Thermal overload relay JR28-40 - Function and purpose Provides motor protection by monitoring current and triggering a control action in the drive circuit. The relay uses one normally open (NO) and one normally closed (NC) auxiliary contact to integrate with a contactor for reliable overload shutdown. - Model and electrical ratings Model: JR28-40 Nominal current: 80 A Adjustable current setting: 63–80 A Thermal nominal current: 80 A Contact configuration: 1 normally open, 1 normally closed - Physical size Enclosure size: approx 116 x 70 x 78 mm (L x W x D); 4.6 x 2.8 x 3.1 in - Why you need it - Protects motors from overload conditions to prevent overheating and damage - Adjustable setpoint aligns with motor full load current for accurate protection - Compact form factor fits standard control panels and control circuits - Practical applications - Industrial conveyor systems: protect a 3-phase motor by tripping the control circuit if current exceeds the set threshold - Pumps and fans: guard motor health by monitoring load and triggering a safe shutdown when overcurrent is detected - Machinery and packaging lines: integrate with a contactor to provide automatic overload protection and improved uptime - Compatibility and performance Designed for use with compatible motor control circuits and contactors in motor protection applications, offering reliable protection with a compact, well-defined interface.