The Square D B7.70 Overload Relay Thermal Unit is a 1‑piece component featuring a heater element rated 5.3–5.73 A. It is designed for use with Square D's B7.70 overload relay system and provides the thermal sensing element required for overload protection. With a heater-element rating of 5.3–5.73 A, this unit specifies the current range at which protection activates.
