Description
Siemens 75D73251A Overload Relay — NEMA Size 3+3.5
The Siemens 75D73251A is a heavy-duty overload relay engineered to deliver dependable motor protection in demanding commercial and industrial HVAC applications. Designed for use with NEMA Size 3 and Size 3.5 motor starters, this unit provides reliable overcurrent protection to safeguard motors, contactors, and associated electrical equipment from damaging overload conditions.
Voltage & Compatibility
- Dual voltage rating: 110-120V / 220-240V for flexible installation across single- and multi-voltage systems
- Compatible with NEMA Size 3 and Size 3.5 motor starters and contactors
- Designed for integration into commercial HVAC, refrigeration, and industrial motor control applications
Key Features
- Siemens quality construction for long service life and consistent performance
- Overload protection helps prevent motor burnout and costly equipment downtime
- NEMA-rated design for compatibility with standard North American motor control equipment
- Dual voltage capability simplifies stocking and installation across varied voltage environments
- Suitable for use in motor control centers (MCCs), panel boards, and standalone starter assemblies
Application
The 75D73251A is well-suited for protecting three-phase and single-phase motors in commercial HVAC systems, including air handling units, chillers, cooling towers, pump systems, and compressor applications where reliable overload protection is critical.
Why Choose Siemens?
Siemens is a globally recognized leader in electrical control and automation equipment. Their motor protection and starter components are trusted by HVAC contractors, mechanical engineers, and facility managers for consistent reliability, broad compatibility, and adherence to industry standards.
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