S2 reversing assembly with built-in varistor
The Siemens 3RA2335-8XE30-1NB3 is a SIRIUS reversing contactor assembly in the S2 frame size, combining two 3RT2035 contactors — one with a varistor surge suppressor (3RT2035-1NB30-0CC0) and one standard (3RT2035-1NB30) — on a common mounting plate. This pre-assembled unit saves panel space and wiring time compared to building a reversing starter from separate contactors and interlocks. The varistor across the coil suppresses switching transients, reducing EMI and extending contact life.
Mounting and wiring constraints
Snaps onto 35 mm standard mounting rail with screw fastening. Dimensions are 141 mm high, 120 mm wide, 130 mm deep. Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm sideways, 10 mm downwards, 0 mm backwards (–). The backwards zero clearance means the assembly can sit flush against the back panel — no extra air gap needed behind the DIN rail. Main circuit terminals accept 2x (1…35 mm²) solid or 1x (1…50 mm²). The coil operates on 20…33 V DC.
Mechanical endurance and environmental range
Typical mechanical life is 10,000,000 operations — sufficient for high-cycle reversing applications like conveyor shuttles or hoist direction changes. Shock resistance is 12g at 5 ms and 7g at 10 ms AC. The substance prohibitance date of 10/01/2014 indicates RoHS compliance from that date forward.