H2021-3 - Eaton Thermal Unit

H2021-3 - Eaton Thermal Unit

Protect your motor circuits with precision — the Eaton H2021‑3 heater (thermal) unit delivers reliable overload protection in a compact form. Designed for motor starters in industrial and commercial systems, this heater coil operates across a full‑load current range from 45.7 A to 62.1 A, making it ideal for systems demanding accurate thermal protection.

While compact, the H2021‑3 is engineered to safeguard your motors from overheating or current surges. Whether you're building a motor starter package, retrofitting an existing control panel, or upgrading your protection modules, this heater unit slips into NEMA Size 3–4 (IEC Sizes L–N, Series A) motor starters with ease.

Key Features and Benefits

• Wide adjustment range: Supports 45.7 A to 62.1 A — giving you flexibility to match a variety of motor loads.
• Standard (class 20) trip response: Offers a predictable and safe thermal response suitable for many motor protection applications.
• Compact form factor: At approximately 3.3″ height × 2.4″ width × 2.0″ depth (0.25 lb), it fits tight starter enclosures.
• Simple installation: Designed for plug‑in replacement in Freedom / NEMA starter frames — cuts downtime on service or upgrade.
• Improved system safety: Quickly interrupts thermal overload, helping prevent motor winding damage, insulation breakdown, or downstream wiring faults.

Technical Specifications

• Part Number: H2021‑3
• Type: Thermal / Heater (Overload) Unit
• Full‑Load Current Range: 45.7 A to 62.1 A
• Trip Class: Standard (Class 20)
• Compatible Starter Sizes: NEMA Size 3–4, IEC Sizes L–N (Series A)
• Dimensions (H × W × D): ~3.3 in × 2.4 in × 2.0 in
• Weight: ~0.25 lb
• Certifications: UL Listed, CSA Certified (verify label on unit for exact version)
• Packaging / Shipping: Typically shipped in multiples (e.g. 3‑packs)

Material Compliance and Certifications

• Every H2021‑3 heater unit is manufactured to rigorous safety and quality standards. The materials — including flame‑resistant plastics, high‑grade copper or alloy internal conductors, and solid contacts — are selected to handle thermal stress and electrical loads reliably. Where applicable, each unit carries UL and CSA markings, signaling compliance with North American safety norms.
• Though Eaton does not always advertise formal RoHS status for this part, many modern versions are designed to meet environmental restrictions on hazardous substances. Check the label or datasheet at purchase to confirm compliance in your jurisdiction.

Where It Works Best

• Use the H2021‑3 heater unit wherever you need precise protection for medium‑sized motors—especially in control panels, motor starter assemblies, or automation racks. Common application areas include:
• Conveyor drives, pumps, fans
• HVAC systems
• Manufacturing machinery
• Food & beverage processing lines
• Retrofitting existing motor starters when space is limited
• Because of its compact dimensions and flexible current range, this heater unit excels in control systems where space is at a premium and reliability is nonnegotiable.