Modular, for 35 mm DIN rails.
Finder 20A Modular Relays DIN Rail Mounting - Finder 22.21.8.024.4000, This modular, DIN rail mounting 20A relay has a 24V AC coil with SPST-NO contacts. Finder 22.21.8.024.4000 Monostable Modular Relay SPST-NO 24VAC 20A