You will find that the 4 Pack makes it simple to replace relays across several devices.
SIEMENS REYROLLE ARGUS 1 DCD415A 2434H6415A PROTECTION HEALTHY 110-220V
What stands out about this device is that it is a protection relay, giving you extra confidence in everyday use.
A nice touch is that the Formiden brand sits clearly on the unit, aiding quick recognition.