The 500-021R is an Easy 24V relay ideal for use with fire alarm systems. It is supplied in a red plastic housing.
This unit features a built-in diode in series with the coil, which allows easy connection to bell circuits that use EOL resistors.
The relay is of a compact power type. It has two sets of contacts, each capable of switching 8 amps.
On the front of the housing these is a status LED which is designed is provided to visually indicate that the contacts are in the active position.