Square D By Schneider Electric 1-B5.50 Heater

The Square D by Schneider Electric B5.50 Thermal Unit is a plug-in, melting-alloy overload heater designed to protect motors in Square D starter circuits. Rated up to 600 V AC, it is offered in NEMA Sizes 00 through 7 and can be configured with standard, quick, or slow trip settings to match protection needs. This Type S/Type B thermal unit uses a melting alloy sensing element and is specified as Class 20, delivering reliable, fast interruption during overloads. With approximate dimensions of 4.9 in long, 3.6 in wide, and 0.8 in high, the B5.50 mounts via plug-in engagement in compatible Square D equipment, enabling straightforward installation in industrial control panels. Part of Schneider Electric’s Square D thermal protection line, the B5.50 protects small to mid-size motors, helping prevent damage and downtime in a range of industrial applications.