Overview
The Square D 8501 XTE2 is a pneumatic timing relay attachment designed to work with Square D Class 8501 Type X NEMA control relays. This timing module provides precise on-delay functionality and is widely used in legacy industrial control systems, machine tools, and automation applications where reliable timed switching is essential. The 8501 series has been a standard in industrial control since the 1970s and remains a trusted choice for retrofit and replacement projects.
Key Features
- Pneumatic On-Delay Timing: Timing range from 5 to 180 seconds
- Contact Configuration: One normally closed and one normally open timed contact
- Certifications: UL listed and CSA certified
- Terminal Type: Screw clamp terminals for secure wiring
- Modular Design: Can be added to a standard 4 pole relay
- Standard Compatibility: Uses standard 8501XC1 relay cartridges
Technical Specifications
- Relay Type: Class 8501 Type X NEMA Control Relay Attachment
- Timing Adjustment: 5–180 seconds
- Timing Mode: On-Delay
- Contact Type: 1 NO / 1 NC (timed)
- Terminal Connection: Screw clamp
- Contact Cartridge: 8501XC1
- UL File: Listed
- CSA File: Certified
- Environmental: Industrial control panel mounting
Typical Applications
The Square D 8501 XTE2 timing attachment is commonly deployed in:
- Machine tool starting circuits requiring controlled startup delays
- Conveyor belt sequencing and interlock systems
- Motor soft-start and ramp-up control
- Industrial automation timing logic
- Retrofit replacements in legacy control cabinets
- Manufacturer equipment with original Square D relay infrastructure
Compatibility & Replacements
Compatible With
- Square D Class 8501 Type X NEMA control relays (4-pole base units)
- 8501X relay family standard configurations
- Industrial control panels using Class 8501 architecture
- Machine tool builders employing Square D relay modules
Replaces / Drop-In Replacement For
- Original equipment timing modules in legacy 8501X installations
- Worn or damaged Type XT timing attachments
- Verify compatibility with your system integrator before ordering
Works With
- Square D Class 8501 series base relays
- Modular contact cartridge architecture (XC1, XC2, XC4 types)
- NEMA industrial control panel wiring standards
- Screw terminal connection systems
