The override switch really comes in handy when you need to test the system or reset things in a hurry.
New RIB Lighting Controls ESR2402D Emergency Lighting Relay. Missing Few Parts.
this particular relay carries the Functional Devices, Inc. name, which many electricians trust for daily work.
It uses a programmable timer, so you can set delays that fit your needs.
What stands out about this relay is the override switch, and it feels reassuring to have that option nearby.