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. 749-7640
Mfr. Part No.3SE5162-0CE01
BrandSiemens
HK$843.13
Each
units
Roller Lever Yes 2NO/2NC - IP66, IP67 Screw Metal - - - 4PST 3SE5 37mm 107.7 x 56 x 37 mm
RS Stock No. 749-7669
Mfr. Part No.3SE5232-0HE10
BrandSiemens
HK$233.95
Each
units
Roller Lever Yes NO/NC - IP65 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 749-7650
Mfr. Part No.3SE5232-0HD03
BrandSiemens
HK$204.43
Each
units
Roller Plunger Yes NO/NC - IP65 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 749-7583
Mfr. Part No.3SE5112-0CD02
BrandSiemens
HK$454.63
Each
units
Plunger Yes NO/NC - IP66, IP67 Screw Metal - - - DPST 3SE5 37.3mm 85.7 x 40.5 x 37.3 mm
RS Stock No. 749-7599
Mfr. Part No.3SE5112-0CH50
BrandSiemens
HK$463.09
Each
units
Twist Lever Yes NO/NC - IP66, IP67 Screw Metal - - - DPST 3SE5 37.3mm 85.7 x 40.5 x 37.3 mm
RS Stock No. 768-6538
Mfr. Part No.3SE5162-0CA00
BrandSiemens
HK$701.96
Each
units
Round Plunger - 2NO/2NC Snap - Screw Metal 3 4 M20 x 1.5 - 3SE5 100mm 56 x 37 x 100 mm
RS Stock No. 749-7647
Mfr. Part No.3SE5132-0BA00
BrandSiemens
HK$180.87
Each
units
- - NO/NC - IP66, IP67 Screw Plastic - - - DPST 3SE5 37.3mm 85.7 x 40.5 x 37.3 mm
RS Stock No. 749-7631
Mfr. Part No.3SE5122-0CE01
BrandSiemens
HK$389.99
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. 768-6456
Mfr. Part No.3SE5214-0LC05-1AE1
BrandSiemens
HK$399.14
Each
units
Round Plunger Yes 2NC Snap - Screw Metal 1 2 M20 x 1.5 - 3SE5 68mm 31 x 33 x 68 mm
RS Stock No. 749-7666
Mfr. Part No.3SE5232-0HK21
BrandSiemens
HK$241.04
Each
units
Twist Lever Yes NO/NC - IP65 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 228-071
Mfr. Part No.3SE5242-0BC05
BrandSiemens
HK$213.58
Each
units
Plunger - NO/NC - IP66, IP67 Screw Plastic - - - - 3SE5 33mm 60.7 x 55.5 x 33 mm
RS Stock No. 755-7871
Mfr. Part No.3SE5413-0CD23-1EA2
BrandSiemens
HK$405.43
Each
units
Roller Plunger Yes NO/NC Snap - Cable - - 2 5 x 0.75 mm² DPST 3SE5 16.2mm 50 x 30 x 16.2 mm
RS Stock No. 749-7697
Mfr. Part No.3SE5250-0CC05
BrandSiemens
HK$167.94
Each
units
Plunger Yes NO/NC - IP20 Screw Plastic - - - DPST 3SE5 27.8mm 42.5 x 30 x 27.8 mm
RS Stock No. 749-7653
Mfr. Part No.3SE5232-0BD03
BrandSiemens
HK$214.27
Each
units
Roller Plunger Yes NO/NC - IP65 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 228-087
Mfr. Part No.3SE5242-0HC05
BrandSiemens
HK$203.75
Each
units
Plunger - NO/NC - IP66, IP67 Screw Plastic - - - - 3SE5 33mm 60.7 x 55.5 x 33 mm
RS Stock No. 749-7701
Mfr. Part No.3SE5423-0CC20-1EA2
BrandSiemens
HK$472.93
Each
units
Plunger Yes NO/NC - IP67 M12 Metal - - - DPST 3SE5 16mm 50 x 40 x 16 mm
RS Stock No. 769-6245
Mfr. Part No.3SE5212-0CD03
BrandSiemens
HK$264.15
Each
units
Roller Plunger Yes NO/NC Snap - Screw Metal 1 2 M20 x 1.5 - 3SE5 68mm 31 x 33 x 68 mm
RS Stock No. 755-7875
Mfr. Part No.3SE5413-0CN20-1EA2
BrandSiemens
HK$425.11
Each
units
Twist Lever Yes NO/NC Snap - Cable - - 2 5 x 0.75 mm² DPST 3SE5 16.2mm 50 x 30 x 16.2 mm
RS Stock No. 768-6462
Mfr. Part No.3SE5112-0PA00
BrandSiemens
HK$263.46
Each
units
Round Plunger - 2NO/NC Slow - Screw Metal 1 3 M20 x 1.5 - 3SE5 78mm 40.5 x 37.3 x 78 mm
RS Stock No. 769-6257
Mfr. Part No.3SE5212-0CF10
BrandSiemens
HK$283.14
Each
units
Roller Lever Yes NO/NC Snap - Screw Metal 1 2 M20 x 1.5 - 3SE5 68mm 31 x 33 x 68 mm