Mushroom 787602 40mm Push Button Head

The Mushroom 787602 is a 40mm diameter red mushroom push button head designed for industrial control applications requiring a highly visible, easy-to-actuate operator. Typically used as an emergency stop actuator or a palm-operated momentary switch, this mushroom head is compatible with standard 22mm mounting hole control stations. The large concave surface allows operation with the palm or fist, ensuring quick response in critical situations. The red color, combined with the mushroom shape, provides high visibility and immediate recognition of the emergency stop function. The 787602 is suitable for use with a wide range of contact blocks from various manufacturers, offering flexibility in control system design. Its robust construction withstands harsh industrial environments, including exposure to oils, coolants, and moderate impact.

Technical Specifications

Actuator type: mushroom push button head. Diameter: 40 mm (1.57 inches). Color: red (standard for emergency stop). Operation: momentary (spring return). Mounting hole diameter: 22 mm (0.86 inches). Material: thermoplastic housing with impact-resistant lens. Protection rating (actuator only): IP65, dust-tight and protected against water jets. Operating temperature: -25°C to +70°C. Mechanical life: > 1,000,000 operations. The actuator is designed to be used with standard 22mm contact blocks (sold separately). When paired with a normally closed contact block and a twist-release mechanism (if required), it can form a complete emergency stop pushbutton station. The mushroom head is secured to the contact block via a central screw or bayonet mount, depending on the specific contact block series. The 787602 does not include any electrical contacts; it is purely a mechanical actuator.

Key Features

• 40mm red mushroom head for high visibility and easy palm operation

• Momentary spring-return action

• Compatible with standard 22mm panel cutouts

• IP65 protection rating suitable for industrial environments

• Impact-resistant thermoplastic construction

• Mechanical life exceeding 1 million cycles

• Designed for emergency stop and safety-related applications

• Easy installation with central screw or bayonet locking

Applications

The 787602 is primarily used as the actuator for emergency stop pushbutton stations on industrial machinery, conveyor systems, packaging equipment, and automated production lines. It can also be used as a large, easy-to-hit palm button for machine start/stop in high-traffic areas. The IP65 rating allows installation in control cabinets exposed to dust or light moisture, such as food processing plants and automotive workshops. The actuator is often paired with a positive-opening NC contact block (e.g., with forced opening mechanism) to meet safety standards such as ISO 13850 for emergency stop devices.

Installation

Mount the mushroom head through a 22mm diameter hole in the control panel or operator station enclosure. The actuator is secured by a retaining ring or by the contact block itself. Insert the contact block into the back of the mushroom head, aligning the actuator stem with the block’s mechanism. Tighten the contact block’s locking ring or screws to secure both components to the panel. Ensure that the actuator moves freely and returns to the rest position when released. For emergency stop applications, the actuator should be positioned so that it can be easily reached from the machine’s operating position. No electrical wiring is required on the actuator itself; wiring is done on the contact block.

Compatibility

The 787602 is designed to be compatible with a wide range of 22mm contact blocks, including those from Schneider Electric (ZB2, XB4 series), Siemens (SIRIUS), Eaton (RMQ-Titan), ABB (M2M series), and others. When selecting a contact block, ensure that the actuator’s stem length and profile match the block’s actuation mechanism. For emergency stop applications, use a contact block with forced opening (positive opening) action, such as a normally closed block with a “NC” designation and a mechanical plunger that opens the contacts when the mushroom head is pressed. The actuator itself does not have a twist-release function; for a latching emergency stop (push-to-lock, pull/twist-to-release), a compatible contact block with mechanical latching mechanism is required.

Maintenance and Inspection

Inspect the mushroom head periodically for cracks, discoloration, or signs of impact damage. Replace the actuator if the red paint is worn or if the head becomes loose on the panel. The mushroom head can be cleaned with a mild detergent and a soft cloth; avoid abrasive cleaners that may remove the red color. The mechanical life is long, but if the actuator feels sticky or does not return fully, remove it and check for debris or damage to the spring mechanism. If used in an emergency stop circuit, test the actuator daily by pressing it and verifying that the machine stops.

Environmental and Compliance

The 787602 mushroom head complies with IEC 60947-5-1 and IEC 60947-5-5 standards for emergency stop actuators. It meets RoHS requirements. The IP65 protection rating is tested per IEC 60529. Operating temperature: -25°C to +70°C. The actuator is suitable for use in pollution degree 3 environments when properly installed in a suitable enclosure.

Conclusion

The Mushroom 787602 40mm red push button head is a reliable, highly visible actuator for emergency stop and palm-operated controls. Its compatibility with standard 22mm contact blocks and robust IP65 construction make it a practical choice for industrial machinery safety systems.