The Siemens 3RT1336-1AL20 is a SIRIUS-brand power contactor in size S2, rated to switch motor loads up to 23 kW at 230 V 50/60 Hz and 11 kW at 400 V AC-2 duty.
The 23 kW at 230 V rating (at 60 °C ambient) tells you this contactor is sized for a 30 hp motor on a 230 V three-phase line — common in North American 230 V delta systems. AC-2 duty means it's rated for starting and stopping slip-ring motors or other loads with moderate inrush; for standard squirrel-cage motors, you'd typically use the AC-3 rating (not listed here, so verify against your motor's starting current). The screw-type terminals accept solid wire up to 4 mm² (2x) and stranded up to 25 mm² (2x), covering most motor power feeds up to 23 kW.
The 73 mm width, 112 mm height, and 115 mm depth fit the S2 footprint. Side-by-side mounting is permitted.
The substance prohibitance date of 05/01/2012 indicates RoHS compliance from that date forward. The 690 V insulation voltage rating and pollution degree 3 align with IEC 60947-4-1 requirements for contactors. No specific UL or CSA listing is in the evidence, but the SIRIUS series typically carries these approvals — verify against your local code requirements.