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. 749-7625
Mfr. Part No.3SE5122-0CB01
BrandSiemens
HK$296.03
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. 410-7111
Mfr. Part No.C2-U1Z
HK$114.98
Each
units
Radius Yes NO/NC Slow IP20 Screw Fibreglass 1 2 8.5 x 3.5 mm - C2 21mm 44 x 26 x 21 mm
RS Stock No. 746-7245
Mfr. Part No.D4N-4122
BrandOmron
HK$225.51
Each
units
Roller Lever Yes NO/NC Snap - Screw - - 2 M20 DPST D4N 45mm 64 x 31 x 45 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. 410-7436
Mfr. Part No.I88-SU1Z AH
HK$277.45
Each
units
Spindle 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. 177-9025
Mfr. Part No.SHS3-U15Z-KA5-L-IPX
HK$1,506.46
Each
units
- - NO/2NC - IP69K Wire Lead PBT 1 3 - - SHS3 137mm 82 x 19.5 x 137 mm
RS Stock No. 749-7656
Mfr. Part No.3SE5232-0BE10
BrandSiemens
HK$234.81
Each
units
Roller Lever Yes NO/NC - IP65 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 768-6367
Mfr. Part No.3SE5242-1LC05
BrandSiemens
HK$320.00
Each
units
Round Plunger Yes NO/2NC Snap - Screw Plastic 2 3 M20 x 1.5 - 3SE5 53mm 50 x 33 x 53 mm
RS Stock No. 179-9878
Mfr. Part No.XCSA522
HK$1,030.59
Each
units
- - 2NO/NC - IP67 M20 Metal 1 3 M20 3P XCSA 114mm 40 x 44 x 114 mm
RS Stock No. 755-7878
Mfr. Part No.3SE5413-0CD21-1EA2
BrandSiemens
HK$498.41
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. 410-6887
Mfr. Part No.ENM2-U1 AD
HK$434.65
Each
units
- - - - - - - - - - - - - -
RS Stock No. 136-3160
Mfr. Part No.6008801003
HK$174.77
Each
units
Plunger Yes 2NC - IP20, IP30 Screw Thermoplastic 1 2 8.5 x 3.5 DPST C2 44mm 26 x 21 x 44 mm
RS Stock No. 179-7568
BrandRS PRO
HK$162.94
Each
units
Plunger Yes NO/NC Snap IP67 - Glass Fibre Reinforced Plastic - - - - - 74.5mm 31 x 31 x 74.5 mm
RS Stock No. 177-9026
Mfr. Part No.SK-BETZTIGER M3
HK$16.08
Each
units
- - - - - - - - - - - - - -
RS Stock No. 757-9152
Mfr. Part No.D4B4117N
BrandOmron
HK$585.58
Each
units
Rod Lever Yes NO/NC Snap - Screw Metal 1 2 M20 DPST D4B-N 43mm 99.5 x 40 x 43 mm
RS Stock No. 749-7662
Mfr. Part No.3SE5232-0HF10
BrandSiemens
HK$225.38
Each
units
Roller Lever Yes NO/NC - IP65 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 258-8259
Mfr. Part No.GSAC21C
BrandHoneywell
HK$1,009.08
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. 768-6241
Mfr. Part No.3SE5232-0LC05
BrandSiemens
HK$152.50
Each
units
Round Plunger Yes NO/2NC Snap - Screw Plastic 1 3 M20 x 1.5 - 3SE5 68mm 31 x 33 x 68 mm
RS Stock No. 132-9173
Mfr. Part No.XCSP3902P20
HK$275.68
Each
units
Roller Plunger Yes NO/2NC Snap IP66, IP67 M20 Plastic 1 3 M20 x 1.5 3P XCSP 100mm 34 x 35 x 100 mm
RS Stock No. 258-8120
Mfr. Part No.GSAC04A1B
BrandHoneywell
HK$829.45
Each
units
Roller, Rotary Yes NO/NC Snap - Screw Metal - 2 M20 x 1.5 DP GSS 55.9mm 145.8 x 42 x 55.9 mm
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