Siemens Sentron Isolator switch, 4-pole, 25A maximum current
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Siemens

Siemens Sentron Isolator switch, 4-pole, 25A maximum current Part number 3LD2103-1TL51

EAN / Barcode 4011209402928
Product Type Control Panel
Product Class Switch disconnector (low voltage)
ETIM Class Switch disconnector (low voltage)
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Product Description

Product Overview

The Siemens 3LD2103-1TL51 is a SENTRON switch-disconnector, 4-pole main switch designed for front-panel mounting. It offers a rated operational current of 25 A and is capable of power switching up to 9.5 kW at 400 V under AC-23A conditions. It features a rotary black knob actuator and can be locked in the OFF position for safety.

Key Features

  • 4-pole switch-disconnector with main-switch functionality
  • Rated current of 25 A for AC-21/AC-23 applications
  • Rated switching power of up to 9.5 kW at 400 V AC under AC-23A category
  • Front-panel mounting design with 4-hole fixation and rotary actuation
  • Compact footprint for control panels: height 84 mm, width 67 mm, depth 92.5 mm
  • Operating temperature range from –25 °C to +55 °C; suitable for enclosure installations
  • High protection class: IP65 on the front; can be locked in the OFF position

Technical Specifications

  • Product Series: SENTRON 3LD
  • Article Number: 3LD2103-1TL51
  • Rated Operational Current (Iu): 25 A
  • Rated Switching Power (AC-23A, 400 V): 9.5 kW
  • Poles: 4
  • Mounting Type: Front-panel mounting, 4-hole fixation
  • Actuator: Short rotary knob, black
  • Insulation Voltage (Ui): 690 V
  • Surge Voltage Resistance: 6 kV
  • Protection Class (front): IP65
  • Ambient Operating Temperature: –25 °C … +55 °C
  • Dimensions (H × W × D): 84 mm × 67 mm × 92.5 mm

Compliance & Certifications

  • Designed in accordance with IEC/EN switch-disconnector standards and top Siemens industrial requirements
  • Lockable OFF position meets safety maintenance and service-isolation criteria
  • High protection class and suitability for demanding industrial environments

Applications

Ideal for installation in industrial control-panels and distribution systems where a reliable 4-pole main switch/disconnector is needed. Commonly used in control cabinets, machine-tool setups, switchgear assemblies and applications requiring safe isolation of multi-phase loads in industrial and manufacturing facilities.

Technical Specifications

Colour control elementBlack
Degree of protection (IP), front sideIP65
Degree of protection (NEMA)Other
Depth93 mm
Device constructionBuilt-in device fixed built-in technique
Height84 mm
InterlockableYes
Max. rated operation voltage Ue AC690 V
Number of poles4
Number of switches1
Rated operation power at AC-23, 400 V10 kW
Rated operation power at AC-3, 400 V8 kW
Rated permanent current at AC-21, 400 V25 A
Rated permanent current at AC-23, 400 V20 A
Rated permanent current Iu25 A
Rated short-time withstand current lcw0.64 kA
Suitable for front mounting 4-holeYes
Type of control elementShort thumb-grip
Type of electrical connection of main circuitFrame clamp
Version as main switchYes
Version as maintenance-/service switchYes
Version as safety switchYes
Width67 mm
Width in number of modular spacings4
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