Siemens RONIS key-operated switch, 22 mm, round, lock number SB30, with 2 keys, 2 switch positions Part number 3SU1050-4BF21-0AA0

Product Overview

The Siemens 3SU1050-4BF21-0AA0 is a key-operated switch head from the SIRIUS ACT series, designed for 22 mm panel cut-outs. It features a two-position latching mechanism (O-I), a key withdrawal position of “I”, and includes two keys. Its polished metal body and high protection rating make it suitable for demanding industrial and outdoor panel applications.

Key Features

• Key-operated switch head, SIRIUS ACT 3SU10 family
• 22 mm round panel cut-out diameter
• Two switching positions (O-I) with a 90° actuating angle (10:30h / 13:30h)
• Key withdrawal in position “I” (ON)
• Metal high-gloss body design for robust aesthetics and durability
• High protection class (IP66, IP67, IP69K) for reliable operation even in harsh environments
• Operating ambient temperature range from -25 °C to +70 °C

Technical Specifications

• Article Number: 3SU1050-4BF21-0AA0
• Actuator Type: Keylock switch head
• Cut-out Diameter: 22.3 mm (round)
• Number of Positions: 2 (O / I)
• Actuating Angle: 90° (10:30h / 13:30h)
• Protection Rating: IP66, IP67, IP69K (depending on mounting and sealing)
• Mechanical Service Life (typical): approx. 300 000 switching cycles
• Ambient Temperature (Operation): -25 °C … +70 °C
• Material / Finish: Metal high-gloss body
• Included Keys: 2 keys (key type SB30)
• Weight (approx): ~0.08 kg

Compliance & Certifications

• Designed to meet industrial switchgear accessory standards for panel-mount actuators
• Suitable for outdoor or aggressive industrial environments thanks to high ingress protection and durable materials
• Engineered as part of the Siemens SIRIUS ACT series with global approvals and high reliability

Applications

The 3SU1050-4BF21-0AA0 is ideal for use in control panels, operator stations and enclosed machines where a key-lock switch actuator is needed. Typical applications include machine guarding, security interlocks, access control switches, infrastructure panels and process automation installations where only authorized personnel should operate or withdraw the key.