SPECIFICATIONS

The CNTD CSA-051 is a heavy-duty limit switch from the CSA series with an ADJUSTABLE swing rod and plastic roller actuator (official head structure: "Adjustable swing rod plastic roller type"). Where the fixed-lever CSA-021/021M requires the target to approach along one set path, the CSA-051's swing rod can be adjusted/repositioned at installation (rotary indexing 22.5°) to match the direction and position of the moving target — giving you mounting flexibility for custom fixtures, retrofit machines, and tight installations where the switch position is constrained but the trigger direction is not. The plastic roller at the rod tip rotates smoothly on contact, reducing friction and wear on both the switch and the target surface while protecting painted or delicate surfaces from metal-on-metal damage. Operating force OF 4N (half the 8N of plunger types — the lever's mechanical advantage means less force is needed at the roller), pretravel PT 20°, and a generous 75° overtravel deliver definitive, repeatable switching with high tolerance for cam overshoot. The zinc alloy and reinforced plastic housing provides high mechanical strength for harsh industrial environments, while the IP66 waterproof and oil-proof construction handles coolant mist, oil splash, and dust.

The CSA series is CNTD's heavy-duty limit switch platform. Compared with compact series, the CSA offers: larger overtravel distance for forgiving alignment, double-spring contact box design for long mechanical life (10,000,000 operations min.), and an M18 cable gland (PG11 optional) for robust heavy-duty wiring. The built-in snap-action 1NO + 1NC double-circuit contacts provide one normally-open and one normally-closed output for control and indication circuits.

Key Specifications:

Model: CSA-051 (CSA Series)

Action Type: Adjustable swing rod + plastic roller (side-approach, rolling contact, field-adjustable, rotary indexing 22.5°)

Contact Configuration: 1NO + 1NC (Snap-Action, double circuit)

Rating: Ith 10A; AC-15 6A/250V; DC-13 0.3A/220V (resistive load)

Operating Force OF: 4N

Release Force RF: 1N

Pretravel PT: 20° (angle)

Overtravel OT: 75° (angle)

Movement Differential MD: 10° (angle)

Total Travel TT: 95° (angle)

Operating Position TP: 22.5° ±10%

Rotary Indexing: 22.5° (swing rod repositioning steps)

Protection: IP66 (nameplate-first; official spec IP65)

Cable Entry: M18 cable gland (PG11 optional)

Rated Insulation Voltage Ui: 380V (nameplate-first; official spec 300V)

Rated Impulse Withstand Voltage Uimp: 4kV

Minimum Applicable Load: DC 24V 10mA or more

Contact Resistance: ≤25mΩ (initial)

Insulation Resistance: ≥100MΩ (at 500VDC)

Inrush Current Rating: NC: Max. 24A / NO: Max. 12A

Operating Speed: 5mm/s ~ 0.5m/s

Operating Frequency: 30 operations/min (electrical)

Mechanical Life: 10,000,000 operations min.

Electrical Life: ≥500,000 ops (AC 240V/3A) / ≥300,000 ops (AC 240V/6A); official page 500,000 ops at 250V/6A

Ambient Temperature: -20℃ ~ +70℃ (no icing)

Humidity: ≤95% RH

Vibration Resistance: 10~55Hz, 1.5mm double amplitude

Shock Resistance: Mechanical: 1000m/s² (100G) / Malfunction: 300m/s² (30G)

Shell Material: Zinc alloy + reinforced plastic

Certification: CCC (GB/T 14048.5), CE & TUV (EN 60947-5-1)

Features:

• ADJUSTABLE swing rod — reposition the rod at installation (rotary indexing 22.5°) to match target approach direction and position

• Mounting flexibility for custom fixtures, retrofit machines and tight installations where a fixed lever cannot reach

• Plastic roller contact — smooth rotation, low friction, long life, protects painted/delicate surfaces

• Generous 75° overtravel for smooth operation and cam overshoot tolerance (CSA series advantage)

• Operating force only 4N — lever advantage means less force needed at the roller

• Snap-action 1NO + 1NC double-circuit contacts, Ith 10A, AC-15 6A/250V

• Zinc alloy + reinforced plastic housing — high mechanical strength, waterproof & oil-proof, IP66

• M18 cable gland for secure heavy-duty wiring (PG11 optional)

• Double-spring contact box design, mechanical life 10,000,000 operations min.

• 12+ actuator variants available in the CSA series for every application

Applications:

Custom fixture and retrofit machine position detection where the trigger direction must be adjusted, conveyor line side-position detection with dogs or cams, CNC machine tool cam-plate detection, elevator and lifting equipment travel limit, packaging machinery sensing, automated assembly line confirmation, and general industrial automation position detection where mounting position is constrained or the approach angle varies. For abrasive metal targets, consider CSA-021M or CSA-031M (metal roller); for fixed general-purpose lever applications, CSA-021 (plastic roller); for rubber roller contact with noise and surface protection, CSA-041 (fixed) — both CSA-051 and CSA-041 share the same travel parameters. For direct vertical approach, consider the plunger types CSA-001/003. Suitable for indoor and sheltered outdoor industrial environments.

CSA-051 vs Other CSA Models:

The CSA-051's adjustable swing rod + plastic roller is the go-to choice when the trigger position or direction needs installation-time flexibility with a surface-friendly plastic roller. The adjustable family: CSA-031 (official wording "Adjustable plastic roller lever type"), CSA-031M (adjustable lever with metal roller for abrasive targets), and CSA-051 (official wording "Adjustable swing rod plastic roller type", this item) — all share identical travel parameters (OF 4N / RF 1N / PT 20° / OT 75° / MD 10° / TT 95° / TP 22.5° ±10%) and rotary indexing 22.5°; official pages distinguish 031 as "plastic roller lever" and 051 as "swing rod plastic roller". Fixed-lever alternatives: CSA-021 (plastic roller), CSA-021M (metal roller), CSA-041 (rubber roller). All CSA models share the same electrical specs (Ith 10A, IP66, 1NO+1NC snap-action, M18 cable gland).

Package Includes:

1 x CSA-051 Adjustable Swing Rod Plastic Roller Limit Switch