Siemens IP20 Key Switch, SPST 2-Way Flat Key, Latching, 500V AC/DC, 1,000,000 Cycles

Siemens 3SU1100-4BF11-1BA0 IP20 Key Switch is a reliable, high-performance switch offering secure control in demanding industrial and electrical applications. Featuring a robust plastic housing rated at IP20, it protects the internal mechanism from ingress by solid objects larger than 12mm, making it suitable for indoor environments requiring dust protection but not water sealing.

This key switch is designed with a latching mechanism, allowing the key to rotate 90° and remain in the set position until manually turned back. The SPST (Single Pole Single Throw) contact configuration provides straightforward on/off switching with two secure positions, ideal for controlling access to electrical circuits and equipment.

Operating over a temperature range of -25°C to 70°C, the switch can withstand challenging environments without degradation of performance. The contact rating supports up to 500V AC/DC, allowing use in a wide variety of industrial control panels, including fire alarms, data cabinets, fuse boxes, and heavy machinery operation.

The switch design includes screw terminals, ensuring mechanically stable and vibration-resistant wiring connections, critical for reliability in industrial settings. The flat key and round bezel complement professional panel mounting, designed to fit standard 22mm cutouts with ease and security.

With a mechanical life expectancy of 1,000,000 cycles, this switch provides long service life, reducing maintenance and replacement frequency. The product is part of Siemens' SIRIUS ACT series, well-known for industrial safety and quality standards, including CCC, CE, CSA, and UL approvals.

Features latching switch operation with 2 positions for secure control. IP20-rated plastic housing provides protection against solid objects larger than 12mm. Operates over a wide temperature range from -25°C to 70°C for harsh environments.

Accommodates contact voltage up to 500V AC/DC ensuring versatile usage. Mechanical life rated at 1,000,000 cycles for long-lasting durability. Screw terminal type ensures vibration-proof wiring connections. Flat key design with a 90° key index angle facilitates controlled access.

Round bezel shape enhances panel integration aesthetic and function. Manufactured in Germany under the SIRIUS ACT series complying with international safety standards.

This key switch is ideal for industrial, manufacturing, electrical, HVAC, and automation applications where operator safety and access control are critical. It delivers dependable operation in control panels, ensuring systems activate only with authorized key use.

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