Overview
The Furnas 958L109441U is a solid state overload relay designed to provide motor protection in industrial control systems. Rated for 22–44 amp operation, this unit delivers Trip Curve A thermal response characteristics for standard motor starting profiles. As a discontinued model, it remains valuable for system maintenance and replacement in existing Furnas motor control architectures where compatibility is critical.
Key Features
- Solid state design for reliable, predictable overcurrent protection
- 22–44 amp current rating with adjustable characteristics
- Trip Curve A response suited to standard induction motor loads
- Compact form factor compatible with Furnas control systems
- Phase loss detection capability on select configurations
- Proven field performance in industrial and commercial motor control applications
Technical Specifications
| Current Rating | 22–44 A, 3-phase |
| Trip Curve | Trip Curve A |
| Relay Type | Solid State Overload |
| Part Number | 958L109441U |
| Manufacturer | Furnas Controls (Siemens) |
| Status | Discontinued (Aug 22, 2011) |
| Applications | 3-phase motor control, industrial automation |
Typical Applications
The Furnas 958L109441U is used in:
- Industrial motor control panels and starters
- Pump and fan motor protection circuits
- Compressor and air handling unit control systems
- Manufacturing equipment and production line motor drives
- HVAC and climate control motor protection
Compatibility & Replacements
Compatible With
- Furnas motor control starters and contactors (Class 8–Size 4)
- Siemens Class 14 magnetic starters (cross-compatible)
- 3-phase AC motor circuits rated 480V and below
- Contactor-based motor soft-starters
- Industrial control systems requiring adjustable overload protection
Replaces / Drop-In Replacement For
- Direct replacement for this legacy model may require integration verification
- Previously installed in Furnas FVNR starters and enclosed control panels from the 1990s–2000s
- Verify compatibility with your system integrator before ordering
Works With
- Furnas magnetic motor starters and soft-starter platforms
- Siemens 3RU and 3RT overload relay families
- Standard 3-phase AC induction motors (squirrel cage)
- Motor control circuits with manual or automatic reset configurations
