Allen-Bradley 815-D0V4 Thermal Overload Relay

Allen-Bradley 815-D0V4 is a manual-reset thermal overload relay (Series K, size 3) designed for NEMA Open mounting in motor starter circuits. It provides motor overload protection when used with compatible Series K contactors, and it carries a single normally closed (1-N.C.) trip contact to interrupt the control circuit on an overload condition. The unit is rated for up to 600V AC and is intended for panel-mounted, open-type starter assemblies, making it a practical option for refurbishing older installations that rely on Allen-Bradley components. The 815-D0V4’s size-3 form factor fits standard starter configurations, and the manual reset requirement ensures an operator can inspect the fault and reset the relay before re-energizing the motor, helping prevent repeated fault conditions. As part of the legacy 815 family used with Series K starters, this relay offers straightforward wiring and dependable protection in control panels that employ traditional Allen-Bradley motor-control hardware.