Amazon.com: Aiposen 110V/220V AC to DC 24V 5A 120W Switch Power Supply Driver,Power Transformer for CCTV Camera/ Security System/ LED Strip Light/Radio/Computer Project(24V 5A) : Cell Phones & Accessories
Eaton / Moeller DILA-40 4 pole control relay with a 24 volt AC coil. Comes with 4 N.O. base contacts, rated for 16 AMPS and mounts on standard 35mm DIN rail: Amazon.com: Industrial & Scientific
220V 240V Relay, Briidea On/Off Switch Electric Heating Relay with Built-in 24V Transformer, Replacement for Any Relay, Compatible with 24V Thermostat - - Amazon.com