The Siemens 3RF3125-1AA04 is a 1-pole solid-state relay from the SIRIUS 3RF31 family, housed in a 22.5 mm wide package with screw terminals. It is rated for 25 A continuous current across a 48-460 VAC load voltage range, switched by a 24 VDC control input.
The 104 x 44 x 48 mm package dimensions (L x W x H) allow side-by-side mounting without forced air in most enclosed panels, provided the total heat dissipation of adjacent devices is considered. For continuous 25 A load, verify the terminal temperature rise stays within the device's rated ambient limit of typically 60°C (per the SIRIUS 3RF31 technical manual).