It offers a thermal protection adjustment range of 30 to 40 A and is rated Class 10A per IEC 60947-4-1, meaning it will trip within 10 seconds at 7.2× the current setting — fast enough to protect standard induction motors during a locked-rotor event.
The 30...40 A adjustment range covers motor FLA in that band; the relay is mounted directly under a TeSys D or TeSys Deca contactor, so the assembly fits a standard DIN-rail footprint. The Class 10A tripping class matches most general-purpose motor starting applications — pumps, fans, conveyors — where the starting time is under 10 seconds. Phase failure sensitivity triggers a trip at 130% of Ir on two phases when the third drops to zero, which is the standard requirement for preventing single-phasing damage. The 1 NO + 1 NC auxiliary contact composition gives one normally-open signal for the PLC and one normally-closed for the safety chain, a common arrangement in motor control centers.
The LR3D3406 carries approvals to EN/IEC 60947-4-1, UL 60947-4-1, CSA C22.2 No 60947-4-1, and GB/T 14048.4, so it is accepted in North American, European, and Chinese installations. The IP20 degree of protection means it is touch-safe for panel installation but not rated for washdown environments. The flame retardance rating is V1 per UL 94.