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Siemens 3SU1851-0NB00-2AA2 Metal E-STOP Enclosure (2 NC)

Siemens 3SU1851-0NB00-2AA2 Metal Enclosure with Emergency Stop Pushbutton (2 NC).

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ManufacturerSiemens

Part number3SU1851-0NB00-2AA2

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 Dual 2 NC Contacts Rotate-to-Unlatch Reset Screw Terminals Floor Mounting M20 Cable Entries

Product description

The Siemens 3SU1851-0NB00-2AA2 is a metal enclosure for 22mm round command devices, featuring a yellow top part. This unit is equipped with a red 40mm mushroom E-STOP pushbutton designed for immediate shutdown, requiring a rotate-to-unlatch action for reset. It uniquely provides two normally closed (NC) contacts for enhanced safety redundancy. The enclosure uses screw terminals for secure connections and is designed for floor mounting with M20 cable entries at the top and bottom.

This enclosure is vital for applications demanding the highest level of safety, especially where dual-channel E-STOP functionality is required. It is ideal for heavy machinery, automated production lines, and environments with significant operational risks, ensuring fail-safe operation.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3SU1851-0NB00-2AA2. We provide reliable access to critical safety components and other industrial automation parts. Rely on Stanlo Automation for your surplus needs and maintain operational integrity.

Technical specifications

Size	22 mm
Shape	Round
Enclosure Material	Metal
Enclosure Top Part	Yellow
Control Point	1x Mushroom E-STOP Pushbutton (red, 40mm)
Reset	Rotate-to-unlatch
Contacts	2 NC
Terminal Type	Screw Terminal
Mounting	Floor Mounting
Cable Entry	1xM20 top, 1xM20 bottom

Common applications

Industrial Safety

Machine Safety

Emergency Shutdown

Dual-Channel Safety Circuits

Heavy Machinery

Automation Lines

Safety Control Systems

Compatible systems

Siemens 22mm command devices 3SU1 command device series Industrial safety circuits requiring dual NC contacts

Also known as

Siemens 3SU1851 Dual NC E-STOP 3SU1851 Emergency Stop Unit Siemens 2 NC Pushbutton Enclosure

Replaces / compatible with

This unit offers enhanced safety with two NC contacts, suitable for replacing single-contact E-STOP units where increased redundancy is desired or required by safety standards.

Technical note

Expert tip

The dual NC contacts are essential for safety circuits that require monitoring of two independent pathways for reliable E-STOP activation.

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Frequently asked questions

What makes the Siemens 3SU1851-0NB00-2AA2 suitable for high-safety applications?

The Siemens 3SU1851-0NB00-2AA2 is designed for high safety with its dual normally closed (NC) contacts, providing redundancy for emergency stop functions. It features a red 40mm mushroom E-STOP pushbutton with a rotate-to-unlatch reset in a yellow metal enclosure.