| Part Number: | CZ-7 | 121 |
|---|---|---|
| Explanation: |
Series CZ-7 - Standard horizontal limit switch family |
Actuator 140 - Short lever |
CZ-7 horizontal limit switches provide snap-action changeover contacts with a choice of lever, roller, plunger and flexible spring-rod actuators. Choose the head to suit the direction of approach, available operating force and permitted travel. The IP64 rating applies to the operating surface; protect the terminal area and keep the switch out of oil or water immersion.
The model consists of the fixed family identifier CZ-7 followed directly by the three-digit actuator code. For example, CZ-7121 selects the long roller lever. All models use one normally open and one normally closed contact sharing COM. The following lever values apply in the operating direction shown in the dimensional drawing.
| Model | Code | Actuator | OF max. | RF min. | PT max. | OT min. | MD max. | OP | FP |
|---|---|---|---|---|---|---|---|---|---|
| CZ-7121 | 121 | Long roller lever | 1.8N | 0.5N | 11mm | 3mm | 2.4mm | 40±1mm | — |
| CZ-7141 | 141 | Short roller lever | 2.4N | 0.8N | 6.5mm | 2mm | 1.5mm | 46mm | |
| CZ-7120 | 120 | Long lever | 1.5N | 0.4N | 13.5mm | 4mm | 3.2mm | 25±1mm | 35mm |
| CZ-7140 | 140 | Short lever | 2.2N | 0.6N | 8.5mm | 2.5mm | 2mm | 32mm | |
| CZ-7124 | 124 | Raised roller long lever | 2N | 11mm | 3mm | 2.4mm | 50±1.2mm | — | |
| CZ-7144 | 144 | Raised roller short lever | 2.8N | 1N | 6.5mm | 2mm | 1.5mm | 56mm | |
| CZ-7100 | 100 | Low plunger | 6N | 2mm | 0.8mm | 0.8mm | 30.5±0.8mm | — | |
| CZ-7110 | 110 | High plunger | 5mm | 44±1.2mm | |||||
| CZ-7310 | 310 | Panel-mount plunger | 6mm | 21.8±1.2mm | |||||
| CZ-7311 | 311 | Panel-mount transverse roller plunger | 33.3±1.2mm | ||||||
| CZ-7312 | 312 | Panel-mount vertical roller plunger |
| Model | Code | Actuator | OF max. | Angular PT | Angular MD | Operating area |
|---|---|---|---|---|---|---|
| CZ-7166 | 166 | Plastic rod with coil spring | 1.2N | 12±3° | 3±1° | Actuate within the upper one-third of the actuator length, measured from the tip |
OF is operating force, RF release force, PT pretravel, OT overtravel, MD movement differential, OP operating position and FP free position. A dash means no value is specified. The spring-rod angular MD is a switching differential, not an overtravel allowance; RF, OT, OP and FP are not specified for CZ-7166.
| Parameter | Value and conditions |
|---|---|
| Operating speed | 0.05mm/s–0.5m/s |
| Electrical operating frequency | 20 operations/min |
| Initial contact resistance | 25mΩ maximum |
| Insulation resistance | 100MΩ minimum at500VDC |
| Minimum applicable load | 24VDC,10mA |
| Rated insulation voltage Ui | 380V |
| Impulse withstand voltage Uimp | 4kV |
| Conventional free-air thermal current Ith | 10A |
| Dielectric strength: open terminals of the same polarity | 1000VAC,50/60Hz,1 minute |
| Dielectric strength: live parts to non-current-carrying metal | 1500VAC,50/60Hz,1 minute |
| Dielectric strength: each terminal to ground | |
| Vibration, malfunction resistance | 10–55Hz,1.5mm double amplitude |
| Shock, mechanical durability | 1000m/s² |
| Shock, malfunction resistance | 100m/s² |
| Ambient temperature | -20°C to+70°C, without icing |
| Humidity | General-purpose type:85%RH maximum; sealed type:95%RH maximum where specified |
| Protection | IP64 at the operating surface |
| Electrical durability:240VAC/3A resistive | More than500000 cycles |
| Electrical durability:240VAC/10A resistive | More than200000 cycles |
| Electrical durability:250V/6A resistive | More than500000 cycles |
Life figures apply to the stated load conditions. Do not use the thermal current, insulation voltage or a resistive-load rating as a substitute for the applicable switching duty.
| Voltage | Noninductive load | Inductive load | ||||||
|---|---|---|---|---|---|---|---|---|
| Resistive | Lamp | Inductive | Motor | |||||
| NC | NO | NC | NO | NC | NO | NC | NO | |
| 125VAC | 10A | 3A | 1.5A | 10A | 5A | 2.5A | ||
| 250VAC | 2.5A | 1.25A | 3A | 1.5A | ||||
| 480VAC | 3A | 1.5A | 0.75A | 2.5A | 1.5A | 0.75A | ||
| 8VDC | 10A | 3A | 1.5A | 6A | 5A | 2.5A | ||
| 14VDC | ||||||||
| 30VDC | 6A | 5A | ||||||
| 125VDC | 0.5A | 0.4A | 0.05A | 0.05A | ||||
| 250VDC | 0.25A | 0.2A | 0.03A | 0.03A | ||||
Inductive-load conditions are AC power factor0.4 minimum and DC time constant7ms maximum. Lamp-load inrush is10 times steady current; motor-load inrush is6 times steady current.
| Utilization category | Rated operational voltage | Rated operational current |
|---|---|---|
| AC-15 | 250V | 10A |
| DC-13 | 220V | 0.3A |
| CSA C22.2 No.14 voltage | Continuous current | Current limits | Apparent-power limits | ||
|---|---|---|---|---|---|
| Make | Break | Make | Break | ||
| 250VAC | 10A | 60A | 6A | 7200VA | 720VA |
| 30A | 3A | ||||
Observe both current and VA limits when choosing a switching duty; the make/break current figures do not override the VA limits at the operating voltage.
| Marking/specification | Referenced standard |
|---|---|
| CCC | GB/T14048.5 |
| TÜV | EN60947-5-1 |
| CE |
Confirm the applicable conformity documentation for the selected model and destination before specifying an approval requirement.
Use the model-specific drawing in the attachment to establish actuator clearances and position datums. Most bodies have54±0.2mm length,21.4±0.4mm width, twoØ4.2±0.2mm mounting holes on25.4±0.15mm centers, and a cable sleeve extending16.5mm maximum. The plain-lever drawings specify54.4±0.2mm body length and21.4±0.15mm width. Do not substitute body mounting datums for the panel-plunger OP datum.
| Model group | Actuator dimensions and mounting |
|---|---|
| CZ-7121/CZ-7124 | Ø12.3×8mm rollers;60.7mm lever radius; raised roller version has an additional10.9mm offset |
| CZ-7141/CZ-7144 | Ø12.3×8mm rollers;44mm lever radius; raised roller version has an additional10.9mm offset |
| CZ-7120/CZ-7140 | Plain levers6.6mm wide; long and short lever radii74.5mm and50mm respectively |
| CZ-7100/CZ-7110 | Low plungerØ7mm; high plungerØ7.9mm |
| CZ-7310/CZ-7311/CZ-7312 | M12×1 panel thread;7310 plungerØ7.9mm; roller versionsØ12.6mm. Use the panel cutout drawing:Ø12.5±0.2mm with13±0.2mm and5±0.2mm keyed dimensions |
| CZ-7166 | Plastic rodØ3mm; actuator length126mm; overall height145mm; contact the upper third only |
| Fastener | Tightening torque |
|---|---|
| M3.5 terminal screw | 0.59–0.78N·m |
| Panel mounting nut | 2.94–4.91N·m |
| M4 side mounting screw | 1.18–1.47N·m |
Use flat and spring washers for side mounting. Remove the actuator hex nut when side-mounting CZ-7310, CZ-7311 or CZ-7312. Do not exceed the panel mounting torque limit. The installation drawing specifies twoØ4.3mm clearance holes or M4 tapped holes on25.4±0.15mm centers.
| Conductor type | Cores | Conductor size | Finished shape and OD |
|---|---|---|---|
| Flexible insulated wire | 2 | 0.5–0.75mm² | Circular,Ø6–9mm |
| 3 | |||
| 4 | |||
| 600V plastic-insulated, plastic-sheathed VVF cable | 2 | Ø1mm/Ø1.2mm/Ø1.6mm conductor |
The cable outlet sealing rubber acceptsØ8.5–10.5mm cable; the stated outlet example uses2-core or3-core VCT1.25mm² cable. Choose a cable and termination that meet both their relevant requirements. For insulated M3.5 crimp connections, use0.5–0.75mm² conductors (AWG20–18) and terminals no thicker than0.5mm. The terminal drawing specifies holeØ3.7mm, barrelØ2.9mm, width6.6mm, length19mm, and7.7mm/8mm section lengths. Route wires so that the cover closes freely and terminals cannot press against the case.
Isolate power before wiring or maintenance and keep wire fragments out of the enclosure. Avoid persistent vibration, impacts, metal chips, silicone contamination, hot water above60°C and steam. Open the terminal cover carefully without deforming its mating edges. Use contact-protection circuitry for inductive or high-inrush loads where required.
Standard contacts require at least24VDC and10mA for the stated low-load guidance. Select a contact design intended for smaller signals when operating below this range, and do not reuse contacts previously switched at general loads for small-signal duty. These switches require separate application approval for personnel-safety, high-reliability, explosive-atmosphere or similarly demanding service.
