Datasheet
SI-LM40 Series Limit Switch Style with Flexible In-Line Actuator
• Positive-opening safety contacts (IEC 60947-5-1) (not dependent upon springs)
• Standard limit switch design
• In-line actuator; flexes in all directions
• Metal housing
• Spring-loaded actuator base
• Protective Earth Terminal (IEC 60947-1) on models with metal housings
This symbol for a positive opening safety contact (IEC 60947-5-1) is used in the switching
diagrams to identify the point in actuator travel where the normally closed safety contact is fully
open.
Models
Kit Model
1
Actuator Type Interlock Body
Contact Configuration
(Actuator Engaged)
Contact Configuration
(Actuator Removed)
Switching Diagrams
2
SI-LM40MKVD
SI-QM-90A (Flexible, In-
Line)
SI-LM40KVD with Metal
Housing
3 (0.12)
1 (0.04)*
0 (0)
7 (0.28)
38 (1.5)
mm (in)
Engaged
Disengaged
11-12
23-24
Safety
Monitor
SI-LM40MKVE
SI-LM40KVE with Metal
Housing
3 (0.12)
0 (0)
7 (0.28)
38 (1.5)
mm (in)
Engaged
Disengaged
11-12
21-22
Safety
Safety
Contacts:
Open
Closed
Transition
WARNING:
• Spare actuators
• Using spare actuators to bypass the safety switch could create an unsafe situation that could result in
serious injury or death.
• Do not use spare actuators to bypass or otherwise defeat the protective function of a safety switch.
1
A kit contains an interlock and actuator. Individual interlock bodies or actuators are for replacement purposes only.
2
* Please note that only 1 mm (0.04 inches) of movement will open the closed contact.
SI-LM40 Series Safety Limit Switch
Original Document
50159 Rev. H
9 June 2020