Siemens 3RU21464HB0 Thermal Overload Relay

Product Description

The SIEMENS 3RU21464HB0 is a thermal overload relay designed to protect three-phase motors from damage caused by overcurrent, phase loss, and sustained overload conditions. It monitors current draw continuously and trips the control circuit when the thermal threshold is exceeded, preventing motor winding burnout. This relay is installed in motor starter assemblies and motor control centers in industrial and commercial electrical systems. Licensed electricians and industrial controls technicians are the primary installers. The compact, panel-mount design fits into standard SIEMENS SIRIUS contactor configurations and weighs 1.199 pounds.

The 3RU21464HB0 is suited for use in motor control applications across commercial and industrial facilities where reliable overload protection is required. Typical installations include pump motor starters, conveyor drive panels, HVAC fan motor circuits, and process control enclosures. It is intended for use in three-phase motor circuits within motor control centers, combination starters, or freestanding enclosures.

Key Features

• Thermal overload protection guards against overcurrent and phase-loss conditions
• Compact form factor at 5.118 inches x 3.071 inches x 4.488 inches for panel-efficient installation
• Lightweight construction at 1.199 pounds for easy handling during installation
• Designed for integration into motor starter assemblies and motor control centers
• Manual or automatic reset capability typical of this relay class

Compatibility

Designed as an OEM-style replacement thermal overload relay for use in SIEMENS SIRIUS motor starter and motor control center assemblies where this part number is specified.

Installation Notes

Installation should be performed by a licensed electrician following applicable NEC requirements for motor branch circuit and overload protection. Disconnect and lock out all power to the motor control panel before removing or installing the relay. Verify current range settings match the full-load amperage of the protected motor before energizing. Do not bypass or jumper the overload relay contacts during commissioning.

Technical Specifications

• Weight: 1.199 pounds
• Length: 5.118 inches
• Width: 3.071 inches
• Height: 4.488 inches
• UPC: 80476635935
• Quantity per Pack: 1

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 3RU21464HB0