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CM-S221 safety switches are a coded magnet safety switch 
for use in machine guarding applications.  

Designed for use in applications where increased security is 
required, the CM-S221 has a coded magnetic actuator and 
cannot be fully operated with a single magnet. 

The CM-S221 switches are designed to be connected to a 
safety control circuit which has less than 0.5 Amps 
inrush current. 

The CM-S221 is manufactured in a robust ABS housing and 
fully sealed to IP67 and can be used in wet or dusty 
environments. 

With correct installation, the CM-S221 safety switches comply   
with the guidelines given in EN1088. 

 

CE 

Complies with the relevant sections of the CE 
marking directive.  

UL 508 

Industrial Control Equipment 

EUROPEAN DIRECTIVES 

Machinery Directive 98/37/EC  

Low Voltage Directive 73/23/EC 

Electromagnetic Compatibility Directive 89/336/EC  

EUROPEAN STANDARDS 

EN292 

Safety of Machinery 
Basic concepts, general principles for design. 

EN 60204  Safety of Machinery 

Electrical equipment of machines. 

EN 954-1 

Safety of Machinery 
Safety related parts of controls systems  

EN 1088 

Interlocking devices associated with guards. 

EN  
60947-5-3 

Safety of Machinery 
Specification for low voltage switchgear and 
control gear. 

Interlocked guards where door locking is not required.  
Food and Beverage packing/filling systems 
Dairy  
Pharmaceutical 
Paper Industry  
Can Forming and Filling, (Aluminum, Steel, Plastic)  
Semiconductor Manufacture/Assembly. 

Description 

A Declaration of Conformity can be obtained from the  
Omron Scientific Technologies, Inc. web Site: www.sti.com 

When the safety switch and actuator are within the specified 
operating range (see table on page 3 for switching 
distances), the N/C contacts will be closed and the N/O 
contacts will be open. 

When the actuator moves out of the operating range, the N/C 
contacts will open and the N/O contacts will close. Both the 
N/C and N/O contacts may be used for safety. 

The CM-S221 safety switch and actuator are designed to 
approach each other from most angles. When the switch is 
closed the targets on the printed face of the switch must be 
aligned.

 

Operation 

Applications 

Approvals 

Certificate of Conformity 

Safety, 
Technology 
& Innovation 

CM Series

This information is designed to help suitably qualified 
personnel install and operate Omron Scientific Technologies, 
Inc. safety switch equipment.  
Before using this product, read this guide thoroughly along 
with any relevant European and/or National Standards e.g. 
Machinery Directive 89/392/EEC and it’s Amendments, 
Provision and Use of Work Equipment Regulations.  

Further information can be obtained from 

Omron Scientific Technologies, Inc.

 

KEEP THIS GUIDE FOR FUTURE REFERENCE  

Operating Instructions for CM-S221 Safety Switches

 

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