Siemens E- Stop 3SU18 Series Twist Release

The Siemens SIRIUS ACT 3SU18 Series Emergency Stop Push Button is a robust industrial safety device designed to provide immediate machine shutdown in emergency situations. Featuring a highly visible red mushroom head with a twist-release mechanism, the 3SU18 series is commonly used on machinery, production lines, control panels, automation systems, and industrial equipment where operator safety is critical. Designed to meet international emergency stop requirements, the unit combines durability, reliability, and easy operation in demanding industrial environments.

Key Features

• Emergency stop mushroom push button
• Twist-release reset mechanism
• High-visibility red actuator with yellow safety housing
• Designed for machine and equipment emergency shutdown
• Rugged industrial construction
• Suitable for control panels and machinery installations
• Fast and reliable emergency actuation
• Compact surface-mount design
• IP66, IP67, IP69 and IP69K protection ratings (model dependent)
• Long service life in harsh industrial environments

Specifications

• Manufacturer: Siemens
• Series: SIRIUS ACT 3SU18
• Type: Emergency Stop Push Button
• Release Method: Twist Release
• Head Style: Mushroom Push Button
• Head Diameter: 40 mm
• Contact Configuration:
  • 1 NO + 1 NC (varies by model)
  • 1 NC or 2 NC versions available
• Terminal Type: Screw Terminal (model dependent)
• Contact Rating:
  • Up to 10 A
  • Up to 500 VAC / 500 VDC
• Housing Material: Industrial Plastic / Polyamide
• Mounting: Surface Mount or Panel Mount (version dependent)
• Cut-Out Diameter: 22 mm (panel mount versions)
• Protection Rating:
  • IP66
  • IP67
  • IP69
  • IP69K
• Operating Temperature:
  • -25°C to +70°C

Function

The Siemens 3SU18 Emergency Stop Push Button is designed to immediately interrupt machine operation when pressed during an emergency. Once activated, the button remains latched until manually reset by twisting the mushroom head. This safety function helps protect personnel, equipment, and processes by providing a rapid and reliable shutdown mechanism. The device is suitable for safety circuits and emergency stop applications in accordance with international machinery safety standards.

Typical Applications

• Industrial machinery
• Manufacturing equipment
• Packaging lines
• Conveyor systems
• Process automation
• Control panels
• Robotics systems
• Material handling equipment
• Safety shutdown circuits