The plunger-actuated L51 gives you straight-line position detection in the same rugged metal-bodied package as EMAS's roller-arm limit switch — IP65 sealed, 10 million mechanical cycles, with an M20 gland entry for a proper cable seal. Where a roller arm suits a swinging door or cam, this plunger version is the better fit for direct linear travel, like a slide or guard that pushes straight down onto the actuator.
Commonly used for:
- Door/lid shutoff on kilns and ovens
- Cold room and refrigerator doors
- CNC and motion control
- Machinery including lathes and mills
- Conveyors
Technical Details
Frequently Asked Questions
Should I choose the plunger or the roller arm version?
Choose the plunger if your actuating part moves in a straight line directly onto the switch (e.g. a sliding guard or linear stage). The roller-arm L51 variant suits swinging doors, cams, or anything approaching at an angle rather than head-on.
What does "snap action" mean for this switch?
Snap action means the internal contacts switch quickly and positively once the plunger passes its trip point, giving a clean, repeatable signal regardless of actuation speed.
What size cable gland do I need?
It has an M20 gland entry, so use an M20 cable gland matched to your cable diameter for a proper IP65 seal.
Can I use this on a cold room or freezer door?
Yes — with an operating range down to -25°C, it's suited to cold storage and refrigerator applications, one of its common uses.
Industry Applications
- Kilns, ovens & cold storage — door/lid interlocking across extreme temperature ranges
- CNC & machine tools — linear position sensing on lathes, mills, and motion control systems
- Conveyors & material handling — robust position/limit detection in high-cycle industrial settings