Limit Switch with Roller Lever 2NC IP67 (ZK 256-02Z-M20) – Schmersal

Limit switch from Schmersal with offset roller lever and 2 NC safety contacts, designed for reliable position detection and safety applications. 

General information 

reference number: ZK 256-02Z-M20 
Type: Limit switch 
Actuator: Offset roller lever 
Contacts: 2 x NC 
Housing: Thermoplastic 
Protection class: IP65 / IP67 
Weight: 0.08 kg 
 

Electrical data 

Rated voltage (AC-15): 240 V 
Current (AC-15): 4 A 
Rated voltage (DC-13): 24 V 
Current (DC-13): 1 A 
Thermal current: 10 A 
Rated insulation voltage: 500 V 
Impulse withstand voltage: 6 kV 
 

Mechanical data 

Mechanical life: 20,000,000 operations 
B10D (NC): 20,000,000 
Actuating force: min. 9 N 
Positive break force: min. 19 N 
Actuating speed: 
min: 24 mm/min 
max: 1 m/s 
 

Connection 

Cable entries: 2 x M20 x 1.5 
Termination: Screw terminals 
Wire size: 0.75–2.5 mm² 
 

Environmental 

Temperature: -30 °C to +80 °C 
Resistance: Oil and petroleum resistant 
 

Dimensions 

Width: 58 mm 
Height: 82.1 mm 
Depth: 31 mm 
 

Function 

Snap-action switching 
Positive opening (safety function) 
Adjustable actuator head (4 x 90°) 
 

Application 

Escalators 
Machine safety 
Automation systems