Question
Do the Lighted Models of A165E/A22E Series Emergency Stop Switches require external resistance for the LED?
Answer
An LED current-limiting resistor is built-in, so internal resistance is not required.
 F3SR-B
F3SR-B 
                    
                  For Safety Light Curtain Robust & Basic New Lineup. Understanding the Indicators at a Glance.
 OS32C
OS32C 
                    
                  Compact (104.5 mm), lightweight (1.3 kg) and easy-to-install Safety Laser Scanner
 D40Z
D40Z 
                    
                  Supports ISO 13849-1 (PLe/Safety Category 4). Can be used on higher risk level applications by connecting to Safety Controllers.