Overview
The Square D B40 thermal heater element is a replacement heater unit designed for use in thermal overload relays, magnetic motor starters, and motor control systems. This lot contains 6 new-in-box units, each engineered with melting-alloy sensing technology to provide dependable motor protection in industrial applications. Square D thermal heater elements are industry-standard components trusted by maintenance technicians and system integrators for their precision and reliability.
Key Features
- Melting-alloy sensing method for accurate thermal detection
- Plug-in mounting design for quick installation and replacement
- Standard trip characteristic for consistent motor protection
- Compatible with thermal overload relays and motor starters
- Rated for 600V AC applications
Technical Specifications
- Part Number: B40 / B40.0
- Manufacturer: Square D (Schneider Electric)
- Type: Thermal Overload Heater Element
- Current Rating (1 TU): 27.2–29.2 Amps
- Current Rating (3 TU): 21.8–24.2 Amps
- Voltage Rating: 600V AC
- Sensing Method: Melting Alloy
- Mounting Style: Plug-in
- Trip Type: Standard
- Quantity: 6 units per lot
Typical Applications
- Motor protection circuits in industrial machinery
- HVAC and refrigeration compressor protection
- Pump and fan motor overload safeguarding
- Manufacturing equipment motor starters
- Air compressor protection systems
Compatibility & Replacements
Compatible With
- Square D thermal overload relays
- Magnetic motor starters with thermal overload protection
- Motor control centers using melting-alloy heater technology
- General-purpose motor control applications
Replaces / Drop-In Replacement For
- OEM Square D B40 thermal heater units
- Legacy Square D B-40 overload heater cartridges
- Original equipment manufacturer B40.0 thermal elements
Works With
- 600V AC motor control systems
- Thermal overload relay assemblies
- Plug-in heater cartridge slots in motor starters
- Manual and automatic reset overload relay configurations
