Square D B40.0 Thermal Overload Relay Unit, 21.9-31.7A

The Square D B40.0 thermal overload relay unit provides reliable motor overload protection for industrial and commercial applications. This thermal unit is designed to protect motors from damage caused by overload conditions, automatically tripping when current exceeds safe operating levels.

Key Features:

• Current range: 21.9 to 31.7 amperes
• 40A overload relay thermal unit design
• Manufactured by Schneider Electric under the trusted Square D brand
• Thermal sensing technology for accurate overload detection
• Easy installation and replacement in compatible overload relays
• Designed for three-phase motor protection applications

This thermal unit is a replacement component for Square D overload relays, providing precise trip characteristics matched to specific motor current requirements. The thermal element heats in proportion to motor current, ensuring accurate protection while minimizing nuisance tripping.