W34 - Allen-Bradley Thermal Unit Description
W34 - Allen-Bradley Thermal Unit
The Allen-Bradley W34 Thermal Unit is a dependable, NEMA-rated heater element designed to help safeguard electric motors against harmful overloads. Built to work seamlessly with Allen-Bradley Type W overload relays and compatible starters, the W34 is well-known for delivering precise thermal protection. It's calibrated to follow a Class 20 trip curve, meaning it disconnects the circuit within 20 seconds during an overload—reducing the chances of overheating or motor burnout. Whether you're working with automation panels, pumps, or HVAC systems, this component helps maintain uptime and prevent damage caused by prolonged current surges. It's a practical choice for electricians and engineers who value reliability in everyday motor control applications.
Key Features and Benefits
- Overload Protection You Can Count On: Triggers disconnection within 20 seconds under overload conditions, following the Class 20 standard.
- Works Where It Should: Designed to fit Allen-Bradley manual and magnetic starters—easy to install, no surprises.
- Tailored Fit: Choose based on the motor's full-load current (FLC); check OEM selection charts to get the right match.
- Proven Build Quality: Durable construction handles the wear of real-world use in industrial and commercial setups.
- Reliable Performance: Helps extend motor life by minimizing risk from excessive current draw.
Technical Specifications
- Type: NEMA Heater Element
- Trip Class: 20 (approx. 20 seconds to trip during overload)
- Compatibility: Allen-Bradley Type W overload relays and related NEMA motor starters
- Sizing Method: Based on motor's FLC; reference selection charts for best results
Material Compliance and Certifications
- Manufactured to align with original specifications from the OEM
- Built using materials that meet common safety and environmental standards (e.g., RoHS-compliant, where applicable)
Suitability
- Industrial motor panels – Keeps motors safe in manufacturing or heavy-duty machinery.
- HVAC systems – Protects key components like fans and compressors from electrical stress
- Pumps and controls – Ideal for preventing downtime in pumping stations and water systems
- Automation setups – Delivers consistent thermal protection in robotics and conveyor systems
- Everyday installations – Good for any system where NEMA-rated starters are used
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Allen-Bradley® is a registered trademark of Rockwell Automation, Inc. Products sold are surplus, used, or refurbished and are NOT supplied by Rockwell Automation.
Specifications
- Width:1.0
- Height:2.0
- Depth:1.0
- Poles:1
- Amperes:1.8
- Type:W
- Sub-Category:Thermal Unit
- Additional Notes:Type W Thermal Unit for 509 type starter
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