The D4E-1A21N is a roller-plunger limit switch from ‘s D4E coolant-resistant lineup, designed for position detection and end-of-travel sensing in machine-tool and industrial applications. The switch features sealed, coolant-resistant construction for improved resilience to oil and coolant exposure and a pre-wired cable lead to simplify replacement and installation.

• Exact model: D4E-1A21N – part of the D4E coolant-resistant limit switch family; roller-plunger actuator for compact, low-profile actuation.
• Durable, sealed design: Coolant-resistant housing suited to machine-tool and production environments; datasheet shows enhanced sealing for oil/coolant exposure.
• Sealed subminiature micro switch for compact sensing, interlock, and snap-action control applications.