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. 768-6516
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. 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. 749-7644
Mfr. Part No.3SE5212-0CC05
BrandSiemens
HK$219.88
Each
units
Plunger Yes NO/NC - IP66, IP67 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 769-6229
Mfr. Part No.3SE5242-0HD03
BrandSiemens
HK$248.71
Each
units
Roller Plunger Yes NO/NC Snap - Screw Plastic 2 2 M20 x 1.5 - 3SE5 53mm 50 x 33 x 53 mm
RS Stock No. 755-7904
Mfr. Part No.3SE5423-0CD21-1EA2
BrandSiemens
HK$560.67
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. 136-3199
Mfr. Part No.6087835015
HK$486.78
Each
units
Lever, Roller Yes 2NC - IP65 Screw Die Cast Aluminium 1 2 M20 x 1.5 DPST ENM2 125.5mm 40 x 61 x 125.5 mm
RS Stock No. 498-961
Mfr. Part No.3SE5112-0BA00
BrandSiemens
HK$260.46
Each
units
- - NO/NC Slow - Screw Metal 1 2 M20 x 1.5 DP 3SE5 37.3mm 85.7 x 40.5 x 37.3 mm
RS Stock No. 757-9156
Mfr. Part No.D4B-4171N
BrandOmron
HK$345.29
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. 179-9879
Mfr. Part No.XCSA712
HK$2,663.28
Each
units
- - NO/2NC - IP67 M20 Metal 1 3 M20 3P XCSA 114mm 40 x 44 x 114 mm
RS Stock No. 749-7688
Mfr. Part No.3SE5234-0HD03-1AC4
BrandSiemens
HK$356.24
Each
units
Roller Plunger Yes NO/NC - IP65 M12 Plastic - - - 4PST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 133-0065
Mfr. Part No.XCSM3915L5
HK$597.00
Each
units
Rotary Lever Yes NO/2NC Snap IP66, IP67, IP68 Cable Metal 1 3 - 3P XCSM 94mm 30 x 32.4 x 94 mm
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. 179-7566
BrandRS PRO
HK$213.10
Each
units
Roller Arm Lever Yes NO/NC Snap IP67 - Glass Fibre Reinforced Plastic - - - - - 89mm 31 x 31 x 89 mm
RS Stock No. 755-7859
Mfr. Part No.3SE5413-0CC20-1EB1
BrandSiemens
HK$415.27
Each
units
Round Plunger Yes NO/NC Snap - M12 - - 2 - DPST 3SE5 16.2mm 50 x 30 x 16.2 mm
RS Stock No. 749-7565
Mfr. Part No.3SE5112-0BE01
BrandSiemens
HK$400.51
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. 410-7262
Mfr. Part No.C2-A2Z ST.
HK$163.80
Each
units
Plunger Yes 2NC Slow IP20 Screw Fibreglass 1 2 8.5 x 3.5 mm - C2 21mm 44 x 26 x 21 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. 621-1537
Mfr. Part No.D4N-1131
BrandOmron
HK$189.98
Each
units
Plunger Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 30mm 73.2 x 31 x 30 mm
RS Stock No. 410-7341
Mfr. Part No.C2-SU1Z
HK$138.42
Each
units
Radius 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. 814-7968
Mfr. Part No.XCSM3716L2
HK$1,806.72
Each
units
Roller Lever Yes NO/2NC Slow IP66, IP67, IP68 Pre-Cabled Metal 1 3 7 x 0.5 mm² 3P XCSM 94mm 30 x 32.4 x 94 mm
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