A-B 836T-T251J Pressure Control Switch

Allen-Bradley 836T-T251J Pressure Control Switch

 

Product Description

The Allen-Bradley 836T-T251J is a Bulletin 836T electromechanical pressure control switch designed for monitoring and controlling hydraulic, pneumatic, and industrial fluid pressure systems. It uses a copper alloy bellows sensing element and provides reliable pressure-actuated switching for machine tools, compressors, pumps, and general industrial automation. The unit features a rugged Type 1, 4, and 13 enclosure suitable for demanding industrial environments.

Specifications

• Brand: Allen-Bradley (Rockwell Automation)
• Model: 836T-T251J
• Series: Bulletin 836T
• Type: Electromechanical Pressure Control Switch
• Operating Pressure Range: Vacuum to 35 psi (factory configuration)
• Adjustable Differential: Approximately 2–7 psi
• Maximum Working Pressure: 80 psi
• Occasional Surge Pressure: 90 psi
• Contact Configuration: SPDT, 2-circuit contact block
• Pressure Element: Copper alloy bellows
• Process Connection: 1/4 in. NPT female
• Electrical Connection: Screw terminals
• Enclosure Rating: Type 1, Type 4, and Type 13
• Rated Voltage: Up to 600 VAC / 115 VDC

Working Principle

The pressure switch monitors system pressure through its bellows assembly. When the pressure reaches the preset trip point, the internal SPDT contacts change state to start, stop, or signal connected equipment. The switch automatically resets when the pressure returns to the configured differential range.

Main Features

• Electromechanical pressure sensing
• Adjustable operating pressure and differential
• Copper alloy bellows for reliable pressure detection
• SPDT 2-circuit contact block
• Rugged industrial enclosure
• Screw terminal wiring
• Long mechanical service life
• Suitable for machine tool and industrial automation applications

Typical Applications

• Hydraulic systems
• Pneumatic equipment
• Air compressors
• Industrial pumps
• Machine tools
• Cooling and lubrication systems
• Process control equipment
• Industrial pressure monitoring

Advantages

• High reliability electromechanical design
• Easy pressure adjustment
• Durable construction for harsh environments
• Stable switching performance
• Compatible with standard industrial control circuits
• Long operating life with minimal maintenance

Important Notes

• Pressure control switch only (not a pressure transmitter)
• Mechanical switching device (not electronic)
• Suitable for industrial control circuits
• Requires proper pressure adjustment before operation