The 1 A rating holds at 35 °C ambient. Above that, the thermal-magnetic trip element derates: 0.92 A at 40 °C, 0.88 A at 45 °C, 0.83 A at 50 °C, and 0.78 A at 55 °C. If your panel runs warm — say 50 °C inside a sealed enclosure — you're actually getting an 0.83 A breaker. Size up one frame if the load is near the nominal rating.
Combined terminal top and bottom accept the same wire range. Touch protection is built in. The breaker is sealable (tamper-proof with a lead seal) and halogen-free / silicon-free — relevant for clean-room or corrosive-gas environments. Humidity limits are specified per the temperature band: max 95% RH up to 55 °C, derating to 35% at 75 °C.