This lot of two Square D Overload Relay Thermal Units (model B40) is a great addition to any business or industrial electrical equipment. These relays are designed for overload protection and are made by the trusted brand Square D. The custom bundle is not included with this purchase. The thermal overload relay is a type of relay that is perfect for protecting your electrical equipment from overheating. It is ideal for use in various industries such as manufacturing, industrial, and commercial settings. With this purchase, you can ensure that your electrical equipment is protected from overheating and that your operations are safe and efficient.