Square D thermal overload relay heater element unit B22

Description:

The Square D B22 Thermal Overload Relay Heater Element Unit is a calibrated motor protection component used in Square D thermal overload relay systems. It provides overload protection by converting motor current into heat, which activates a bimetal or melting alloy mechanism to trip the relay when sustained overcurrent conditions occur.

Applications:

The Square D B22 heater element is used in Square D motor starters and thermal overload relay assemblies for industrial motor protection in conveyors, pumps, compressors, HVAC systems, and manufacturing equipment. It is commonly installed in motor control centers (MCCs), OEM panels, and industrial automation systems where accurate thermal overload protection is required based on motor full-load current ratings.

Technical Specifications:

• Manufacturer: Square D (Schneider Electric)
• Model: B22
• Product Type: Thermal Overload Relay Heater Element Unit
• Full Load Current Range: 12.1 – 16.5 A (Grainger) (grainger.com)
• Trip Class: Class 20 thermal protection system
• Overload Type: Melting alloy / bimetal thermal sensing element
• Mounting Type: Plug-in heater element for overload relay base
• Function: Motor overload protection via time-delayed thermal trip mechanism
• Compatibility: Square D Type B / Type S overload relay frames
• Application Environment: Industrial motor control systems and MCC assemblies

Common Replacements:

• Square D B21 Thermal Heater Element
• Schneider Electric LRD Series Thermal Units
• Siemens 3RU11 Thermal Overload Heater Elements