The Siemens 3RT1336-1AG20 is a SIRIUS S2 power contactor — the S2 frame size slots it between the compact S0 and the larger S3, so it handles motor loads up to 23 kW at 230 V 60 °C and 11 kW under AC-2 duty at 400 V. Insulation voltage is rated 690 V, which covers 400 V line-to-line with headroom for surge coordination.
Mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 50022 — the S2 footprint is 73 mm wide, 112 mm tall, 115 mm deep, so it fits a standard 200 mm deep enclosure with room for wiring gutters. IP20 on the front, IP00 at the terminals — panel builders should keep live parts behind a door or cover.
Main circuit terminals accept solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Minimum permissible cross-section at both 40 °C and 60 °C is 16 mm² for the main circuit — that's the thermal derating floor for continuous current.