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. 768-6361
Mfr. Part No.3SE5242-0KC05
BrandSiemens
HK$212.56
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. 132-9970
Mfr. Part No.XCSPL582
HK$363.65
Each
units
Elbowed Flush Lever Yes NO/NC Slow IP67 M16 Nylon 66, Plastic 1 2 M16 x 1.5 DP XCSPL 161mm 30 x 30 x 161 mm
RS Stock No. 768-6516
Mfr. Part No.3SE5122-0BA00
BrandSiemens
HK$259.23
Each
units
Round Plunger - NO/NC Slow - Screw Metal 3 2 M20 x 1.5 - 3SE5 78mm 56 x 37.8 x 78 mm
RS Stock No. 757-9156
Mfr. Part No.D4B-4171N
BrandOmron
HK$337.87
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. 293-7011
Mfr. Part No.GSAC06C
BrandHoneywell
HK$1,188.50
Each
units
Plunger Yes NO/NC Snap - Screw Metal - 2 M20 x 1.5 DP GSS 42mm 141 x 42 x 42 mm
RS Stock No. 814-7961
Mfr. Part No.XCSM3710L2
HK$1,713.28
Each
units
Plunger Yes NO/2NC Slow IP66, IP67, IP68 Pre-Cabled Metal 1 3 7 x 0.5 mm² 3P XCSM 60mm 30 x 16 x 60 mm
RS Stock No. 410-6972
Mfr. Part No.C2-SU1Z R
HK$153.68
Each
units
Roller Tappet Yes NO/NC Snap IP20 Screw Fibreglass 1 2 8.5 x 3.5 mm - C2 21mm 44 x 26 x 21 mm
RS Stock No. 836-2747
Mfr. Part No.D4N1A62
BrandOmron
HK$266.78
Each
units
One Way Roller Arm Lever Yes NO/NC Slow IP67 Screw - 1 2 PG13.5 DPST D4N 92mm 31 x 31.5 x 92 mm
RS Stock No. 766-1712
Mfr. Part No.XCSM3915L1
HK$484.50
Each
units
Rotary Lever Yes NO/2NC Snap - Cable Metal - 3 - 3P XCSM 34mm 94 x 30 x 34 mm
RS Stock No. 749-7707
Mfr. Part No.3SE5413-0CD20-1EA5
BrandSiemens
HK$509.42
Each
units
Roller Plunger Yes NO/NC - IP67 M12 Metal - - - DPST 3SE5 16.2mm 50 x 30 x 16.2 mm
RS Stock No. 749-7612
Mfr. Part No.3SE5122-0BB01
BrandSiemens
HK$315.52
Each
units
Plunger Yes NO/NC - IP66, IP67 Screw Metal - - - DPST 3SE5 37.8mm 85.7 x 56 x 37.8 mm
RS Stock No. 136-3191
Mfr. Part No.6086803013
HK$294.71
Each
units
Plunger Yes 2NC - IP65 Screw Thermoplastic 1 2 M20 x 1.5 DPST I88 74mm 31 x 30.5 x 74 mm
RS Stock No. 411-3021
Mfr. Part No.3SE2243-0XX40
BrandSiemens
HK$338.85
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. 258-8158
Mfr. Part No.GSAC04C
BrandHoneywell
HK$1,012.44
Each
units
Plunger Yes NO/NC Snap - Screw Metal - 2 M20 x 1.5 DP GSS 42mm 141 x 42 x 42 mm
RS Stock No. 768-6507
Mfr. Part No.3SE5122-0CA00
BrandSiemens
HK$248.71
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. 293-6989
Mfr. Part No.GSAC06A1B
BrandHoneywell
HK$976.98
Each
units
Roller, Rotary Yes 2NC Snap - Screw Metal - 2 M20 x 1.5 DP GSS 55.9mm 145.8 x 42 x 55.9 mm
RS Stock No. 769-6746
Mfr. Part No.3SE5250-0MC05
BrandSiemens
HK$177.78
Each
units
Plunger Yes NO/2NC Slow - Screw Plastic - 3 - - 3SE5 48.5mm 30 x 20 x 48.5 mm
RS Stock No. 769-6743
Mfr. Part No.3SE5250-0PC05
BrandSiemens
HK$177.78
Each
units
Plunger Yes 2NO/NC Slow - Screw Plastic - 3 - - 3SE5 48.5mm 30 x 20 x 48.5 mm
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