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Frequently Asked Questions
What is the SQUARE D B12.8 thermal unit used for?
The SQUARE D B12.8 thermal unit is an overload relay heater element designed for motor protection in industrial electrical panels. It provides Class 20 trip protection, meaning it delays tripping on startup to accommodate inrush current while safeguarding motors from sustained overloads.
What are the specifications of the SQUARE D B12.8 thermal unit?
The SQUARE D B12.8 thermal unit has manufacturer part number B12.8 and is rated for Class 20 trip protection. It is a bimetallic overload relay heater element used with SQUARE D motor starters. The B12.8 designation indicates its specific current range for matching motor full-load amps.
Where to buy SQUARE D B12.8 thermal units worldwide?
3G Electric supplies the SQUARE D B12.8 thermal unit to customers worldwide. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time on this part.
How to select the correct SQUARE D thermal unit for a motor?
To select the correct SQUARE D thermal unit, match the heater element's trip class and current rating to your motor's full-load amps and starting characteristics. The B12.8 is a Class 20 unit, suitable for standard motor starts. Always consult the motor nameplate and SQUARE D selection tables for proper sizing.
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3G Electric supplies SQUARE electrical. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.
