The Siemens 3LD2003-0TK51 is a SENTRON 3LD2 three-pole main control switch / switch disconnector designed for manual switching and electrical isolation in industrial electrical installations. Siemens specifies a 16 A uninterrupted current rating and an operational power of 7.5 kW at AC-23A, 400 V.
This model features a front-mounted rotary operating mechanism with a black handle and four-hole handle mounting. It is suitable for industrial machinery, control panels, electrical equipment and maintenance isolation applications where reliable manual switching is required.
Important: The supplied product title mentions “Auxiliary switch (1NO+1NC)”, but 3LD2003-0TK51 itself is the basic/main switch and does not contain auxiliary contacts. Siemens lists a separate 1NO + 1NC standard-version variant, 3LD2003-1TP51, for this configuration.
The Siemens 3LD2003-0TK51 can be used for:
The Siemens 3LD2003-0TK51 provides a compact and dependable solution for manually switching and isolating electrical equipment. Its rotary operating mechanism allows straightforward ON/OFF operation, while the front-mounted construction makes it suitable for integration into control panels and machine enclosures.
The switch is rated for 16 A and can provide up to 7.5 kW at AC-23A, 400 V. Siemens data also specifies AC-3 operating capabilities for suitable motor-related applications, including 6 kW at 400 V, subject to the applicable conditions and ratings.
For applications requiring auxiliary status or switching feedback, the appropriate auxiliary-contact configuration should be selected separately. Siemens documentation identifies 3LD2003-1TP51 as the corresponding standard version with 1 NO + 1 NC auxiliary contacts.
Always verify the exact part number, accessory compatibility, electrical rating and installation requirements before ordering or installing the device.
SB Smart supplies Siemens industrial electrical products across Faridabad, Delhi NCR, Noida, Gurgaon/Gurugram, Ghaziabad, Mumbai, Pune, Ahmedabad, Hyderabad, Bengaluru/Bangalore, Chennai, Jaipur, Chandigarh, Ludhiana, Kolkata and other major industrial locations across India.
The Siemens 3LD2003-0TK51 can be considered by panel builders, OEMs, machine manufacturers, electrical contractors, system integrators and industrial maintenance teams.
1. What is Siemens 3LD2003-0TK51?
It is a Siemens SENTRON 3LD2 three-pole main control switch/switch disconnector with a 16 A uninterrupted current rating.
2. Is 3LD2003-0TK51 an auxiliary switch?
No. 3LD2003-0TK51 is the basic/main switch and has no built-in auxiliary contacts. Siemens lists 3LD2003-1TP51 as the standard 1NO + 1NC version.
3. What is the current rating of 3LD2003-0TK51?
The uninterrupted current rating is 16 A.
4. What is its operational power at 400 V?
The AC-23A operational power is 7.5 kW at 400 V.
5. What type of mounting does it use?
It is a front-mounted switch with a four-hole handle mounting arrangement.
6. Where can it be used?
It is suitable for main switching, switch-disconnector, safety-switch and maintenance/repair applications, subject to the appropriate electrical and installation requirements
| 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 |
No reviews yet.