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Red 22mm metal emergency stop mushroom head with Ronis SB30 key

SIEMENS

SIEMENS 3SU1050-1HF20-0AA0 Emergency Stop Push Button 22mm Red Keyed

SKU CH-Z2CH-KNM6J

A 22 mm red emergency-stop mushroom head with keyed maintained release, metal construction, IP66/IP67/IP69K sealing and NEMA 1, 2, 3, 3R, 4, 4X, 12 ratings

  • Emergency stop with 40 mm mushroom head for fast actuation
  • Keyed reset using Ronis SB30 prevents unauthorised restart
  • NEMA 1, 2, 3, 3R, 4, 4X, 12 ratings suit harsh environments
  • IP66, IP67, IP69, IP69K sealing resists high-pressure washdown
  • Metal head, bezel and body withstand heavy industrial use

Emergency Stop Push Button 22 mm

The SIEMENS 3SU1050-1HF20-0AA0 is a maintained emergency stop push button with a 40 mm mushroom head designed for industrial safety circuits. It suits machine builders and maintenance teams who need a keyed reset to prevent accidental restart after an emergency stop.

Panel mounting and key reset

The 22 mm mounting diameter fits standard panel cutouts and the metal bezel secures with a locking nut for a firm fit. The Ronis SB30 key enables reset from any position, and the only common issue is losing the key, which leaves the button locked until a replacement is sourced.

Sealed for continuous industrial use

Rated IP66, IP67, IP69 and IP69K alongside NEMA 1, 2, 3, 3R, 4 and 4X, the metal head and bezel resist high-pressure washdown and dust ingress during sustained operation. The maintained action holds the stop state without spring fatigue, and the low-voltage design matches safety relay circuits. Not for applications that require illuminated status indication or a twist-to-release mechanism.

Highlights

  • Emergency stop with 40 mm mushroom head for fast actuation
  • Keyed reset using Ronis SB30 prevents unauthorised restart
  • NEMA 1, 2, 3, 3R, 4, 4X, 12 ratings suit harsh environments
  • IP66, IP67, IP69, IP69K sealing resists high-pressure washdown
  • Metal head, bezel and body withstand heavy industrial use

Specifications

BrandSIEMENS

Questions about this item

How do I verify the emergency stop button is working correctly after installation?

Press the 40 mm mushroom head to confirm it latches in the maintained position, then insert the Ronis SB30 key and turn to any position to ensure the contacts release and the actuator resets.

What comes in the box and what must be purchased separately?

The package includes the 22 mm metal emergency stop operator with mushroom head and one Ronis SB30 key; mounting hardware, contact blocks and legend plates are not included.

Which version should I choose for an outdoor panel exposed to high-pressure washdown?

Select this 3SU1050-1HF20-0AA0 model — its IP66, IP67, IP69 and IP69K ratings together with NEMA 1, 2, 3, 3R, 4, 4X and 12 cover dust, water jets and high-temperature washdown.

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