CNTD TZ-8108 Limit Switch Rotary Adjustable Roller Switch Rotary Switch

The CNTD TZ-8108 is a rotary adjustable roller limit switch for woodworking machinery, used where a lever must trip at a precise, changeable point. It carries a 380V rating, AC 15 and DC 13. The roller lever adjusts by rotation, so you set the actuation point on the machine rather than shimming the mount. Check your old switch's lever action and terminal layout against the TZ-8108 before ordering. It is a spare part for machines already using a rotary lever switch.

When a fence, carriage or guard reaches its stop and the machine keeps running, the limit switch has stopped tripping where it should. A fixed lever that no longer contacts the cam, or a roller worn flat, leaves the control circuit waiting.

This is a CNTD limit switch, model TZ-8108, built as a woodworking machine spare part. Electrical ratings are 380V, AC 15 and DC 13. The actuator is a rotary adjustable lever arm with roller, operating as a momentary rotary switch. Fit is confirmed by matching the old unit's lever reach and roller position to the TZ-8108 and checking the terminal arrangement in your control box.

Mount the switch body on the existing bracket, then rotate the lever arm to set where the roller meets the cam or dog. Because the action is momentary, the contact closes only while the lever is held and opens when it releases. That suits end-of-travel and gate sensing.

Supply is the TZ-8108 switch as a spare part; packing and customisation are not specified here. Send your machine make and model, a photo of the old switch showing lever and roller position, and the terminal layout from the control box. State the voltage present at the switch and whether the lever is straight or offset.

What the specification fixes, and what it leaves to the machine:

• Actuation point setting — The rotary adjustable lever arm lets you set where the roller trips against the cam, so the switch follows the machine's existing stop position.
• Lever reset without bracket change — Rotating the arm to reset the roller position means you adjust at the switch rather than re-drilling or shimming the mounting bracket.
• Roller contact wear point — The roller runs against the cam or dog, so wear shows at the roller first; check it for flats before blaming the contact block.
• Momentary contact behaviour — Momentary action closes the contact only while the lever is held and opens on release, which suits end-of-travel and gate sensing.
• Voltage rating for control circuits — A 380V rating with AC 15 and DC 13 covers the control-circuit loads named here; confirm your coil or signal load falls within those figures.
• Rotary switch operation — Operation is by rotary lever movement, so the switch responds to a cam passing the roller rather than to a plunger pushed straight in.
• Spare-part fit check — As a woodworking machine spare part, fit is confirmed by matching the old lever reach and roller position to the TZ-8108.

What changes on the shop floor when the right part goes back in:

• Set the trip point at the switch. Rotating the lever arm moves the roller to meet the cam where the machine actually stops, so you avoid reworking the bracket to chase a fixed lever.
• One wear point to inspect. The roller is the contact point against the cam, so a flat or rough roller is visible on inspection before the switch fails to trip.
• Momentary action suits gates and stops. The contact holds only while the lever is pressed and releases when the cam passes, which matches end-of-travel and guard sensing on woodworking machines.
• Ratings you can check against the circuit. With 380V, AC 15 and DC 13 marked, your electrician can compare the control-circuit load to the switch before installation rather than after.
• Adjustment without drilling. Because the lever rotates to position, a machine change that shifts the actuation point can be met by resetting the arm instead of moving the mounting holes.
• Spare-part identification is direct. The CNTD TZ-8108 model number gives your stores and maintenance team one reference to quote, reducing the chance of fitting a different lever type.

Match the old switch's lever reach, roller position and terminal layout to the TZ-8108. Those three checks decide fit; send a photo of the removed switch and the control-box terminal layout so the match can be confirmed.

Rotate the lever arm until the roller meets the cam where the machine should trip. Set it so the roller rides the cam through its full stroke, not just at the tip, then lock the arm and test the stop.

They are the load ratings named for this switch, alongside a 380V rating. Have your electrician compare the coil or signal load in your control circuit to those figures before wiring the replacement.

The action is momentary: the contact closes while the lever is held and opens when it releases. That suits end-of-travel and gate sensing rather than a maintained on/off position.

The roller is the contact point against the cam, so check it for flats or roughness first. A worn roller changes where the lever trips even when the contact block is still working.

Yes, if the bracket holds the switch body and the lever can be rotated to reach the cam. The rotary arm is set by rotation, so the bracket does not need re-drilling for a small change in actuation point.

Send the machine make and model, a photo of the old switch showing lever and roller position, the terminal layout from the control box, and the voltage present at the switch.

That depends on the version supplied, so state which your machine uses. Include it with the machine details and photo so the lever type can be checked against the TZ-8108 before dispatch.