Square D 9065SDO15 Thermal Nema Overload Relay

Product Description

The SQUARE D 9065SDO15 is a thermal NEMA overload relay rated for NEMA Size 4 applications at up to 600 volts AC. It provides motor overload protection by sensing heat buildup caused by excessive current draw, tripping the circuit before damage occurs to the motor or connected equipment. The thermal sensing method responds to sustained overload conditions and phase-loss scenarios common in industrial motor control applications. Electricians and industrial controls technicians install this relay as part of a motor starter assembly, typically mounted within a motor control center or enclosed starter panel.

This overload relay is suited for commercial and industrial motor control circuits where NEMA-rated starters are specified. NEMA Size 4 starters handle larger horsepower motors found in pumping systems, compressors, conveyor drives, and HVAC equipment in commercial buildings. The 600-volt rating covers standard three-phase distribution voltages used throughout industrial and commercial facilities. It is intended for use in fixed or combination starter configurations where thermal overload protection is required by code or system design.

Key Features

• Thermal sensing method detects sustained overload and phase-loss conditions
• NEMA Size 4 rating for larger horsepower motor starter applications
• 600 VAC rating compatible with standard three-phase industrial voltages
• Designed as a direct replacement component for motor starter assemblies
• Compact form factor at 8.5 inches length by 6.6 inches width by 6.3 inches height

Compatibility

Designed as an OEM-style replacement thermal overload relay for NEMA Size 4 motor starter assemblies rated at 600 volts AC.

Installation Notes

Installation should be performed by a licensed electrician following applicable NEC requirements and local codes. De-energize and lockout/tagout the motor control panel before removing or installing this relay. Verify the replacement relay matches the heater element sizing and NEMA size of the existing starter. Do not energize the circuit until all connections are secure and the enclosure is properly closed.