Siemens Load disconnector 3LD3, 3-pole, 25A main switch Part number 3LD3140-0TK11

Product Overview

The Siemens SIRIUS 3LD3 main switch/disconnector (SKU: 3LD3140-0TK11) is a 3-pole fixed mounting unit designed for panel and floor-mounted installations with door coupling. Rated for 25 A operational current, this device provides robust switching and isolation functionality ideal for industrial applications.

Key Features

• 3-pole main switch/disconnector for SIRIUS system with 25 A rating
• Rated operating power at AC-23 A: up to 10 kW at 400 V, 9 kW at 440 / 690 V
• Fixed mounting with door coupling and central hole mounting (22.5 mm toggle drive, 48×48 mm front cutout)
• High insulation voltage rating (690 V) and surge voltage resistance of 6 kV
• Designed for harsh environments: protection class IP65 (front) and NEMA rating 1, 3R, 4X, 12
• Lockable in OFF position to support safe maintenance
• Conditional short-circuit current rating: up to 10 kA at 440 V for gG fuse protection

Technical Specifications

• Product Type: Main switch/disconnector, SIRIUS 3LD3 series
• Article Number: 3LD3140-0TK11
• Number of Poles: 3
• Operational Current (Iₙ): 25 A (AC-21)
• Rated Operating Power: AC-23 A: 4 kW @ 240 V; 10 kW @ 400 V; 9 kW @ 440/690 V
• Insulation Voltage (Uᵢ): 690 V
• Surge Voltage Resistance: 6 kV
• Short-Circuit Current (Conditional): Up to 10 kA @ 440 V with gG fuse; I²t max 4 kA²·s
• Lockable OFF Position: Yes (hasp thickness 4-6 mm)
• Dimensions (H × W × D): 60 mm × 36 mm × 380 mm
• Net Weight (approx.): 0.30 kg
• Mechanical Service Life (typ.): 100,000 cycles
• Electrical Endurance (typ., AC-23 A 690 V): 6,000 cycles

Compliance & Certifications

• CE-marking
• RoHS compliant
• Designed for NEMA 1, 3R, 4X, 12 enclosures

Applications

Ideal for use as a main switch or disconnector in low-voltage switchgear and control panels. Suitable for industrial environments requiring a reliable means of isolation and switching, including floor-mounted or panel-door installations with built-in security via lockable OFF position.