch features a rotary operating mechanism with a black actuator handle, enabling safe and convenient operation while providing clear indication of switch status. Siemens classifies this model as a main switch, switch disconnector, safety switch, and maintenance/repair switch, making it suitable for a wide range of industrial applications.
One of the primary advantages of the 3LD2003-0TK51 Switch Disconnector is its versatility. It can be used as:
This flexibility allows electrical engineers, panel builders, and industrial automation professionals to standardize switching and isolation solutions across multiple installations.
The switch incorporates a front-mounted rotary operating mechanism with clearly marked 0 (OFF) and 1 (ON) positions. The ergonomic black rotary handle allows operators to quickly identify circuit status and perform switching operations safely and efficiently. The compact front-mount design also simplifies integration into control panels and switchboards where space optimization is important.
A major benefit of the Siemens 3LD2003-0TK51 is its superior environmental protection. The switch offers IP65 protection from the front, providing excellent resistance against dust ingress and water exposure. This high protection level makes the device suitable for demanding industrial environments such as manufacturing facilities, process plants, utility infrastructure projects, OEM machinery, and automation systems.
The 3LD2003-0TK51 is engineered for long service life and dependable operation. Siemens specifies a mechanical endurance of approximately 100,000 operating cycles and electrical endurance of 6,000 switching cycles at AC-23A, 690V, helping reduce maintenance requirements and ensuring reliable performance throughout the product lifecycle.
Safety remains a key feature of the SENTRON 3LD2 range. The switch can be locked in the OFF position and supports up to three padlocks for lockout/tagout (LOTO) procedures. This functionality helps maintenance personnel safely isolate equipment before servicing and significantly reduces the risk of accidental energization.
The switch is designed for operation at voltages up to 690V AC and offers excellent electrical performance for industrial control and power distribution systems. Whether installed in motor control centers, machine control panels, or facility-wide distribution systems, the Siemens 3LD2003-0TK51 delivers reliable switching performance and safe isolation capabilities.
At SB Smart (SBSmart.in), we supply genuine Siemens electrical and industrial automation products that meet the highest standards of quality, safety, and reliability. The Siemens 3LD2003-0TK51 Switch Disconnector offers authentic Siemens engineering, dependable operation, and long-term performance for mission-critical industrial applications.
Whether you are designing a new control panel, upgrading an existing electrical system, or implementing a reliable isolation solution, the Siemens 3LD2003-0TK51 provides the durability, safety, and operational confidence expected from Siemens SENTRON products.
| Specification | Details |
|---|---|
| Product Name | Switch Disconnector Main Switch |
| Part Number | 3LD2003-0TK51 |
| SKU | 3LD2003-0TK51 |
| Brand | Siemens |
| Product Family | SENTRON 3LD2 |
| Product Type | Switch Disconnector |
| Function | Main Switch |
| Number of Poles | 3 Pole |
| Rated Current (Iu) | 16 A |
| Operating Power AC-23A at 400V | 7.5 kW |
| Rated Operational Voltage (Ue) | 690 V AC |
| Insulation Voltage (Ui) | 690 V |
| Mounting Type | Front Mounted |
| Operating Mechanism | Rotary Operating Mechanism |
| Handle Type | Black Rotary Handle |
| Switch Positions | 0 – OFF / 1 – ON |
| Protection Rating | IP65 (Front) |
| Face Dimensions | 67 × 67 mm |
| Mounting Hole Diameter | Ø5 mm |
| Operating Temperature | -25°C to +55°C |
| Mechanical Life | Up to 100,000 Operations |
| Electrical Endurance | 6,000 Operations |
| Lockable in OFF Position | Yes |
| Maximum Padlocks | 3 |
| Connection Type | Box Terminal |
| Application | Main Switching, Safety Isolation & Maintenance |
| Standards Compliance | IEC 60947-3 |
| Manufacturer | Siemens |
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