Ratings and environment
The 5SY4203-8: Rated operational voltage is 400 V AC single-phase or 440 V AC multi-phase; DC rating is 60 V (72 V max). The breaker handles 50/60 Hz networks and carries pollution degree 3 and overvoltage category III, which is expected for fixed industrial installations. Ambient temperature range is -40 to 75 °C, with constraints on relative humidity: 95% up to 55 °C, derating to 35% at 75 °C. Vibration resistance per IEC 60068-2-6 is ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz. The enclosure is rated IP20 with conductors connected, halogen-free and silicon-free. The 2-pole breaker occupies two modular width units (36 mm wide) and can be mounted in any position using the quick assembly system.
Dimensions and panel fit
Overall dimensions: height 90 mm, width 36 mm, depth 76 mm. Installation depth is 70 mm. The combined terminal at top and bottom accepts conductors for easy ring or fork lug connections. Sealable with a locking device to prevent unauthorized switching.
Sourcing
This breaker is a current-production item (lifecycle stage: current). Sourced to order against an RFQ; typical lead time depends on quantity and distributor channel availability. No last-time-buy or successor notice applies.