Overview
The Allen-Bradley 800H-QPT24 is a 30 mm momentary pushbutton operator designed for Type 4/4X/13 hazardous location applications. This unit provides robust electrical control in Class I and Class II explosive or combustible environments, delivering the reliability and durability required in chemical plants, refineries, grain handling facilities, and other regulated industries. The 600VAC rating ensures full-voltage operation across a wide range of industrial machinery and process control systems.
Key Features
- Momentary Contact Operation: Returns to neutral position when released; ideal for start/stop, alarm reset, or cycle advance controls
- 600VAC Full-Voltage Rating: Supports both AC and DC control circuits without need for additional transformers or power conditioning
- Hazardous Location Certification: Listed for Class I, Division 1/2 and Class II, Division 1/2 explosive atmospheres per NEC and IEC standards
- Type 4/4X/13 Enclosure Compliance: Weather-tight, corrosion-resistant design for indoor and outdoor installation
- Modular Contact Block Design: Standard NO/NC contact configurations; field-replaceable blocks support future reconfiguration
- Proven 800H Operator Platform: Decades of industrial field reliability in the most challenging environments
Technical Specifications
- Contact Type: Momentary (spring-return)
- Operating Voltage: 600VAC full voltage
- Contact Ratings: See manufacturer datasheet for contact block amperage ratings (varies by contact material: standard, PenTUFF, or Logic Reed options)
- Operator Head Size: 30 mm
- Enclosure Rating: Type 4/4X/13 (NEMA); IP66/67 (IEC)
- Hazardous Location Class: Class I, Div. 1/2 (Explosive Gas); Class II, Div. 1/2 (Combustible Dust); Class III (Hazardous Fibers)
- Operating Temperature: −20 °C to +60 °C (consult datasheet for condensation and freezing conditions)
- Mounting: 30.5 mm panel cutout; standard and long-barrel options available for panel thickness up to 63.5 mm
- Mounting Pressure: 2 lbs max. for standard mushroom operator head
- Certifications: UL, cUL, Class I Group B, ATEX, IEC 61439-1
- Series: Bulletin 800H (Type 4/4X/13)
Typical Applications
- Remote start/stop stations in explosive gas environments (refineries, petrochemical plants)
- Process control actuation in grain elevators and flour mills (Class II, Division 2)
- Equipment interlocks and emergency stop circuits in hazardous manufacturing areas
- Outdoor and corrosive-atmosphere control panels (Type 4X stainless steel enclosures)
- SCADA/DCS field operator interfaces requiring seismic or industrial shock resistance
Compatibility & Replacements
The Allen-Bradley 800H-QPT24 operator is compatible with all standard 800H contact block modules (800H-XCAB series, 800H-XC series). Field replacement kits are available through authorized Allen-Bradley distributors. For alternative operators or non-hazardous applications, the 800T series (Type 4/13, non-certified for hazardous locations) offers similar mechanical interface but without explosive atmosphere certification. Always consult the Bulletin 800-TD011 Hazardous Location Push Button Specifications datasheet from Rockwell Automation for complete contact block compatibility, voltage derating, and sealing requirements.
