Overview
The Square D 8501-HMO30 is a Class 8501 general-purpose industrial relay built for dependable switching control in factory automation, machinery control, and electrical panel applications. This Type HMO variant provides the reliability that maintenance technicians and controls engineers trust for long-term circuit protection and control operations.
Key Features
- Class 8501 industrial-rated design for multi-pole switching applications
- Suitable for AC control circuits up to 240 VAC maximum
- Fast pickup and dropout response for precise control timing
- Wide operating temperature range: -45°C to +70°C (-49°F to +158°F)
- Industry standard terminal arrangement and pin configuration
- New condition, no factory packaging
Technical Specifications
- Manufacturer: Square D
- Model Number: 8501-HMO30
- Class/Type: Class 8501 Type HMO
- Maximum Voltage: 240 VAC
- Operating Temperature: -45°C to +70°C
- Pickup Time: 13 ms (typical)
- Dropout Time: 6 ms (maximum)
- Condition: New – No Box
Typical Applications
- Industrial machinery control and protection circuits
- Motor starter and contactor applications
- Electrical panel switching and automation
- Process control and equipment sequencing
- General-purpose industrial relay replacement
Compatibility & Replacements
Compatible With
- Square D 8501 Type HMO sockets and rail mounting systems
- Industrial 240 VAC control circuits
- Standard industrial electrical panels and control enclosures
- Machinery and process automation equipment
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. Exact replacement part numbers should be confirmed against your original equipment documentation.
Works With
- Square D control circuit devices and assemblies
- Standard industrial relay sockets and mounting systems
- Industrial electrical control systems and panel wiring


















