Product Introduction
The Siemens 3RU7136-4AB0 is a SIRIUS thermal overload relay, Size S2, designed for motor protection in industrial control panels. It provides Class 10 trip protection for three-phase AC/DC main circuits up to 690 V, with a rated operational current of 16 A. The relay mounts directly to a contactor and uses screw-type terminals for both main and auxiliary circuits, with an IP20 rating on the front face.
Key Ratings and What They Mean for Your BOM
The total typical power loss is 10.5 W at rated current in hot operating state — factor this into panel thermal calculations, especially in sealed enclosures. The relay is rated for an operating temperature range of -20 to +55 °C and 0–90% relative humidity, covering most indoor industrial environments.
Mounting and Installation
Mounts directly to a Siemens S2 contactor — no separate base required. The mounting position allows ±135° rotation and ±45° tilt front/back from vertical. Side spacing to grounded parts must be at least 6 mm. Screw terminals for main circuit accept 2x (0.5–1.5 mm²) or 2x (0.75–2.5 mm²) solid/stranded wire; torque to 3–4.5 N·m. Auxiliary contact terminals torque to 0.8–1.2 N·m.