The Siemens 3RU7136-4JB0 is a SIRIUS S2-size thermal overload relay rated for 65 A operational current at 690 V AC/DC, with a Class 10 trip characteristic. It mounts directly onto a S2 contactor — no separate DIN-rail bracket needed — and the 118 mm depth, 55 mm width, 105 mm height footprint keeps the panel layout tight. The screw-type terminals on both main and auxiliary circuits accept 2x (0.5...1.5 mm²) solid or stranded, or 2x (0.75...2.5 mm²) with ferrules.
What the ratings mean for fit
The 65 A rated operational current is the continuous motor FLA this relay can carry and protect — match it to the motor nameplate, not the contactor rating. Class 10 trip means it opens within 10 seconds at 7.2× set current, standard for standard-duty induction motors starting under load. The 690 V rated voltage covers 400 V and 480 V systems with headroom. Power dissipation runs 17.1 W total typical at rated current — account for that heat inside the enclosure, especially when ganged with the contactor.
Mounting and integration
Fastening method is contactor mounting — the relay clips directly onto a SIRIUS S2 contactor, no DIN rail required. Mounting position allows vertical surface with ±135° rotation or ±45° tilt forward/back. Required side spacing to grounded parts is 6 mm. The front face carries IP20 protection; the terminal area is IP00 — keep live parts behind a panel door or cover.