What this reversing contactor assembly delivers
The Siemens 3RA2318-8XE30-2BB4 is a SIRIUS reversing contactor assembly — a pre-assembled pair of contactors with mechanical interlock, sized S00, that swaps motor phase rotation for forward/reverse control of a three-phase induction motor. The assembly ships with two 3RT2018 contactors and the 3RA2913-2AA2 reversing kit — a matched set that saves panel wiring time and avoids interlock alignment issues.
Termination and mounting — panel-fit constraints
Dimensions are 90 mm wide, 68 mm high, 73 mm deep. Clearance around the unit: 6 mm upwards, forwards, downwards, and to the side; 0 mm backwards (–) — meaning it can sit flush against the backplane.
Environmental and compliance envelope
Operates from -25 to +60 °C and stores from -55 to +80 °C — suitable for unheated enclosures in temperate climates. Vibration resistance: 11.4 g / 5 ms and 7.3 g / 10 ms on both AC and DC coils — the higher g-rating at the shorter pulse reflects the contact bounce tolerance during a shock event. RoHS compliance date listed as 10/01/2009 — the assembly meets the EU RoHS substance restrictions effective from that date.