1SSS444409R1100 is an auxiliary contact block for ABB contactor and relay series. It is an attachable accessory installed on main contactor side or front to expand extra auxiliary switching points for logic interlock and signal feedback. Original standard production is available, genuine spare and tested refurbished items are supplied for cabinet assembly and field equipment maintenance replacement.

1SSS is fixed part prefix for ABB low voltage auxiliary accessory coding. 444409 stands for base hardware specification of this auxiliary contact unit. Suffix R1100 represents factory standard hardware revision and default contact configuration. Other revised suffix only changes partial internal assembly without altering contact layout and mounting dimension.

Rated operational control voltage AC/DC up to 250V, conforms to standard auxiliary contact capacity of industrial control circuit. Mechanical service life reaches millions of switching cycles. Operating ambient temperature ranges from -20℃ to +60℃, storage temperature -40℃~+85℃, relative humidity 5%~95% non-condensing. Protection grade IP20, certified with CE and IEC industrial standards. Built-in snap-on structure for quick mechanical locking onto corresponding contactor.

Equipped with screw type wiring terminals for external control circuit wiring. No built-in communication port or bus interface, only serves as passive mechanical switching component linked with main contactor moving mechanism. All signal transmission is realized through hardwire connection of external control cable.

Follow the opening and closing action of matched main contactor to realize synchronous on-off of auxiliary contact circuits. Provide isolated switching signal for PLC feedback, indicator lamp driving and equipment interlock control inside control cabinet. Expand available auxiliary points when original contactor built-in contacts are insufficient for system logic design.

Widely used in motor control cabinet, pump and fan control panel, metallurgical auxiliary control and chemical low voltage distribution system, matching ABB standard AC contactors for running status feedback and safety interlock logic.

Cut off full control circuit power before installing or detaching the auxiliary block, wait several minutes for residual voltage release. Regular half-year maintenance cleans terminal dust with dry compressed air and tightens wiring screws. If contact fails to switch synchronously, check mechanical clamping status first before component replacement, avoid overvoltage overload on auxiliary terminals to prevent contact ablation.