Solenoid Interlock Switches

Solenoid interlock switches allow guards or gates to be securely locked while dangerous processes are in operation. They require an internal solenoid to be energised before the guard can be opened and remain locked until all equipment has ceased moving.

What are solenoid interlock switches used for?

Solenoid interlock switches are widely used in machinery where an interruption could cause damage. This kind of switch mechanism is crucial when operating machinery where the hazard continues even after power supply to a device is stopped, for example when using circular saw blades. Solenoid interlock switches are also used where there is regular entry to dangerous areas, such as high temperature or pressurised sites.

How do solenoid interlock switches work?

Solenoid interlock switches are operated by magnetic force and respond when a guard opens. A machine can't start until the switch's guard is closed and locked, and it will hold the guard closed until dangerous processes are complete. Interlock switches use positive opening safety contacts for high reliability and can only be operated with one of the keys provided.


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Description Price Range Power to Lock / Unlock Series Pole Configuration Supply Voltage Normal State Configuration Actuator Included Rated stroke Actuator Type Interface Safety Contacts Conduit Entry Auxiliary Contacts Length
RS Stock No. 357-9206
Mfr. Part No.440G-T27129
£192.85
Each
Units
TLS-2-GD2 Power to Lock 440G-T - 230 V ac - - - - - 2NC M20 NO 126mm
RS Stock No. 763-6937
Mfr. Part No.3SE5322-0SB21
BrandSiemens
£163.38
Each
Units
Sirius Power to Lock 3SE5 - 24 V dc - - - Various Options - 2NC M20 1NO 54mm
RS Stock No. 537-7119
Mfr. Part No.440G-MT47016
£170.52
Each
Units
- Power to Unlock 440G-MT - 230 V ac/dc - - - - - 3NC M20 NO 40mm
RS Stock No. 357-9228
Mfr. Part No.440G-T27138
£192.85
Each
Units
TLS-3-GD2 Power to Unlock 440G-T - 110 V ac - No - Various Options - 2NC M20 1NO 126mm
RS Stock No. 826-3997
Mfr. Part No.202001-SS
BrandIDEM
£149.49
Each
Units
SAMLOCK Power to Unlock KLM - 24 V ac/dc - No - Various Options - 2NC M20 1NO 176mm
RS Stock No. 820-3771
Mfr. Part No.D4SLN4NDAD
BrandOmron
£155.90
Each
Units
- Power to Unlock D4SL-N - 24 V dc - No - Various Options - 2NC/1NO M20 2NC/1NO 39mm
RS Stock No. 609-6732
Mfr. Part No.XCSE7511
£314.45
Each
Units
Preventa Power to Lock XCS-B - 24 V ac/dc - Yes - Key - 1NO/2NC PG13.5 - 98mm
RS Stock No. 739-0571
Mfr. Part No.XCSLF2525312
£130.00
Each
Units
Preventa Power to Unlock XCS-LF - 24 V ac/dc - Yes - Key - 1NO/1NC M20 - 205mm
RS Stock No. 362-2596
Mfr. Part No.AZM190-02/10RK-24VDC
BrandSchmersal
£205.89
Each
Units
- Power to Unlock AZM 190 - 24 V dc - No - Various Options - 3NC M20 - 41mm
RS Stock No. 880-1898
Mfr. Part No.MZM 100 ST2-1P2PWREM-A
BrandSchmersal
£617.67
Each
Units
- Power to Lock MZM 100 - 24 V dc - No - Straight - 2 PNP M12 1 PNP 40mm
RS Stock No. 498-983
Mfr. Part No.3SE5322-1SD21
BrandSiemens
£174.43
Each
Units
Sirius Power to Unlock 3SE5 - 24 V dc - - - Various Options - 2NC M20 1NO 54mm
RS Stock No. 873-2184
Mfr. Part No.440G-T27241
£299.97
Each
Units
TLS-2-GD2 Power to Lock 440G-T - 24 V ac/dc - Yes - Straight - 2NC M23 1NO 126mm
RS Stock No. 810-4056
Mfr. Part No.440G-LZS21SPLA
£201.00
Each
Units
- Power to Lock 440G-LZ - 24 V dc - Yes - Standard - 2 PNP 3 m Cable 1 PNP 140mm
RS Stock No. 862-1674
Mfr. Part No.D4SL-N4QFA-DN
BrandOmron
£147.62
Each
Units
- Power to Unlock D4SL-N - 24 V dc - No - Various Options - 3NC M20 2NC/1NO 39mm
RS Stock No. 198-655
Mfr. Part No.XCSTE7341
£207.00
Each
Units
Preventa Power to Unlock XCS TE - 230 V ac/dc - - - - - 2NC 1/2 in, PG11 NC 94mm
RS Stock No. 617-5093
Mfr. Part No.AZM190-02/01RK-24VDC
BrandSchmersal
£222.46
Each
Units
- Power to Unlock AZM 190 - 24 V dc - No - Various Options - 3NC M20 - 41mm
RS Stock No. 810-4087
Mfr. Part No.440G-LZS21UPLB
£245.00
Each
Units
- Power to Lock 440G-LZ - 24 V dc - Yes - Unique - 2 PNP 10 m Cable 1 PNP 140mm
RS Stock No. 880-1772
Mfr. Part No.AZM 200SK-T-1P2PW
BrandSchmersal
£339.83
Each
Units
- Power to Unlock AZM 200 - 24 V dc - No - Various Options - 2 PNP 1/2 NPT 1 PNP 40mm
RS Stock No. 746-7277
Mfr. Part No.D4NL-4AFA-B
BrandOmron
£157.20
Each
Units
- Power to Unlock D4NL - 24 V dc - - - Various Options - 1NC/1NO 1/2 NPT NC/NO 88.5mm
RS Stock No. 810-4052
Mfr. Part No.440G-LZS21SPRH
£204.02
Each
Units
- Power to Unlock 440G-LZ - 24 V dc - Yes - Standard Guardlink 2 PNP M12 1 PNP 140mm