Siemens Sentron Switch disconnector, main switch, 1NC+1NO, 3-pole Part number 3LD2164-1GP51

Product Overview

The 3LD2164-1GP51 is a 3-pole switch-disconnector (isolator / main switch) from the Siemens SENTRON 3LD family. It serves as a compact main switch or isolator for industrial and commercial electrical installations, providing a reliable means to manually disconnect circuits for maintenance, safety, or control. With a 25 A rating and solid mechanical design, it’s suitable for controlling and isolating loads up to moderate power levels.

Key Features

• 3-pole switch-disconnector / isolator for AC circuits
• Rated operational current: 25 A (AC-21 / AC-22); suitable for loads up to approx. 9.5 kW at 400 V (AC-23 A rating)
• Rotary handle operation for clear ON / OFF switching (manual control)
• Compact molded-plastic enclosure with metric screw connections — ideal for cabinet or panel installation
• Auxiliary contacts: 1 NO + 1 NC — enable signalling or interlocking when needed
• High insulation and surge withstand: rated insulation 690 V, surge resistance 6 kV — appropriate for industrial environments
• Protection class: IP65 (when front-mounted) — suitable for enclosure or external-door mounting in industrial settings
• Mechanical and electrical robustness: typical 100,000 mechanical operations; rated for repeated switching
• Configurable for lock-off (padlocking) in OFF position — enhances safety during maintenance

Technical Specifications

• Article Number: 3LD2164-1GP51
• Type: 3-pole Switch-Disconnector / Isolator
• Rated Operational Current: 25 A (AC-21 / AC-22); 20 A at AC-23 A under certain load conditions
• Rated Operating Power: Up to ~9.5 kW at 400 V AC (depending on load type and load category)
• Auxiliary Contacts: 1 NO + 1 NC, rated 10 A / 500 V AC
• Insulation Voltage: 690 V
• Surge Voltage Withstand: 6 kV
• Protection Class: IP65 (front, when door/cabinet mounted)
• Mechanical Lifespan: ~100,000 switching cycles
• Electrical Endurance: Rated for AC-23 A switching at 690 V
• Mounting: Enclosure or panel mounting — fixed installation
• Ambient Operating Temperature Range: –25 °C to +55 °C
• Lock-off Capable: Yes — can be locked in OFF position for safety / maintenance
• Connection Type: Screw-type terminations for main and auxiliary circuits

Applications

The 3LD2164-1GP51 is suitable as a main switch or isolator for motor control circuits, distribution panels, branch circuits, or general electrical installations where a reliable manual disconnection point is required. Typical uses include machinery isolation, maintenance safety, control panels, switchboards, small to medium load circuits, and industrial or commercial installations requiring a durable, lockable isolator with auxiliary contact options.