Overview
The Furnas 48FC31AA3 is a Class 48 melting alloy thermal overload relay engineered for dependable motor protection in industrial motor control circuits. This three-phase unit uses proven melting alloy technology to detect sustained overload conditions and trip the associated motor starter, preventing equipment damage and downtime. The Furnas 48FC31AA3 integrates directly into INNOVA starter frames and delivers consistent, predictable protection across standard operating environments.
Key Features
- Class 48 thermal melting alloy design for reliable overload detection
- Three-phase motor protection
- Direct mounting compatibility with Furnas/Siemens INNOVA starters
- Proven thermal technology with field-tested reliability
- Standard contact configuration for motor control circuits
- Used unit fully inspected and tested for functionality
Technical Specifications
- Manufacturer: Furnas Electric (Siemens)
- Part Number: 48FC31AA3
- Type: Melting Alloy Overload Relay
- Class: Class 48
- Phase: 3-phase
- Technology: Thermal melting alloy
- Mounting: INNOVA starter mount
- Contact Type: N.C. overload contact
- Certifications: NEMA, industrial motor control rated
Typical Applications
- Three-phase AC motor overload protection
- INNOVA motor starter protection circuits
- Industrial pump and compressor motor control
- Manufacturing equipment motor circuits
- HVAC and facility automation systems
- Retrofit and replacement installations
Compatibility & Replacements
Compatible With
- Furnas/Siemens INNOVA starters (Size 00–3.5)
- Class 48 motor starter frames
- Standard 3-phase AC motor control circuits
- 480V, 240V, and 120V control systems
Replaces / Drop-In Replacement For
- Furnas 48FC31AA3 original specification
- Similar melting alloy Class 48 relays in identical form factor
Works With
- Furnas/Siemens motor control equipment
- Standard thermal overload heater elements (field-adjustable sizing)
- Industrial motor protection and automation systems
- Pneumatic and electromagnetic motor starters
