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Siemens 3SU1851-0NB00-2AC2 Metal E-STOP Enclosure w/ Protective Collar

Siemens 3SU1851-0NB00-2AC2 Metal Enclosure with Emergency Stop Pushbutton.

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ManufacturerSiemens

Part number3SU1851-0NB00-2AC2

Size 22 mm

Shape Round

Enclosure Material Metal

Enclosure Top Part Yellow

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Durable Metal Enclosure 22mm Yellow E-STOP Pushbutton Red 40mm Mushroom Head Protective Collar Rotate-to-Unlatch Reset 1 NC Contact Screw Terminals Floor Mounting

Product description

The Siemens 3SU1851-0NB00-2AC2 is a metal enclosure for 22mm round command devices, featuring a yellow top part and a protective collar for enhanced durability. This unit houses a red 40mm mushroom E-STOP pushbutton requiring a rotate-to-unlatch action for reset, and it includes one normally closed (NC) contact. It is equipped with screw terminals for reliable electrical connections and is designed for floor mounting with M20 cable entries at the top and bottom.

This enclosure is critical for safety applications, offering a robust solution for emergency stop functions in industrial environments. It is suitable for machine control, manufacturing plants, and any scenario where immediate safety intervention is paramount. The protective collar adds an extra layer of defense for the E-STOP button.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3SU1851-0NB00-2AC2. We provide a reliable source for industrial automation and safety components. Trust Stanlo Automation for your surplus parts, ensuring operational continuity and safety.

Technical specifications

Size	22 mm
Shape	Round
Enclosure Material	Metal
Enclosure Top Part	Yellow
Protective Collar	Yes
Control Point	1x Mushroom E-STOP Pushbutton (red, 40mm)
Reset	Rotate-to-unlatch
Contact	1 NC
Terminal Type	Screw Terminal
Mounting	Floor Mounting
Cable Entry	1xM20 top, 1xM20 bottom

Common applications

Industrial Safety Systems

Machine Safety

Emergency Shutdown

Control Panels

Manufacturing Equipment

Hazardous Locations

Safety Controls

Compatible systems

Siemens 22mm command devices 3SU1 command device series Industrial safety circuits

Also known as

Siemens 3SU1851 E-STOP Enclosure 3SU1851 Mushroom Pushbutton Unit Siemens Metal Emergency Stop

Replaces / compatible with

This unit is part of the Siemens 3SU1 series and provides a standard emergency stop function with a protective collar for added durability. It can replace similar E-STOP units or be integrated into new safety circuits.

Technical note

Expert tip

The protective collar around the mushroom head helps prevent accidental activation and protects the button mechanism from damage.

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Frequently asked questions

What is the protective feature of the Siemens 3SU1851-0NB00-2AC2 enclosure?

The Siemens 3SU1851-0NB00-2AC2 features a protective collar around the red 40mm mushroom E-STOP pushbutton, enhancing its durability and resistance to accidental impacts. It includes one NC contact and uses screw terminals for reliable connections.