Panel fit and DIN-rail footprint
The 5SY4302-5: Three-pole, 3 MW wide — 54 mm across the face — and 76 mm deep behind the panel. Sealable with a lead or tag to prevent tamper after commissioning.
A-curve trip — what it means for the load
That catches short-circuit faults fast while tolerating the mild inrush of resistive or semiconductor loads. Rated 2 A at 35 °C ambient; derate to 1.9 A at 40 °C, 1.8 A at 50 °C, and 1.7 A at 60 °C.
Breaking capacity and approvals
UL1077 listing means it is accepted as a supplementary protector in North American panels.
Current production stage — no obsolescence notice on record. The 5SY4302-5 is an active SENTRON catalog line, so it is quoted to order against the BOM quantity through independent distribution. No official replacement or cross-reference needed while the part is in active manufacture.