Safety-Rated Interlock Switches

Safety rated interlock switches are safeguarding measures designed to improve safety in situations where guards or gates are used around hazardous machinery or equipment.

What are safety rated interlock switches used for?

In industrial situations, safety rated interlock switches prevent or permit the use of machinery, depending on safety conditions. They allow current to pass to the machine when it is safe to operate, for example when the machine's guard is closed. And they cut off the power if there's a potential hazard, such as a guard being opened. When a dangerous piece of equipment such as a metalworking machine is in operation, safety rated interlock switch might be used to ensure safety gates remain closed, excluding workers from hazardous areas.

Types of safety rated interlock switches

Safety rated interlock switches vary according to their lock type, maximum current and voltage, as well as their housing material. Guard-locking switches prevent access to machine parts that may still be in motion, even when the power has been cut. Hinge switches will close protective gates and guards in unsafe conditions.


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Description Price Connection Type Lock Style Normal State Configuration Lock Type Actuator Included Housing Material Maximum AC Voltage Safety Contacts Maximum DC Voltage Range IP Rating Number of Head Directions Series Auxiliary Contacts
RS Stock No. 252-3864
Mfr. Part No.XCSPA591
TWD1,526.00
Each
units
- Key 1NC/1NO - - Polyamide 240V - 250V Preventa IP67 8 XCSPA -
RS Stock No. 362-2782
Mfr. Part No.AZ16-12ZI-B1-M20
BrandSchmersal
TWD2,579.00
Each
units
M20 Key 2NC/1NO - Yes Glass Fibre Reinforced Thermoplastic 230V 2NC 24V - IP67 3 AZ16 1NO
RS Stock No. 185-7258
Mfr. Part No.M-TS (D401)
BrandIDEM
TWD7,075.00
Each
units
M6 Screw Key - Interlock - Die Cast Metal, Stainless Steel - - - - - 2 M-TS -
RS Stock No. 136-3173
Mfr. Part No.6016469066
TWD1,627.00
Each
units
Screw Key 2NC - Yes PBT 240V - 250V - IP65 4 SKT -
RS Stock No. 185-7259
Mfr. Part No.M-HS (D401)
BrandIDEM
TWD6,325.00
Each
units
M6 Screw Key - Interlock Yes Die Cast Metal, Stainless Steel - - - - - - M-HS -
RS Stock No. 826-3906
Mfr. Part No.208007
BrandIDEM
TWD3,850.00
Each
units
M20 Key 3NC/1NO - - Stainless Steel 240V 3NC - Kobra IP67, IP69K 4 K-SS 1NO
RS Stock No. 279-6400
Mfr. Part No.XCSTA791
TWD3,874.00
Each
units
Screw Key 2NC/1NO - - Glass Fibre Reinforced PA 240V 2NC/1NO 250V Preventa IP67 8 XCSTA -
RS Stock No. 179-4742
Mfr. Part No.HS5L-VA44LM-G
BrandIdec
TWD4,258.00
Each
units
M20 Key 1NC/1NO (Door Monitor), 1NC/1NO (Lock Monitor) Spring Lock - Metal (Head) 250V 1NC/1NO (Door Monitor), 1NC/1NO (Lock Monitor) 30V - IP67 - HS5L -
RS Stock No. 133-0083
Mfr. Part No.XCSA802
TWD8,951.00
Each
units
M20 Key 3NC - Yes Zamak 240V 3NC 250V Preventa IP67 8 XCSA -
RS Stock No. 666-4940
Mfr. Part No.XCSB502EX
TWD19,723.00
Each
units
Screw Key 1NC/2NO - - Zamak 240V 1NC/2NO 250V Preventa IP67 8 XCSB -
RS Stock No. 861-4641
Mfr. Part No.D4GS-N2T
BrandOmron
TWD3,344.00
Each
units
Cable Key 2NC - - Plastic 240V 1NC 250V - IP67 2 D4GS 1NC
RS Stock No. 498-911
Mfr. Part No.3SE5112-0QV10
BrandSiemens
TWD3,559.00
Each
units
M20 Key 2NC/1NO - - Metal 230V - 230V Sirius IP66, IP67 5 3SE5 2NC/1NO
RS Stock No. 133-0069
Mfr. Part No.XCSE73117
TWD16,270.00
Each
units
- - - - Yes Zamak 240V 2NC 250V Preventa IP67 - XCS-E -
RS Stock No. 189-5309
Mfr. Part No.6018200002
TWD4,906.00
Each
units
Screw - NC/NO (Guard Lock), NC/NO (Inter Lock) Guard Lock, Inter Lock Yes Glass Fibre Reinforced Thermoplastic 24V NC/NO (Guard Lock), NC/NO (Inter Lock) 24V - IP67 - SLC -
RS Stock No. 185-7260
Mfr. Part No.M-KE-NS3 (A101, B201, C301)
BrandIDEM
TWD15,441.00
Each
units
M6 Screw Key - Interlock - Die Cast Metal, Stainless Steel - - - - - - M-KE -
RS Stock No. 181-1201
Mfr. Part No.106870 & LS-11S-ZB
BrandEaton
TWD3,301.00
Each
units
Cage Clamp - NO/NC Spring Lock Yes Insulated Material 415V NO/NC 220V - IP65, IP66 1 LS4 ZB -
RS Stock No. 189-5314
Mfr. Part No.3911742390
TWD245.00
Each
units
M4 Screw - - - - - - - - - - - - -
RS Stock No. 814-7006
Mfr. Part No.XCSE7313
TWD19,595.00
Each
units
Cable Key 2NC/1NO - Yes Zamak 240V 1NC/1NO 250V Preventa IP67 8 XCSE -
New
RS Stock No. 219-9205
Mfr. Part No.XCSPL751
TWD1,972.00
Each
units
Terminal Keyed 1 NC + 1 NC Solenoid - Plastic - - - - - - Preventa Safety Detection -
RS Stock No. 549-558
Mfr. Part No.D4NS-8CF
BrandOmron
TWD2,619.00
Each
units
M20 Key 2NC/1NO - - Plastic 240V 2NC/1NO 250V - IP67 4 D4NS -