The Siemens 3RB2026-2PB0 is a SIRIUS solid-state overload relay rated CLASS 20E, designed for contactor mounting. Rated for AC-3 duty up to 690 V, this relay handles the main current circuit via screw terminals accepting 0.5–4 mm² solid or 2× (0.5–2.5 mm²) stranded. The auxiliary contact block carries 2 A at 24 V, 4 A at 120 V, and 3 A at 230 V — enough for direct PLC input or contactor coil feedback on a standard 24 VDC control loop. Mounts directly onto a Siemens contactor — no DIN rail needed — saving panel width. The 45 mm wide, 73 mm tall, 75 mm deep footprint fits tight enclosures where every millimeter counts.
ATEX certified PTB 06 ATEX 3001 Ex II (2) GD. IP20 front protection. Withstands 15g / 11 ms shock — rated for industrial machinery vibration. Pollution degree 3 rated at 690 V, meaning it handles conductive contamination environments typical of factory floors. EMC immunity includes 2 kV burst on power ports per IEC 61000-4-4, severity level 3. Surge voltage resistance rated 6 kV. Reference code F per DIN EN 81346-2 (protective device).
Wiring & Integration
Solid wire range 0.5–4 mm²; stranded with ferrule 2× (0.5–2.5 mm²). Strip length per standard practice — no special tooling needed. Mounting position any, with 0 mm clearance required upwards, forwards, backwards, and downwards. Side clearance 6 mm. This zero-gap on four sides means the relay can pack tight against other components without derating. Power dissipation at AC in hot operating state: 0.05 W total, 0.02 W per pole. Minimal heat output keeps enclosure temperature rise low — no forced cooling required for the relay itself.