Overview
The Allen-Bradley 700-NT400A1 is a pneumatic timing control relay designed for general-purpose industrial automation and control applications. This compact unit combines a Bulletin 700 base relay with an integrated pneumatic time delay module, providing reliable ON-delay or OFF-delay timing functions with adjustable timing ranges. The relay’s proven design and rugged construction make it a standard choice for machine control, process automation, and legacy system maintenance.
Key Features
- Four normally open (4NO) contacts with 4PST configuration
- Pneumatic timing mechanism with adjustable ON-delay and OFF-delay settings
- High contact make rating of 7200VA and break rating of 720VA (NEMA A300)
- Screw terminal connections for reliable field wiring
- Compact footprint suitable for control panel mounting
- Dual frequency coil: 110/120V AC, 50/60 Hz operation
Technical Specifications
The relay operates on a standard 110–120 VAC coil voltage compatible with both 50 Hz and 60 Hz industrial power supplies. Its pneumatic timing unit enables flexible timing control in applications requiring repeatable delays without electronic components.
Typical Applications
- Machine tool control circuits and sequential operation
- Conveyor system logic and interlocking
- Pump and motor start/stop sequencing with time delays
- Legacy automation system replacement and retrofit
- Process timers in manufacturing and assembly operations
- Emergency stop circuits and safety-related timing functions
Compatibility & Replacements
Compatible With
- Standard 24 VDC and 120 VAC industrial control circuits
- Control panels equipped with standard relay sockets and DIN rail mounting
- Legacy Allen-Bradley Bulletin 700 relay systems
- Any 24/120 VDC or 120 VAC logic control architecture
Replaces / Drop-In Replacement For
- Other Allen-Bradley 700-N series base relays with pneumatic timing attachments
- Earlier generation 700-N and 700-P pneumatic relay combinations
Works With
- Allen-Bradley motor starters and contactors
- Manual and semi-automatic control systems
- Pneumatic timing modules and attachments
- Standard industrial pushbutton and selector switch circuits
