Siemens 48DC39AA4 Overload Relay

Product Description

The SIEMENS 48DC39AA4 is an overload relay designed to protect motors and electrical equipment from sustained overcurrent conditions that can cause overheating and damage. Overload relays monitor current draw in motor circuits and trip the control circuit when current exceeds the set threshold for a defined period. The 48DC39AA4 is installed in motor control panels, starters, and control centers across commercial and industrial electrical systems. Licensed electricians and industrial maintenance technicians are the primary installers of this device.

This overload relay is suited for motor protection applications in commercial and industrial settings. It is typically installed in combination with a contactor as part of a full motor starter assembly. Common applications include HVAC compressor motor controls, pump panels, conveyor systems, and other motor-driven equipment requiring reliable overload protection in low-voltage motor control circuits.

Key Features

• Provides overcurrent protection to prevent motor burnout from sustained overload conditions
• Designed for integration with compatible contactors in motor starter assemblies
• Trips control circuit on thermal or electronic overload detection to interrupt motor operation safely
• Compact form factor suitable for panel and starter mounting

Compatibility

Designed as an OEM-style overload relay for use in low-voltage motor starter and control panel assemblies. Verify contactor and starter compatibility with SIEMENS documentation before installation.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NEC requirements and local electrical codes. De-energize and lock out the panel or motor starter before beginning any work on the overload relay. Verify the current range setting on the relay matches the full-load amperage of the motor being protected. Do not bypass or manually defeat the relay trip mechanism during testing or commissioning.

Technical Specifications

• Weight: 0.904 pounds
• UPC: 78308708413

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 48DC39AA4