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Red plastic mushroom-head push button 22 mm diameter 40 mm head

SIEMENS

SIEMENS 3SU1000-1HA20-0AA0 Mushroom Head Push Button Red 22 mm

SKU CH-BMZZ-4A0P3

Red 22 mm maintained mushroom push button with IP66, IP67, IP69 and IP69K ratings

  • Mushroom head provides clear emergency stop identification
  • 40 mm diameter ensures easy actuation in critical moments
  • IP66 IP67 IP69 IP69K ratings protect against dust and high-pressure washdown
  • NEMA 1 2 3 3R 4 4X 12 enclosures suit indoor and outdoor installations
  • Plastic construction resists corrosion while meeting REACH RoHS WEEE standards

22 mm Mushroom Head Push Button

The SIEMENS 3SU1000-1HA20-0AA0 is a 22 mm mushroom head push button designed for industrial control panels. It features a maintained red operator with a 40 mm diameter head constructed entirely from plastic materials. The device carries NEMA ratings 1, 2, 3, 3R, 4, 4X, 12 and IP ratings IP66, IP67, IP69, IP69K for robust environmental protection. It complies with REACH, RoHS and WEEE 2012/19/EU standards.

Suited for safety stop and heavy-duty control

This push button suits operators who need a highly visible, maintained emergency stop or safety interlock actuator on machinery panels. The red mushroom head provides clear identification in harsh environments rated up to IP69K. It is not for applications requiring illuminated indication, momentary action, or a legend plate on the operator head. Buyers needing a different colour, key-release mechanism, or flush-mounted style should look at alternative operator types.

Panel integration and wiring freedom

The 22 mm mounting diameter fits standard industrial cut-outs, allowing direct installation into existing enclosures without adapters. Its plastic bezel and head resist corrosion while the high IP ratings free the designer from additional sealing measures in wash-down or outdoor zones. Low-voltage operation simplifies control circuit design and reduces insulation requirements inside the cabinet. The maintained action holds the circuit state until manually reset, supporting safety relay logic.

How it compares

Measured against everything we stock in Push-Button & Disconnect Switches, at today’s prices. Recalculated every night.

Price $20.99
Typical for this category: the median of 194 items is $19.49.

Specifications

Product
Brand nameSIEMENS

Questions about this item

What size panel cut-out does this 22 mm mushroom head push button require?

It fits a standard 22 mm mounting hole in panels rated for NEMA 1, 12, 2, 3, 3R, 4, 4X and IP66, IP67, IP69, IP69K.

Can the maintained red operator replace an older momentary 22 mm button on the same enclosure?

Yes, the 40 mm plastic head mounts in the same 22 mm cut-out, but the maintained action stays latched until turned, unlike a momentary type.

How do I confirm the IP69K seal is intact after installation?

Press the red mushroom head firmly; it should latch smoothly and show no gaps between the plastic bezel and the panel surface.

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