Siemens Switch disconnector, 4-pole, 1NC + 1NO, 9.5kW, 25A Part number 3LD2154-2EP53

Product Overview

The Siemens 3LD2154-2EP53 is a 4-pole switch-disconnector from the SENTRON 3LD family, designed for panel mounting as a mains isolator, emergency-stop or maintenance switch. It features a rotary red/yellow handle for manual ON/OFF control, supports up to 25 A operational current, and is rated for 9.5 kW at 400 V (AC-23 A), making it suitable for controlling and isolating mains power for machinery or control circuits. The front-mounted, IP65-rated enclosure allows use even in demanding industrial or outdoor environments, with lockable OFF position and reliable switching performance.

Key Features

• SENTRON 3LD series 4-pole switch-disconnector / isolator
• Operational current: 25 A; switching capacity: up to 9.5 kW at 400 V (AC-23 A)
• Suitable for use as main switch, maintenance disconnector, emergency-stop or general power isolator
• Rotary operate mechanism with red/yellow handle — clearly visible emergency-stop style actuation
• Front-mount design with 22.5 mm center-hole handle installation — suitable for control-panel or door mounting
• Lockable OFF position — can be secured with padlock to prevent unauthorized reactivation
• 4-pole configuration — supports switching of all phases plus neutral / ground as required
• Protection class: IP65 (front) — dust tight and water-jet protected, suitable for industrial or outdoor use
• Electrical insulation rating: 690 V; surge-voltage resistance: 6 kV — robust for industrial mains switching
• Mechanical endurance: typically 100,000 operations; electrical durability supports frequent switching cycles

Technical Specifications

• Article Number: 3LD2154-2EP53
• Product Type: 4-pole switch-disconnector / isolator
• Operational Current (AC): 25 A (at 40–55 °C ambient)
• Switching Capacity (AC-23 A, 400 V): 9.5 kW
• Rated Insulation Voltage: 690 V
• Surge Voltage Withstand: 6 kV
• Poles: 4 (all-pole switching including neutral/ground)
• Mounting Type: Front-mount, panel / door installation via 22.5 mm center hole
• Handle / Actuator: Rotary knob — red/yellow, ON-OFF control, visible position indicator
• Lockable OFF Position: Yes (with padlock, hasp thickness 4–8 mm)
• Protection Class: IP65 (front), suitable for harsh / outdoor / industrial environments
• Mechanical Durability: approx. 100,000 switching cycles
• Rated Use Cases: Main switch, isolation switch, emergency-stop switch, maintenance disconnector

Compliance & Standards

• Part of the Siemens SENTRON 3LD switch-disconnector family — industrial-grade low-voltage switching solution
• Adheres to IEC/EN standards for manual load disconnecting devices and isolators under low-voltage switchgear regulations
• Suitable for use in control panels, distribution boxes, machinery enclosures or outdoor electrical cabinets (IP65 protection)

Applications

The 3LD2154-2EP53 is ideal as a main power isolator, emergency-stop switch, or maintenance disconnector for industrial machines, control panels, motor feeders, HVAC systems, or any installation needing safe disconnection of all supply phases including neutral. Its robust IP65 enclosure makes it suitable for indoor and outdoor environments, while the lockable OFF position and visible handle provide safety and compliance for maintenance, repair, or emergency-shutdown procedures.