Siemens RONIS Key-operated switch, round, 2 pos O-I, 22mm Part number 3SU1050-4BF01-0AA0

Product Overview

The Siemens 3SU1050-4BF01-0AA0 is a key-operated switch head from the SIRIUS ACT 3SU10 series. Designed for a 22 mm panel cut-out and featuring a metal, shiny finish, it offers two switch positions (O-I), latching actuation with a 90° rotation, and is supplied with two keys. Lock number SB30 is standard with optional special locks available.

Key Features

• Key-operated switch head (RONIS type) for 22 mm panel mounting
• Metal, shiny housing for robust industrial appearance and durability
• 2 positions (O-I) with latching mechanism and 90° actuation angle
• Supplied with 2 keys; lock number SB30 standard, alternatives available
• Key removable only in the OFF “O” position, enhancing security
• High ingress protection when properly installed – up to IP66/IP67/IP69K depending on mounting

Technical Specifications

• Product Series: SIRIUS ACT 3SU10
• Article Number: 3SU1050-4BF01-0AA0
• Panel Cut-out Diameter: 22 mm standard
• Actuator Type: Key-operated switch head
• Switch Positions: Two (O / I)
• Actuation Angle: 90°
• Standard Lock Number: SB30 (2 keys included)
• Housing Material & Finish: Metal, high-gloss finish
• Protection Rating: Up to IP66/IP67/IP69K (depending on installation)
• Operating Temperature Range: –25 °C to +70 °C
• Mechanical Life: Around 300 000 operations

Compliance & Certifications

• Manufactured by Siemens under the SIRIUS ACT standard for commanding and signalling devices
• Complies with IEC/EN 60947-5-1 standards for auxiliary and signalling switches
• Designed for demanding industrial applications requiring secure key-operation and high mechanical endurance

Applications

Ideal for control panels, machine operator stations and industrial switchgear where key-operation is required for secure switching. Commonly used to control access to machine modes, enable/disable circuits, or provide locked switch functionality in automated production environments.