siemens
Siemens SIRIUS 3LD Main Switch Disconnector
Model: 3LD2103-0TK51
4-hour response · Pricing in SAR · Delivery across all KSA regions
3LD2103-0TK51 — Siemens SIRIUS 3LD Main Switch Disconnector
The Siemens SIRIUS 3LD is a rotary main switch-disconnector engineered for safe isolation of machinery and electrical equipment under IEC 60947-3 and IEC 60204-1. Covering 12 A to 160 A at up to 690 V AC in 2-pole, 3-pole, and 4-pole configurations, the 3LD is operated through the panel door via a rotary shaft and handle — keeping the operator outside the live panel during switching. The padlockable OFF position accommodates up to three padlocks simultaneously, satisfying LOTO procedures required by Saudi industrial safety regulations for machinery maintenance.
The 3LD's positive-opening contacts meet IEC 60947-5-1 Annex K requirements, ensuring mechanical forcing of the open position when the handle is rotated regardless of contact welding — the fundamental property distinguishing a certified isolator from an ordinary switch. Auxiliary contact modules (1 NO + 1 NC) integrate isolator status into machine interlocking circuits. Emergency stop function versions (3LD5) with yellow/red handle satisfy IEC 60204-1 Category 0 stop requirements where the main isolator doubles as emergency stop.
In Saudi Arabia, the SIRIUS 3LD KSA is the industry-standard machine isolator for IEC 60204-1 compliant panels — mandatory on every machine sold to industrial facilities, government projects, and Aramco/SABIC vendor-approved installations. Saudi SASO standard SASO 2728 (equivalent to IEC 60204-1) mandates isolation for every machine connected to a power supply, and the 3LD satisfies this requirement in the most practical panel layout. Panel builders across Riyadh, Jeddah, and Dammam specify the 3LD for its compliance credentials, wide current range, and robust through-door handle mechanism withstanding frequent operation cycles.
Razz Middle East stocks 3LD isolators in all current ratings and pole configurations with same-day dispatch for common sizes and 4-hour RFQ response for special configurations.
Technical Specifications
Full specifications for the 3LD2103-0TK51
- Current Range
- 12–160 A (AC-23A)
- Voltage
- Up to 690 V AC
- Poles
- 2P, 3P, 4P
- Handle
- Through-door rotary (shaft extension up to 300 mm)
- Padlock
- Up to 3 padlocks in OFF
- Contacts
- Positive-opening (IEC 60947-5-1 Annex K)
- Aux Contacts
- 1 NO + 1 NC add-on module
- Emergency Stop
- 3LD5 yellow/red handle version
- IP Rating
- IP65 front face
- Compliance
- IEC 60947-3, IEC 60204-1, SASO 2728
Key Features & Benefits
- IEC 60947-5-1 Annex K positive-opening contacts mechanically force the switch open regardless of contact welding — the fundamental safety property that distinguishes a certified isolator from an ordinary switch for LOTO procedures.
- Through-door rotary handle with up to 300 mm shaft extension allows the 3LD to be mounted behind busbars in deep panels while keeping the operator outside the live panel enclosure during switching.
- Three-padlock capacity in OFF position satisfies multi-trade LOTO procedures where electrical, mechanical, and instrumentation teams must each apply personal locks during isolation for maintenance.
- 2P, 3P, and 4P pole configurations cover single-phase, three-phase, and three-phase with neutral machinery supplies across the full range of Saudi panel builder projects.
- Emergency stop variant (3LD5) with yellow/red handle satisfies IEC 60204-1 Category 0 stop for machines where the main isolator also serves as emergency stop, reducing panel BOM by one device.
- Add-on auxiliary contact module (1 NO + 1 NC) prevents machine start commands while the isolator is in OFF or intermediate position — a critical safety interlock function for Saudi Aramco approved machinery.
- IP65 front-face protection withstands panel door wash-down in food processing and pharmaceutical machinery environments requiring hygienic panel surfaces.
Industrial Applications in Saudi Arabia
- Main machine isolator on every control panel sold to Saudi industrial facilities under SASO 2728 / IEC 60204-1, covering OEM machines from conveyors and pumps to packaging and processing machinery.
- LOTO isolation point at SABIC and Aramco machinery, where three-padlock capacity allows simultaneous isolation by electrical, mechanical, and instrument teams under the facility LOTO programme.
- MCC individual motor feeder isolator, where through-door handle allows safe switching from the MCC front without opening adjacent live compartments.
- HVAC equipment main isolator for AHUs, cooling towers, and FCUs in commercial buildings, providing maintenance isolation compliant with MEW electrical inspection requirements.
- Pump station main supply isolator for NWC and Marafiq remote facilities, where padlockable OFF prevents accidental re-energisation during mechanical maintenance.
- Machine tool main isolator for CNC centres at Vision 2030 manufacturing facilities, meeting positive-opening contact requirements of the machinery guarding safety standards.
- Emergency stop function isolator (3LD5) for conveyor main panels at Saudi food manufacturers, combining isolation and emergency stop in a single door-mounted device.
Industrial Supplier in Saudi Arabia
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Frequently Asked Questions — 3LD2103-0TK51
Common questions from buyers in Saudi Arabia and the GCC