SQUARE D Thermal Unit: 20 Trip Class, A21.3
SQUARE Electrical.
SKU 3G-OTH-41122
Also listed as: A213 · A21 3 · A21-3
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 A21.3 used for?
The SQUARE D Thermal Unit A21.3 is an overload protection device used in motor starters and contactors. It protects electric motors from damage due to overload conditions by sensing current and tripping the circuit. Common in industrial automation, HVAC, and pump systems.
What are the specifications of the SQUARE D Thermal Unit A21.3?
The SQUARE D Thermal Unit A21.3 has a trip class of 20 and a manufacturer part number A21.3. It is designed for use with SQUARE D motor starters. Trip class 20 means it will trip within 20 seconds at 600% of rated current, providing standard motor overload protection.
Where to buy SQUARE D Thermal Unit A21.3 worldwide?
You can source the SQUARE D Thermal Unit A21.3 through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time.
How to select the correct SQUARE D thermal unit for a motor?
Select the SQUARE D thermal unit based on the motor's full-load current (FLA) and ambient temperature. The A21.3 is a trip class 20 unit, suitable for standard motor starting. Always match the thermal unit's current rating to the motor nameplate FLA, and consult the SQUARE D selection table 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.
