The D4E-1B20N is a compact, sealed limit switch from the D4E family configured with a cross-roller plunger actuator and screw-terminal wiring. It provides SPDT contacts (1NO / 1NC) for common control switching tasks and is frequently specified for industrial control and automation applications. Distributor datasheets indicate a general-purpose switching rating near 5 A @ 125 VAC and sealed construction suitable for dusty or washdown conditions.

• Actuator: cross-roller plunger (rolling contact) for low friction and precise, repeatable actuation.
• Contacts & rating: single-pole double-throw (SPDT) with 1 normally-open and 1 normally-closed contact; distributor datasheets list typical general-purpose ratings around 5 A at 125 VAC.
• Termination & installation: screw-terminal wiring (screw-clamp style) for straightforward field wiring and replacement.