Safety Limit Switches

Limit switches operate with the movement of machinery, opening or closing the circuit when movement is detected. Safety limit switches provide a level of risk reduction over regular limit switches, as they have a positive actuation structure, which means that if a fault occurs they will stop conducting the electrical load.

What are safety limit switches used for?

Safety limit switches are used in industrial settings to reduce the risk factor in the event of overcurrent or electrical faults. This can be useful in a wide range of applications, from heating and ventilation to the operation of heavy machinery, where normal limit switches might provide a risk if they continued to conduct electricity in the event of a fault.

Types of safety limit switches

Safety limit switches mainly differ by the type of actuator they have. This can be a hinge, roller, rod or push bolt, for example.They can also vary by the number of contacts and cable entries that they have.


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Description Price Actuator Type Actuator Included Normal State Configuration Action Type IP Rating Connection Type Housing Material Number of Cable Entries Number of Contacts Size of Cable Entries Pole and Throw Configuration Series Depth Dimensions
RS Stock No. 749-7631
Mfr. Part No.3SE5122-0CE01
BrandSiemens
MYR229.78
Each
units
Roller Lever Yes NO/NC - IP66, IP67 Screw Metal - - - DPST 3SE5 37.8mm 85.7 x 56 x 37.8 mm
RS Stock No. 202-3847
Mfr. Part No.GHG2610005R0005
BrandCEAG
MYR1,663.31
Each
units
- - NO/2NC - - Screw Polyamide 2 3 M20 3P - 112mm 102 x 84 x 112 mm
RS Stock No. 698-8779
Mfr. Part No.EX-ZS 335-11Z-3G/D
BrandSchmersal
MYR514.76
Each
units
Plunger Yes NO/NC Snap - Screw Metal 1 2 M20 x 1.5 DP EX-ZS 335 38mm 66.5 x 40.5 x 38 mm
RS Stock No. 274-7981
Mfr. Part No.GHG2622301R0007
BrandCEAG
MYR2,223.57
Each
units
- - NO/NC - - Screw Polyamide 2 2 M20 DP - 112mm 102 x 84 x 112 mm
RS Stock No. 768-6361
Mfr. Part No.3SE5242-0KC05
BrandSiemens
MYR124.70
Each
units
Round Plunger Yes NO/2NC Slow - Screw Plastic 2 3 M20 x 1.5 - 3SE5 53mm 50 x 33 x 53 mm
RS Stock No. 836-2735
Mfr. Part No.D4N112H
BrandOmron
MYR169.18
Each
units
Adjust Roller Lever Yes NO/NC Snap IP67 Screw Metal 1 2 PG13.5 DPST D4N 82.5mm 31 x 48.2 x 82.5 mm
RS Stock No. 755-7900
Mfr. Part No.3SE5423-0CD20-1EB1
BrandSiemens
MYR295.16
Each
units
Roller Plunger Yes NC/NO Snap - M12 Screw - - 2 - DPST 3SE5 16mm 50 x 40 x 16 mm
RS Stock No. 757-9156
Mfr. Part No.D4B-4171N
BrandOmron
MYR219.47
Each
units
Roller Plunger Yes NO/NC Snap - Screw Metal 1 2 M20 DPST D4B-N 43mm 97 x 40 x 43 mm
RS Stock No. 621-1543
Mfr. Part No.D4N-1132
BrandOmron
MYR114.63
Each
units
Roller Plunger Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 31.5mm 83.6 x 31 x 31.5 mm
RS Stock No. 698-8776
Mfr. Part No.EX-ZS 335-02Z-3G/D
BrandSchmersal
MYR514.76
Each
units
Plunger Yes NC Snap - Screw Metal 1 2 M20 x 1.5 SP EX-ZS 335 38mm 66.5 x 40.5 x 38 mm
RS Stock No. 769-6279
Mfr. Part No.3SE5132-0CF05
BrandSiemens
MYR177.61
Each
units
Roller Lever Yes NO/NC Snap - Screw Plastic 1 2 M20 x 1.5 - 3SE5 78mm 40.5 x 37.3 x 78 mm
RS Stock No. 228-071
Mfr. Part No.3SE5242-0BC05
BrandSiemens
MYR125.84
Each
units
Plunger - NO/NC - IP66, IP67 Screw Plastic - - - - 3SE5 33mm 60.7 x 55.5 x 33 mm
RS Stock No. 746-7258
Mfr. Part No.D4N-412H
BrandOmron
MYR174.56
Each
units
Roller Lever Yes NO/NC Snap - Screw - - 2 M20 DPST D4N 48.2mm 64 x 31 x 48.2 mm
RS Stock No. 411-3021
Mfr. Part No.3SE2243-0XX40
BrandSiemens
MYR198.70
Each
units
- - NO/NC Slow IP65 Screw Fibreglass 3 3 M20 x 1.5 - 3SE5 30mm 90 x 52 x 30 mm
RS Stock No. 766-1615
Mfr. Part No.XCSD3902P20
MYR216.64
Each
units
Roller Plunger Yes NO/2NC Snap - Cable Metal 1 3 M20 x 1.5 3P XCSD 35mm 100 x 34 x 35 mm
RS Stock No. 498-955
Mfr. Part No.3SE5232-0FC05
BrandSiemens
MYR102.66
Each
units
Plunger Yes NO/NC Snap IP65 Screw Plastic 1 2 M20 x 1.5 - 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 768-6507
Mfr. Part No.3SE5122-0CA00
BrandSiemens
MYR146.53
Each
units
Round Plunger - NO/NC Snap - Screw Metal 3 2 M20 x 1.5 - 3SE5 78mm 56 x 37.8 x 78 mm
RS Stock No. 410-7363
Mfr. Part No.I88-SU1Z W
MYR113.77
Each
units
Radius Yes NO/NC Snap IP65 Screw Fibreglass 1 2 M20 x 1.5 - I88 SU/U 30.5mm 62 x 22 x 30.5 mm
RS Stock No. 764-3427
Mfr. Part No.D4B-4113N
BrandOmron
MYR410.81
Each
units
Roller Lever Yes NO/NC Snap IP67 Screw Die Cast Aluminium - 2 - DPST D4B-N 56mm 99.5 x 40 x 56 mm
RS Stock No. 228-087
Mfr. Part No.3SE5242-0HC05
BrandSiemens
MYR120.05
Each
units
Plunger - NO/NC - IP66, IP67 Screw Plastic - - - - 3SE5 33mm 60.7 x 55.5 x 33 mm
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