A4.32 - Square D Thermal Unit

A4.32  - Square D Thermal Unit

The A4.32 Square D Thermal Unit is a precision-engineered overload protection device designed to guard electric motors and motor starters from prolonged overcurrent and heat damage. Crafted with a high-quality melting‑alloy mechanism, this compact thermal protector meets Class 20 tripping standards—ensuring a rapid response under overload conditions—making it perfect for demanding industrial and commercial settings. With a rugged one‑piece design and compatibility with NEMA sizes 00 to 7, this unit supports AC systems up to 600 V, delivering trusted performance wherever reliable motor safeguarding is essential.

Key Features and Benefits

• Class 20 fast‑acting trip: Activates within 20 seconds under overload to protect against overheating, locked rotor, and damage.
• Melting‑alloy, heat‑activated mechanism: Smart, self‑resetting design ensures accurate response without complex circuitry.
• One‑piece rugged construction: Simple to install and built to last, reducing downtime and maintenance costs.
• Broad compatibility: Designed for NEMA Sizes 00–7, it integrates seamlessly with most motor starter and overload relay systems.
• High voltage capacity (up to 600 V AC): Versatile enough for heavy industrial lines and commercial operations.

Technical Specifications

• Type: Thermal Overload Unit
• Overload Mechanism: Melting Alloy
• Trip Class: Class 20 (≤ 20 seconds)
• Voltage Rating: Up to 600 V AC
• Dimensions: 2.28″ × 1.10″ × 0.79″ (L×W×H)
• Weight: Approx. 0.6 oz (18 g)
• Warranty: 18 months

Material Compliance and Certifications

• Meets UL assembly standards (refer to manufacturer datasheet for full certification listings)
• Durable internal heater coil and alloy materials designed for consistent thermal performance
• Packaging not recycled, ensuring protection during shipping while conveying product integrity

Suitability

• Ideal for electrical maintenance technicians, HVAC professionals, and automation integrators who manage motor loads that frequently start, stop, or experience overload.
• Pair it with NEMA-rated motor starters and overload relays in industries spanning manufacturing, HVAC systems, pumping applications, and more.
• Provides rapid, reliable thermal protection in high-stress environments prone to heat and overcurrent events.