Free UPS Ground on All Orders!
Request a
Fast Quote
Account
Cart
Quote
+1 (919) 205-4392
Allen Bradley 592 Overload Relays W78

Product image is representative; revision or series may vary. Contact us to request a specific version.

W78

|
Need a Specific Revision?

The Allen Bradley W78 is a NEMA overload relay heater that provides thermal protection in motor control applications. This component is compatible with Bulletin 500 line starters and supports effective protection for two sizes, ensuring safety and reliability.

In Stock
Ships from Raleigh, NC
2 Year DO Supply Warranty
Not an Authorized Distributor: DO Supply is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All of our products come with DO Supply's 2-year warranty.
Learn more
Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for W78

ManufacturerAllen Bradley
Product TypeNEMA Overload Relay Heater Element
Product Line592 Overload Relays
Part NumberW78
UPC781180512933
Weight2.00 lbs (0.91 kg)
MaterialEutectic Alloy
Compatible StartersBulletin 500 Line Starters
Protection ClassClass 20
Size CompatibilitySize 3 (FLA 98), Size 4 (FLA 108)
ApplicationThermal Protection for Motor Control
Current Rating at Size 398 Amps
Current Rating at Size 4108 Amps
Ambient Controller Temperature104 degrees Fahrenheit
Ambient Motor Temperature104 degrees Fahrenheit
Request a Repair

The W78, part of Allen Bradley's 592 series of overload relay heater elements, is crucial for establishing thermal protection in motor operation. Crafted from eutectic alloy, it can withstand harsh conditions and impart robust functionality and resilience.

This heater element integrates seamlessly with Bulletin 500 line starters, ensuring compatibility for effective overload protection. It is available in two sizes: Size 3 with a full load current of 98 Amps and Size 4 rated for 108 Amps. The unit adheres to a protection class of Class 20, which delineates its appropriateness for various motor control applications, primarily focusing on safeguarding against overheating due to excessive currents.

The heater element's operational capacity extends to an ambient controller temperature and motor temperature range of 104 degrees Fahrenheit, promoting reliability in typical industrial environments. The W78 overload relay heater is specifically engineered to ensure enhanced safety measures and is essential for protecting motors in dynamic working conditions.