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. 136-3202
Mfr. Part No.6089152048
HK$169.34
Each
units
Plunger Yes NO/NC Snap IP67 Cable Polymeric 1 2 - SPST I49 60mm 30 x 16 x 60 mm
RS Stock No. 179-7565
BrandRS PRO
HK$173.81
Each
units
Cat Whisker Yes NO/NC Snap IP67 - Glass Fibre Reinforced Plastic - - - - - 172mm 31 x 31 x 172 mm
RS Stock No. 302-0041
Mfr. Part No.XCLJ565H29
HK$720.86
Each
units
Roller Plunger Yes NO/NC Slow IP66 Screw Metal 1 2 20 mm - XCL-J 63.6mm 100 x 40 x 63.6 mm
RS Stock No. 749-7565
Mfr. Part No.3SE5112-0BE01
BrandSiemens
HK$385.34
Each
units
Roller Lever Yes NO/NC - IP66, IP67 Screw Metal - - - DPST 3SE5 37.3mm 85.7 x 40.5 x 37.3 mm
RS Stock No. 133-0064
Mfr. Part No.XCSM3702L5
HK$684.61
Each
units
Roller Plunger Yes NO/2NC Slow IP66, IP67, IP68 Cable Metal 1 3 - 3P XCSM 70.4mm 30 x 16 x 70.4 mm
RS Stock No. 768-6336
Mfr. Part No.3SE5132-0CA00
BrandSiemens
HK$157.00
Each
units
Round Plunger - NO/NC Snap - Screw Plastic 1 2 M20 x 1.5 - 3SE5 78mm 40.5 x 37.3 x 78 mm
RS Stock No. 769-6251
Mfr. Part No.3SE5212-0CK21
BrandSiemens
HK$289.55
Each
units
Twist Lever Yes NO/NC Snap - Screw Metal 1 2 M20 x 1.5 - 3SE5 68mm 31 x 33 x 68 mm
RS Stock No. 755-7897
Mfr. Part No.3SE5423-0CC22-1EA2
BrandSiemens
HK$482.73
Each
units
Round Plunger Yes NO/NC Snap - Cable - - 2 5 x 0.75 mm² DPST 3SE5 16mm 50 x 40 x 16 mm
RS Stock No. 755-7856
Mfr. Part No.3SE5413-0CC20-1EA2
BrandSiemens
HK$336.43
Each
units
Round 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. 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. 768-6503
Mfr. Part No.3SE5122-0PA00
BrandSiemens
HK$230.00
Each
units
Round Plunger - 2NO/NC Slow - Screw Metal 3 3 M20 x 1.5 - 3SE5 78mm 56 x 37.8 x 78 mm
RS Stock No. 132-9176
Mfr. Part No.XCSPL772
HK$383.10
Each
units
Elbowed Flush Lever Yes 2NC Slow IP67 M16 Nylon 66, Plastic 1 2 M16 x 1.5 DP XCSPL 88mm 30 x 103 x 88 mm
RS Stock No. 769-6740
Mfr. Part No.3SE5250-0BC05
BrandSiemens
HK$154.70
Each
units
Plunger Yes NO/NC Slow - Screw Plastic - 2 - - 3SE5 48.5mm 30 x 20 x 48.5 mm
RS Stock No. 258-8164
Mfr. Part No.GSAC04D
BrandHoneywell
HK$877.52
Each
units
Roller Arm Yes NO/NC Slow - Screw Metal - 2 M20 x 1.5 DP GSS 42mm 141 x 42 x 42 mm
RS Stock No. 621-1565
Mfr. Part No.D4N-1A2H
BrandOmron
HK$254.76
Each
units
Roller Lever Yes NO/NC Slow IP67 Screw - - 2 - SPDT D4N - -
RS Stock No. 410-7414
Mfr. Part No.I88-SU1Z HW
HK$198.51
Each
units
Roller Lever 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. 755-7904
Mfr. Part No.3SE5423-0CD21-1EA2
BrandSiemens
HK$573.23
Each
units
Roller Plunger Yes NO/NC Snap - Cable - - 2 5 x 0.75 mm² DPST 3SE5 16mm 50 x 40 x 16 mm
RS Stock No. 749-7606
Mfr. Part No.3SE5112-0LA00
BrandSiemens
HK$253.65
Each
units
- - NO/2NC - IP66, IP67 Screw Metal - - - 3PST 3SE5 37.3mm 85.7 x 40.5 x 37.3 mm
RS Stock No. 749-7580
Mfr. Part No.3SE5112-0CC02
BrandSiemens
HK$354.65
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. 302-0057
Mfr. Part No.XCLJ761H29
HK$616.59
Each
units
Plunger Yes 2NC Slow IP66 Screw Metal 1 2 20 mm - XCL-J 40mm 107 x 44 x 40 mm
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