The Siemens 3RF2310-1BA22 is a SIRIUS single-phase solid-state contactor rated 10.5 A in AC-51 duty (resistive load) per IEC 60947-4-3, with a UL 508 rating of 6 A. It switches instantaneously — ON and OFF delays are 40 ms, plus at most one half-wave on turn-off — so it's suited for resistive heater banks or lighting where zero-cross switching isn't required. Side-by-side mounting is allowed, but derate above 40 °C ambient. The single-phase design means one unit controls one line; for three-phase loads you stack three units or use a three-phase SSR. Terminal capacity: solid/stranded up to 6 mm² (AWG 10) for the main circuit, with a second pair for 0.5–2.5 mm² control wiring.
Compliance documentation includes RoHS conformity with a substance prohibition date of 28.05.2009 (RoHS 1). The part carries a UL 508 rating (6 A) and is designed to IEC 60947-4-3. Pollution degree 3 for industrial environments. No REACH or UKCA specific entries are in the record, but the standard Siemens declaration covers EU and UK markets.
The 22.5 mm width is one standard module; plan for 88 mm depth clearance behind the panel door. Screw terminals accept ferruled stranded or solid wire; torque to the values in the datasheet (not repeated here). Fuse coordination: the manufacturer recommends NH fuse size 3NA6803 or NEOZED 5SE2306 (note: the NEOZED has a lower rated current than the relay — size it for conductor protection, not the load). The I²t withstand is 200 A²s, so a fast semiconductor fuse is appropriate for short-circuit protection.