SIEMENS
SIEMENS 3SU1000-1HB20-0AA0 Mushroom Head Push Button Red 22mm
Red 22 mm mushroom-head push button with maintained action, IP66/IP67/IP69K sealing and NEMA 1, 2, 3, 3R, 4, 4X, 12 ratings
- Maintained action stays engaged until reset
- 40 mm mushroom head gives clear visual identification
- Red colour signals emergency stop function
- IP66, IP67, IP69 and IP69K ratings resist water and dust ingress
- NEMA 1, 2, 3, 3R, 4, 4X and 12 ratings suit indoor and outdoor use
Red mushroom emergency stop
The SIEMENS 3SU1000-1HB20-0AA0 is a 22 mm maintained mushroom head push button designed for emergency stop functions on industrial control panels. Its red colour and 40 mm head diameter make the actuator clearly visible and easy to strike with a gloved hand. The plastic construction keeps the unit light while meeting low voltage requirements. It suits machine builders and maintenance teams fitting safety circuits on conveyors, packaging lines or process equipment.
IP66 IP67 IP69 IP69K sealing
The operator carries IP66, IP67, IP69 and IP69K ratings alongside NEMA 1, 2, 3, 3R, 4 and 4X, so it withstands high pressure washdown, dust ingress and temporary immersion. No active cooling or power draw is involved because the device is a purely mechanical switch operator. The maintained action means the button stays latched until deliberately reset, giving a clear visual indication of the stop state without consuming control power.
Plastic bezel and 22 mm panel cutout
The head, bezel and base are all plastic, providing corrosion resistance in wet or chemical environments while avoiding conductive surfaces. A standard 22 mm mounting hole allows direct installation in common enclosure cutouts without adapters. Compliance with REACH, RoHS and WEEE 2012/19/EU confirms the materials meet current substance restrictions for European markets. The legend plate area is not applicable, so users add their own labelling if required.
Highlights
- Maintained action stays engaged until reset
- 40 mm mushroom head gives clear visual identification
- Red colour signals emergency stop function
- IP66, IP67, IP69 and IP69K ratings resist water and dust ingress
- NEMA 1, 2, 3, 3R, 4, 4X and 12 ratings suit indoor and outdoor use
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
How is the 22 mm mushroom head push button installed, and what step do people often get wrong?
Mount the operator through a 22 mm panel cut-out and secure it with the locking nut; the step often missed is tightening the nut to the specified torque so the IP66, IP67, IP69 and IP69K seals remain effective.
What maintenance or replacement will the red 40 mm mushroom head need later?
The plastic head, bezel and base are rated for NEMA 1, 2, 3, 3R, 4, 4X and 12; inspect periodically for UV degradation or impact damage and replace the complete operator if the red colour fades or the maintained action sticks.
What limit appears first under sustained use of this maintained push button?
The mechanical endurance of the maintained latching mechanism is the first limit; repeated actuation cycles will eventually cause the latching function to fail before the IP66, IP67, IP69 or IP69K sealing does.
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