SQUARE D Thermal Unit: 20 Trip Class, A5.78
SQUARE Electrical.
SKU 3G-OTH-40429
Also listed as: A578 · A5 78 · A5-78
Local availability & support
- Delivery
- Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
- Payment
- Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.
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Product Description
SQUARE Electrical.
Frequently Asked Questions
What is the SQUARE D Thermal Unit A5.78 used for?
The SQUARE D Thermal Unit A5.78 is an overload protection device used in motor starters and contactors. It protects electric motors from damage due to prolonged overcurrent conditions by heating a bimetal strip that trips the circuit. Common applications include industrial machinery, conveyors, pumps, and HVAC systems.
What are the specifications of the SQUARE D Thermal Unit A5.78?
The SQUARE D Thermal Unit A5.78 has a trip class of 20 and a manufacturer part number of A5.78. It is designed for use with SQUARE D motor starters and contactors. The trip class indicates the maximum time in seconds the unit can withstand a locked-rotor current before tripping.
Where to buy the SQUARE D Thermal Unit A5.78 worldwide?
You can source the SQUARE D Thermal Unit A5.78 through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact our team for pricing 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 motor's full-load current (FLC) to the unit's ampere rating range. The trip class (e.g., 20) must suit the motor's starting characteristics. Always consult the motor nameplate and SQUARE D selection tables to ensure proper overload protection without nuisance tripping.
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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.
