Siemens Switch disconnector, main switch, 3-pole, black, 125A Part number 3LD2804-0TK51

Product Overview

The Siemens 3LD2804-0TK51 is a SENTRON 3LD-series 3-pole switch disconnector / main switch designed for safe disconnection, load switching and maintenance isolation in industrial and commercial electrical installations. It supports high current (125 A) and high operating voltage (up to 690 V AC), making it suitable for use as a main switch or disconnect switch in power distribution boards, motor control centers, and heavy-load circuits.

Key Features

• 3-pole main switch / switch disconnector
• Rated operational current: 125 A (AC-21 service) / 80 A (AC-23 load-switching)
• Rated operational voltage up to 690 V AC
• Front-mount rotary handle (short rotary knob), 4-hole mounting
• High power switching capability: up to 45 kW at 400 V (AC-23 load-switching)
• Protection class IP65 on front — suitable for panel/front-mounted installations in harsh environments
• Can be locked in OFF position (padlockable) for maintenance / safety use
• Fixed-mount design for robust and secure installation

Technical Specifications

• Article Number: 3LD2804-0TK51
• Product Family: SENTRON 3LD switch disconnectors / main switches
• Number of Poles: 3
• Rated Operational Current (AC-21): 125 A
• Rated Load-Switching Current (AC-23) at 400 V: 80 A
• Rated Operational Voltage (Ue): up to 690 V AC
• Rated Insulation Voltage (Ui): 690 V AC
• Surge Voltage Withstand (Uimp): 6 kV
• Switching Capacity / Power Ratings:
  • AC-23 / 400 V: 45 kW
  • AC-23 / 690 V: 37 kW
  • AC-3 / 400 V: 37 kW
  • AC-3 / 690 V: 30 kW
• Protection Class (Front): IP65
• Mounting Type: Front-mount with 4-hole attachment (fixed-mount)
• Actuator: Short rotary knob (black), manual ON/OFF
• Mechanical Endurance: ~100 000 switching cycles
• Electrical Endurance (AC-23 / 400 V): 6 000 cycles
• Operating Frequency: 50/60 Hz
• Ambient Operating Temperature: –25 °C … +55 °C
• Net Weight (approx.): 0.488 kg

Compliance & Certifications

• Designed for use as main switch, switch disconnector, maintenance/repair switch or safety switch
• Padlockable OFF position for maintenance safety
• Surge voltage and insulation ratings compliant with industrial low-voltage standards
• Front protection IP65 ensures suitability for panel-mounted applications, even in harsh or dusty environments

Applications

This switch disconnector is ideal as a main isolator or maintenance switch in power distribution boards, motor control centers, and industrial switchgear panels. Typical uses include isolation of entire circuits or machines for maintenance, safe switching of heavy loads, load-side disconnection for motors or equipment, and secure control panels where a lockable, front-mounted isolator is required. Its high current, high voltage, and IP65 front rating make it suitable for industrial, commercial and demanding environments.