Square D B0.63 Contactor Thermal Overload Unit

Product Description

The SQUARE D B0.63 is a thermal overload unit designed as an accessory for compatible contactors in motor control and electrical protection applications. It provides overcurrent protection by responding to heat generated by excessive current draw, helping prevent motor burnout and equipment damage. Measuring 2.5 inches in length, 1.2 inches in width, and 0.8 inches in height, the B0.63 is a compact replacement component weighing 0.04 pounds. It is installed by licensed electricians and industrial maintenance technicians as part of motor starter assemblies in commercial and light industrial settings.

The B0.63 thermal unit is suited for use in motor starter and contactor assemblies where overload protection is required. Typical applications include HVAC compressor motor starters, pump motor controls, and general-purpose industrial motor control centers. It is a direct-replacement accessory component, packaged individually for single-unit service calls or panel retrofits.

Key Features

• Thermal overload protection for contactor-based motor starter assemblies
• Compact form factor: 2.5 x 1.2 x 0.8 inches for space-constrained enclosures
• Lightweight at 0.04 pounds for easy handling during installation
• Single-unit packaging supports one-for-one field replacement
• OEM-style accessory designed to fit contactor assemblies requiring thermal unit components

Compatibility

Designed as an OEM-style replacement thermal unit for SQUARE D contactor and motor starter assemblies that accept B-series thermal overload elements.

Installation Notes

Thermal overload units should be installed by a qualified electrician in accordance with NEC guidelines and local electrical codes. De-energize and lock out the control panel before removing or installing any contactor accessory. Verify the thermal unit rating matches the full-load amperage of the motor being protected before reinstalling the assembly. Do not bypass or substitute thermal units with unrated components.