Siemens Cable-operated switch, metal enclosure, 2x M20 x1.5, 2NC Part number 3SE7120-1BF00

Product Overview

The Siemens 3SE7120-1BF00 cable-operated switch features a metal enclosure with two M20 x 1.5 cable entries and is equipped with 2NC contacts, a latching mechanism compliant with EN ISO 13850, and a blue pushbutton release. Designed for wire lengths up to 5 meters, this robust safety device provides reliable emergency-stop functionality along conveyors and machinery where long-distance cable actuation is required. Its durable metal body combined with the clearly identifiable blue reset button ensures high visibility and dependable performance in industrial environments.

Key Features

• Cable-operated emergency-stop switch from the Siemens SIRIUS 3SE7 series
• Metal enclosure for enhanced mechanical strength
• Two M20 × 1.5 cable entries for flexible installation
• 2 normally-closed (2NC) auxiliary safety contacts
• EN ISO 13850 compliant latching mechanism with blue pushbutton release
• Suitable for cable lengths up to approximately 5 meters
• High-visibility blue reset button
• IP65 protection rating for industrial use
• Screw terminal connections for secure wiring

Technical Specifications

• Article Number: 3SE7120-1BF00
• Enclosure Material: Metal housing with plastic cover
• Colour: Metal body (silver/grey) with blue pushbutton
• Cable Entries: 2 × M20 × 1.5
• Contact Configuration: 2NC
• Rated Insulation Voltage (Ui): 400 V
• Thermal Current (Ith): 6 A
• Rated Impulse Withstand Voltage: 6 kV
• Operating Current AC-15: 6 A at 240/400 V
• Operating Current DC-13: 3 A at 24 V; 0.27 A at 250 V
• Mechanical Service Life: approx. 100,000 switching cycles
• Operating Temperature: –25 °C to +70 °C
• Protection Rating: IP65
• Actuation Type: Cable-operated, up to 5 m
• Dimensions (H × W × D): 171 × 52 × 54 mm
• Mounting Type: Surface mounting

Compliance & Certifications

• Emergency-stop function compliant with EN ISO 13850
• Manufactured according to Siemens SIRIUS safety device standards
• Suitable for certified emergency-stop systems and industrial safety zones

Applications

Designed for conveyor systems, automated production lines, processing equipment and industrial machinery requiring long-distance cable-pull emergency-stop capability. Ideal where operators must trigger an emergency stop from any point along the machine perimeter or conveyor path.