Siemens Fuse disconnector switch, 3-pole, size 2, 125A Part number 3KF2312-2LF11

Product Overview

The Siemens SENTRON 6KF2312-2LF11 is a 3-pole switch-disconnector with integrated fuse capacity, rated for 125 A, size 2. Designed for front-mounted operation with a direct-acting grey handle mechanism, it is suited for robust industrial low-voltage applications requiring combined switching and protection in one unit.

Key Features

• 3-pole switch-disconnector with fuses (size 2) for three-phase equipment protection
• Rated current: 125 A with compatible LV HRC fuses (size 000 and 00)
• Front-acting direct handle (grey) for easy operation and visual indication
• Fuse-system: LV HRC fuses, enabling high breaking capacity and clear fault isolation
• Durable mechanical and electrical performance: ~12,000 switching cycles typical, rated switching loads up to 110 kW at 690 V AC

Technical Specifications

• Product Series: Siemens SENTRON 3KF Switch Disconnectors with Fuses
• Article Number: 6KF2312-2LF11
• Number of Poles: 3
• Rated Current (Iu): 125 A
• Rated Operational Voltage (Ue): Up to 690 V AC (50/60 Hz)
• Rated Insulation Voltage (Ui): 1000 V
• Rated Switching Power: Up to 110 kW at 690 V AC, 75 kW at 500 V AC
• Short-Circuit Current Making Capacity (Icm): 7.65 kA at 690 V AC (without fuse link)
• Size of Fuse Link: NH000 / NH00 (size 000 and 00)
• Mechanical Service Life: ~12,000 operations typical
• Electrical Endurance (AC-23 A): 8,000 cycles at 440 V, 5,000 cycles at 690 V; DC-23 A: 1,000 cycles at 440 V
• Fuse Let-through Current (I²t): Max allowed eg. 223,000 A²·s at 500 V, 360,000 A²·s at 690 V
• Dimensions (H × W × D): 150 mm × 190 mm × 206.5 mm
• Installation Depth: 206.5 mm
• Net Weight (Approx.): 2.5 kg
• Protection Class: IP20 when covered; front protection IP00
• Mounting / Conductor Connection: Top and bottom for main circuit; flat connector or lugs for copper/aluminium conductors
• Conductor Cross-Section Range: Copper: 2.5-95 mm² (1×) or 2× (2.5-50 mm²); Aluminium similar
• Tightening Torque (Screw Terminals): 15-22 N·m

Compliance & Certifications

• Designed in accordance with IEC/EN standards for switch-disconnectors with fuse combinations (IEC 60947-3, IEC 60947-2)
• Overvoltage category IV and surge voltage resistance rated at 12 kV
• Sealable handle mechanism for safe isolation in maintenance mode
• Suitable for industrial and infrastructure installations requiring high safety and switching performance

Applications

The 6KF2312-2LF11 is ideal for installation in low-voltage switchgear, motor feeder panels, electrical distribution boards and industrial control centres where combined disconnection and fusible protection is required. Its robust build, high current rating and fuse link compatibility make it suited for heavy-duty applications in manufacturing plants, utilities and infrastructure systems.