Konrak Compact Limit Switch
A compact double-circuit limit switch with a 1NO + 1NC contact block, housed in a zinc die-cast base with a reinforced plastic cover. A double-spring mechanism gives a long mechanical life and large over-travel, and the terminal section opens fully for easy wiring.
One body, many ways to actuate
The TZ-8 is available with a range of heads and actuators so that it can be matched to almost any motion profile.
TZ-8104
Roller lever — general-purpose swing arm with roller.
TZ-8107
Adjustable roller lever, 30 mm arm.
TZ-8108
Adjustable roller lever, longer arm for a higher operating force.
TZ-8111 / 8112
Top plunger — plain (8111) or with a roller on the plunger (8112).
TZ-8122
Top plunger, direct in-line actuation.
TZ-8166–8169
Whisker (cat's whisker) — coil-spring, very low operating force.
The TZ-8 range covers roller-lever, plunger and whisker types; please confirm the required model for your motion.
Switching capacity
Rated values to IEC/EN 60947-5-1. Continuous thermal current and utilisation categories for the TZ-8.
| Rated voltage | Resistive NC / NO | Lamp NC / NO | Inductive NC / NO | Motor NC / NO |
|---|---|---|---|---|
| 125 V AC | 5 / 5 A | 1.5 / 0.7 A | 3 / 3 A | 2 / 1 A |
| 250 V AC | 5 / 5 A | 1 / 0.5 A | 3 / 3 A | 1.5 / 0.8 A |
| 8 V DC | 5 / 5 A | 3 / 3 A | 5 / 4 A | 3 / 3 A |
| 14 V DC | 5 / 5 A | 3 / 3 A | 4 / 4 A | 3 / 3 A |
| 30 V DC | 5 / 5 A | 3 / 3 A | 4 / 4 A | 3 / 3 A |
| 125 V DC | 0.4 / 0.4 A | — | — | — |
| 250 V DC | 0.2 / 0.2 A | — | — | — |
Maximum inrush current: NC below 24 A, NO below 12 A. Inductive load values are for cos φ ≥ 0.4 (AC) and a time constant ≤ 7 ms (DC).
Actuation data
Operating forces and travels — matching the switch to your mechanism ensures a reliable, repeatable trip point.
| Model | OF max | RF min | PT max | OT min | MD max |
|---|---|---|---|---|---|
| TZ-8104 | 5.88 N | 0.49 N | 20° | 75° | 10° |
| TZ-8107 | 5.88 N | 0.69 N | 20° | 75° | 10° |
| TZ-8108 | 7.84 N | 0.49 N | 20° | 75° | 10° |
| TZ-8111 / 8112 | 9.8 N | 2.94 N | 1.5 mm | 4 mm | 1.2 mm |
| TZ-8122 | 9.8 N | 2.94 N | 1.5 mm | 4 mm | 1.2 mm |
| TZ-8166–8169 | 0.88 N | — | 30 mm | — | — |
OF operating force · RF release force · PT pre-travel · OT over-travel · MD movement differential. Typical values.
TZ-8 technical data
| Housing | Zinc die-cast base with a reinforced plastic cover |
| Contact block | 1NO + 1NC double-circuit, built-in basic switch with a double-spring mechanism |
| Rated insulation voltage (Ui) | 380 V |
| Conventional thermal current (Ith) | 10 A |
| Rated operational current | AC-15 6 A / 250 V AC (refer to the ratings table for loads) |
| Max. lever travel | 95° |
| Operating speed | 0.5 mm/s – 0.5 m/s |
| Operating frequency | Mechanical 120 operations / min · electrical 30 operations / min |
| Contact resistance | ≤ 25 mΩ (initial) |
| Insulation resistance | > 100 MΩ (500 V DC) |
| Dielectric strength | 1000 V AC same polarity · 1500 V AC current-carrying to non-current-carrying and terminal-to-ground |
| Vibration | 10 – 55 Hz, 1.5 mm double amplitude |
| Shock | Mechanical 1000 m/s² · malfunction 300 m/s² |
| Electrical life | > 500,000 operations |
| Mechanical life | > 10,000,000 operations |
| Ambient temperature | −5 … +65 °C |
| Humidity | < 95% RH |
| Weight | approx. 130 – 190 g |
| Standards | IEC/EN 60947-5-1 · GB/T 14048.5 |
| Marking | CE · CCC |
Values shown are typical for this series — please confirm against the current datasheet and drawing for the exact variant required.
Why choose the TZ-8
Zinc die-cast base
A rigid zinc die-cast body with a reinforced plastic cover keeps the mechanism precisely aligned.
Compact design
About one third the size of a standard vertical limit switch, so it fits where space is tight.
Double-spring mechanism
A built-in basic switch with two springs gives a long mechanical life and smooth operation.
Large over-travel
A generous over-travel distance allows for mounting tolerance and overshoot.
Double circuit
1NO + 1NC contacts in one compact body.
Fully opening terminals
The terminal section opens completely for fast, easy wiring.
Sealed construction
Oil-tight and water-tight (IP65) for dusty and damp environments.
Many actuators
Roller levers, adjustable roller levers, plungers and whiskers cover a wide range of motion.
Where the TZ-8 is used
Machine tools
Position and end-of-travel detection on compact machine modules.
Control cabinets
Cabinet-door interlocking and position sensing.
Packaging machinery
Product sensing and mechanical end stops.
Elevators and doors
Levelling, door position and limit stopping.
Automation
Position feedback where a small switch is needed.
Dusty and damp areas
Sealed, oil-tight construction for demanding locations.
Frequently asked questions
How compact is the TZ-8?
It is roughly one third the size of a standard vertical limit switch, which makes it easy to fit into tight spaces.
What contacts does it have?
A double-circuit 1NO + 1NC contact block.
What is the degree of protection?
IP65 — dust-tight and protected against water jets; also oil-tight.
Which actuators are available?
Roller levers, adjustable roller levers, top plungers and whiskers.
What is the mechanical life?
> 10,000,000 mechanical operations, with > 500,000 electrical operations.
How long is the lever travel?
The maximum lever travel is 95°.
Need the right TZ-8 limit switch?
Tell us the actuator, the contact arrangement and the mounting you need — our team will confirm the exact model and can supply samples or OEM versions.
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