Overview
The Square D 785901 58537 KR overload relay thermal unit is a thermal sensing element designed to protect motors from overload conditions. This A6.20 rated thermal unit is suitable for use in motor control circuits where protection against sustained overloads is required. Square D thermal units provide accurate trip current ratings to prevent motor damage and reduce costly electrical failures.
Key Features
- Thermal sensing technology for accurate overload detection
- A6.20 thermal rating provides specific protection characteristics
- Engineered for use in Square D motor starters and control systems
- Helps prevent motor damage from sustained overloads and reduces downtime
- Trip current rating between 101% and 125% of full load current for standard motors
Technical Specifications
- Part Number: 785901
- Thermal Rating: A6.20
- Type: Overload Relay Thermal Unit
- Manufacturer: Square D
- Condition: New in Box
- Typical Application: Motor protection in 60 Hz three-phase systems
- Trip Current Range: 101–125% of full load current (nominal)
Typical Applications
The Square D 785901 thermal unit is used in motor control and protection systems including:
- Magnetic motor starters and contactors
- Three-phase motor protection circuits
- Industrial machinery and equipment control
- NEMA and IEC-compliant motor control panels
- Facility motor management and protection
Compatibility & Replacements
Compatible With
- Square D magnetic starters (Class 8536, 8904, and similar series)
- Square D motor control centers (MCCs)
- Square D three-phase motor control equipment
- Standard NEMA-configured motor protection circuits
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The A6.20 thermal rating is specific; ensure replacement units match the original thermal unit designation to maintain proper overload protection.
Works With
- Square D motor starters and control devices
- Standard three-phase motor circuits (60 Hz)
- NEMA ICS 2 and ICS 6 compliant systems
- Industrial panel-mounted motor control systems
