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. 179-7565
BrandRS PRO
HK$213.10
Each
units
Cat Whisker Yes NO/NC Snap IP67 - Glass Fibre Reinforced Plastic - - - - - 172mm 31 x 31 x 172 mm
RS Stock No. 179-7562
BrandRS PRO
HK$236.78
Each
units
- - 2NC Slow IP67 Screw Plastic - - - - - 95mm 31 x 31 x 95 mm
RS Stock No. 133-0058
Mfr. Part No.XCSPL962
HK$494.25
Each
units
Straight Lever Yes NO/2NC Slow IP67 M16 Nylon 66, Plastic 1 3 M16 x 1.5 3P XCSPL 161mm 30 x 30 x 161 mm
RS Stock No. 749-7672
Mfr. Part No.3SE5232-0KD03
BrandSiemens
HK$229.03
Each
units
Roller Plunger Yes NO/2NC - IP65 Screw Plastic - - - 3PST 3SE5 33mm 75.7 x 31 x 33 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
RS Stock No. 768-6503
Mfr. Part No.3SE5122-0PA00
BrandSiemens
HK$263.46
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. 768-6434
Mfr. Part No.3SE5212-0MC05
BrandSiemens
HK$225.94
Each
units
Round Plunger Yes NO/2NC Slow - Screw Metal 1 3 M20 x 1.5 - 3SE5 68mm 31 x 33 x 68 mm
RS Stock No. 410-7414
Mfr. Part No.I88-SU1Z HW
HK$249.89
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. 746-7264
Mfr. Part No.D4N-4162
BrandOmron
HK$222.24
Each
units
Roller Lever Yes NO/NC Snap - Screw - - 2 M20 DPST D4N 31.5mm 64 x 31 x 31.5 mm
RS Stock No. 768-6424
Mfr. Part No.3SE5242-0HC05-1AJ0
BrandSiemens
HK$309.11
Each
units
Round Plunger Yes NO/NC Snap - Screw Plastic 1 2 M20 x 1.5 - 3SE5 53mm 50 x 33 x 53 mm
RS Stock No. 749-7616
Mfr. Part No.3SE5122-0BE01
BrandSiemens
HK$400.51
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. 755-7913
Mfr. Part No.3SE5423-0CN20-1EA2
BrandSiemens
HK$510.11
Each
units
Twist Lever Yes NO/NC Snap - Cable - - 2 5 x 0.75 mm² DPST 3SE5 16mm 50 x 40 x 16 mm
RS Stock No. 136-3209
Mfr. Part No.6097152055
HK$2,519.32
Each
units
Push Bolt Yes NO/NC - IP66, IP67 Cable Gland Die Cast Aluminium 1 2 M20 x 1.5 SPST ENM2-EX 101mm 40 x 42 x 101 mm
RS Stock No. 621-1565
Mfr. Part No.D4N-1A2H
BrandOmron
HK$262.46
Each
units
Roller Lever Yes NO/NC Slow IP67 Screw - - 2 - SPDT D4N - -
RS Stock No. 766-1728
Mfr. Part No.XCSM4110L1
HK$597.70
Each
units
Plunger Yes 2NO/2NC Snap - Cable Metal - 4 - 4P XCSM 16mm 60 x 30 x 16 mm
RS Stock No. 179-7563
BrandRS PRO
HK$236.78
Each
units
- - NO/NC Slow IP67 Screw Plastic - - - - - 95mm 31 x 31 x 95 mm
RS Stock No. 768-6474
Mfr. Part No.3SE5112-0CA00
BrandSiemens
HK$248.71
Each
units
Round Plunger - NO/NC Snap - Screw Metal 1 2 M20 x 1.5 - 3SE5 78mm 40.5 x 37.3 x 78 mm
RS Stock No. 136-3196
Mfr. Part No.6086836131
HK$460.23
Each
units
Lever, Roller Yes 2NC - IP65 Screw Thermoplastic 1 2 M20 x 1.5 DPST I88 94.5mm 31 x 47 x 94.5 mm
RS Stock No. 258-8085
Mfr. Part No.GSAC01B
BrandHoneywell
HK$1,019.99
Each
units
Plunger Yes NO/NC Snap - Screw Metal - 2 M20 x 1.5 DP GSS 55.9mm 145.8 x 42 x 55.9 mm
RS Stock No. 410-7111
Mfr. Part No.C2-U1Z
HK$135.14
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
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