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. 410-7329
Mfr. Part No.I88-U1 AV
$67.70
Each
units
Spindle Yes NO/NC Slow IP65 Screw Fibreglass 1 2 M20 x 1.5 - I88 SU/U 30.5mm 62 x 22 x 30.5 mm
RS Stock No. 746-7245
Mfr. Part No.D4N-4122
BrandOmron
$86.81
Each
units
Roller Lever Yes NO/NC Snap - Screw - - 2 M20 DPST D4N 45mm 64 x 31 x 45 mm
RS Stock No. 749-7603
Mfr. Part No.3SE5112-0KC02
BrandSiemens
$125.25
Each
units
Plunger Yes NO/2NC - IP66, IP67 Screw Metal - - - 3PST 3SE5 37.3mm 85.7 x 40.5 x 37.3 mm
RS Stock No. 749-7666
Mfr. Part No.3SE5232-0HK21
BrandSiemens
$69.63
Each
units
Twist Lever Yes NO/NC - IP65 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 621-1543
Mfr. Part No.D4N-1132
BrandOmron
$54.79
Each
units
Roller Plunger Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 31.5mm 83.6 x 31 x 31.5 mm
RS Stock No. 410-7357
Mfr. Part No.I88-U1Z W
$46.52
Each
units
Radius Yes NO/NC Slow IP65 Screw Fibreglass 1 2 M20 x 1.5 - I88 SU/U 30.5mm 62 x 22 x 30.5 mm
RS Stock No. 769-6257
Mfr. Part No.3SE5212-0CF10
BrandSiemens
$81.81
Each
units
Roller Lever Yes NO/NC Snap - Screw Metal 1 2 M20 x 1.5 - 3SE5 68mm 31 x 33 x 68 mm
RS Stock No. 621-1537
Mfr. Part No.D4N-1131
BrandOmron
$60.17
Each
units
Plunger Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 30mm 73.2 x 31 x 30 mm
RS Stock No. 198-560
Mfr. Part No.XCSD3919P20
$176.42
Each
units
Roller Lever Yes NO/2NC Snap IP66, IP67 Cable Plastic 1 3 M20 x 1.5 - XCSD 35mm 122 x 34 x 35 mm
RS Stock No. 766-1700
Mfr. Part No.XCSM3902L1
$245.55
Each
units
Roller Plunger Yes NO/2NC Snap - Cable Metal - 3 - 3P XCSM 16mm 70 x 30 x 16 mm
RS Stock No. 766-1725
Mfr. Part No.XCSM4102L1
$213.04
Each
units
Roller Plunger Yes 2NO/2NC Snap - Cable Metal - 4 - 4P XCSM 16mm 70 x 30 x 16 mm
RS Stock No. 746-7249
Mfr. Part No.D4N-412G
BrandOmron
$88.23
Each
units
Roller Lever Yes NO/NC Snap - Screw - - 2 M20 DPST D4N 45mm 64 x 31 x 45 mm
RS Stock No. 766-1731
Mfr. Part No.XCSM4116L1
$222.57
Each
units
Rotary Lever Yes 2NO/2NC Snap - Cable Metal - 4 - 4P XCSM 34mm 94 x 30 x 34 mm
RS Stock No. 479-3043
Mfr. Part No.XCSM3902L5
$572.65
Each
units
Roller Plunger Yes NO/2NC Snap IP67, IP68 Cable Metal - 3 - - XCSM 16mm 70 x 30 x 16 mm
RS Stock No. 766-1728
Mfr. Part No.XCSM4110L1
$445.66
Each
units
Plunger Yes 2NO/2NC Snap - Cable Metal - 4 - 4P XCSM 16mm 60 x 30 x 16 mm
RS Stock No. 410-7420
Mfr. Part No.I88-U1Z AH
$62.47
Each
units
Spindle Yes NO/NC Slow IP65 Screw Fibreglass 1 2 M20 x 1.5 - I88 SU/U 30.5mm 62 x 22 x 30.5 mm
RS Stock No. 698-8776
Mfr. Part No.EX-ZS 335-02Z-3G/D
BrandSchmersal
$179.91
Each
units
Plunger Yes NC Snap - Screw Metal 1 2 M20 x 1.5 SP EX-ZS 335 38mm 66.5 x 40.5 x 38 mm
RS Stock No. 749-7580
Mfr. Part No.3SE5112-0CC02
BrandSiemens
$117.74
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. 769-6263
Mfr. Part No.3SE5132-0CC03
BrandSiemens
$74.90
Each
units
Round Plunger Yes NO/NC Snap - Screw Plastic 1 2 M20 x 1.5 - 3SE5 78mm 40.5 x 37.3 x 78 mm
RS Stock No. 621-1515
Mfr. Part No.D4N-1120
BrandOmron
$55.59
Each
units
Roller Lever Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 47mm 73 x 31 x 47 mm
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