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. 768-6336
Mfr. Part No.3SE5132-0CA00
BrandSiemens
MYR93.18
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. 749-7577
Mfr. Part No.3SE5112-0BH01
BrandSiemens
MYR235.43
Each
units
Twist Lever Yes NO/NC - IP66, IP67 Screw Metal - - - DPST 3SE5 37.3mm 85.7 x 40.5 x 37.3 mm
RS Stock No. 621-1559
Mfr. Part No.D4N-1162
BrandOmron
MYR129.97
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. 479-3037
Mfr. Part No.XCSM3902L2
MYR336.37
Each
units
Plunger Yes NO/2NC Snap IP67, IP68 Cable Metal - 3 - - XCSM 16mm 70 x 30 x 16 mm
RS Stock No. 410-7363
Mfr. Part No.I88-SU1Z W
MYR100.44
Each
units
Radius 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. 768-6503
Mfr. Part No.3SE5122-0PA00
BrandSiemens
MYR137.03
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. 755-7890
Mfr. Part No.3SE5423-0CC20-1EB1
BrandSiemens
MYR259.34
Each
units
Round Plunger Yes NO/NC Snap - M12 - - 2 - DPST 3SE5 16mm 50 x 40 x 16 mm
RS Stock No. 749-7638
Mfr. Part No.3SE5122-0CH80
BrandSiemens
MYR258.96
Each
units
Rod Yes NO/NC - IP65, IP67 Screw Metal - - - DPST 3SE5 37.8mm 85.7 x 56 x 37.8 mm
RS Stock No. 410-6994
Mfr. Part No.C2-SU1Z ST.
MYR85.04
Each
units
Plunger 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. 410-7436
Mfr. Part No.I88-SU1Z AH
MYR162.97
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. 755-7907
Mfr. Part No.3SE5423-0CD20-1EA2
BrandSiemens
MYR255.08
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. 136-3211
Mfr. Part No.6097185085
MYR1,344.01
Each
units
Lever, Roller Yes NO/NC - IP66, IP67 Cable Gland Die Cast Aluminium 1 2 M20 x 1.5 SPST ENM2-EX 134.5mm 40 x 61 x 134.5 mm
RS Stock No. 768-6456
Mfr. Part No.3SE5214-0LC05-1AE1
BrandSiemens
MYR207.60
Each
units
Round Plunger Yes 2NC Snap - Screw Metal 1 2 M20 x 1.5 - 3SE5 68mm 31 x 33 x 68 mm
RS Stock No. 311-0330
Mfr. Part No.GSAC46C
BrandHoneywell
MYR604.35
Each
units
Plunger Yes 4NC Slow - Screw Metal - 4 M20 x 1.5 4P GSS 42mm 141 x 42 x 42 mm
RS Stock No. 136-3212
Mfr. Part No.6097187095
MYR1,517.58
Each
units
Lever Yes NO/NC - IP66, IP67 Cable Gland Die Cast Aluminium 1 2 M20 x 1.5 SPST ENM2-EX 277.5mm 40 x 49 x 277.5 mm
RS Stock No. 621-1565
Mfr. Part No.D4N-1A2H
BrandOmron
MYR186.60
Each
units
Roller Lever Yes NO/NC Slow IP67 Screw - - 2 - SPDT D4N - -
RS Stock No. 769-6248
Mfr. Part No.3SE5162-0CD02
BrandSiemens
MYR476.49
Each
units
Roller Plunger Yes 2NO/2NC Snap - Screw Metal 3 4 M20 x 1.5 - 3SE5 100mm 56 x 37 x 100 mm
RS Stock No. 498-892
Mfr. Part No.3SE5250-0LC05
BrandSiemens
MYR95.12
Each
units
Plunger Yes 2NC/1NO Snap IP10 Screw Plastic - 3 - - 3SE5 27.8mm 59.2 x 30 x 27.8 mm
RS Stock No. 768-6241
Mfr. Part No.3SE5232-0LC05
BrandSiemens
MYR90.62
Each
units
Round Plunger Yes NO/2NC Snap - Screw Plastic 1 3 M20 x 1.5 - 3SE5 68mm 31 x 33 x 68 mm
New
RS Stock No. 195-1771
Mfr. Part No.XCSPA692
MYR203.41
Each
units
- - 1NC/1NO - IP67 Terminal Polyamide 1 1 M16 x 1.5 mm 2P XCSP 94mm 30 x 30 x 94 mm
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