What the D-curve means for your BOM
The 5SY4210-8: This is a 2-pole design with no neutral switching. The housing is sealable, halogen-free, and silicon-free, which matters for clean-room or corrosive environments. Pollution degree 3 and overvoltage category III confirm it's rated for industrial fixed installations. The breaker occupies 2 modular width units with a width of 36 mm and depth of 76 mm. Mounting position is any, and the quick assembly system clips onto standard DIN rail.
Lifecycle and sourcing reality
Compliance documents are straightforward: the base standards are IEC/EN 60898-1, IEC/EN 60947-2, and UL 1077. The breaker is halogen-free and silicon-free, so RoHS and REACH declarations are standard. An ambient temperature matrix covers –40 °C to 75 °C with humidity derating.
Panel fit and coordination
The 76 mm depth and 70 mm installation depth fit standard distribution enclosures. Terminal design allows supply from either top or bottom.