Form factor and how the D4B4515N sits in a panel
The Omron D4B4515N is a D4B-series limit switch in a metal housing with screw terminals and a roller lever actuator, carrying 1NO/1NC slow-action contacts at an operating force of 9.4 N — the lever arm is the part that physically interacts with the moving cam or dog on the machine, and the 9.4 N figure sets the cam profile and return-spring design on the actuator side. With IP67 sealing and a metal body, the switch is specified for washdown and outdoor machinery enclosures; the sealing is at the housing and cable entry, not at the actuator pivot, so the roller/lever interface still needs guarding against dust and water ingress at the cam.
Contact block and switching envelope
The contact element is slow-action (not snap-action), which means the make/break travel tracks the lever position rather than tripping at a fixed differential — slow-action is the right choice when the application needs the contacts to hold a definite state up to the operating point and to repeat the trip point accurately over many cycles, but it does not give the snap-action feel of a quick-break block.