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. 198-560
Mfr. Part No.XCSD3919P20
$158.94
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. 410-6972
Mfr. Part No.C2-SU1Z R
$29.71
Each
units
Roller Tappet 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
$62.80
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. 755-7869
Mfr. Part No.3SE5413-0CD20-1EB1
BrandSiemens
$113.02
Each
units
Roller Plunger Yes NO/NC Snap - M12 - - 2 - DPST 3SE5 16.2mm 50 x 30 x 16.2 mm
RS Stock No. 258-8091
Mfr. Part No.GSAC01C
BrandHoneywell
$192.07
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. 621-1559
Mfr. Part No.D4N-1162
BrandOmron
$57.92
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. 410-7234
Mfr. Part No.C2-U1Z ST.
$25.91
Each
units
Plunger 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. 746-7233
Mfr. Part No.D4N-1A2G
BrandOmron
$80.56
Each
units
Roller Lever Yes NO/NC Slow - Screw - - 2 PG13.5 DPST D4N 45mm 64 x 31 x 45 mm
RS Stock No. 749-7583
Mfr. Part No.3SE5112-0CD02
BrandSiemens
$118.32
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. 410-7363
Mfr. Part No.I88-SU1Z W
$42.20
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. 746-7273
Mfr. Part No.D4N-4A2G
BrandOmron
$94.74
Each
units
Roller Lever Yes NO/NC Slow - Screw - - 2 M20 DPST D4N 45mm 64 x 31 x 45 mm
RS Stock No. 749-7697
Mfr. Part No.3SE5250-0CC05
BrandSiemens
$43.71
Each
units
Plunger Yes NO/NC - IP20 Screw Plastic - - - DPST 3SE5 27.8mm 42.5 x 30 x 27.8 mm
RS Stock No. 621-1543
Mfr. Part No.D4N-1132
BrandOmron
$49.81
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. 410-6988
Mfr. Part No.C2-U1Z R
$30.66
Each
units
Roller Tappet 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. 749-7628
Mfr. Part No.3SE5122-0CC02
BrandSiemens
$106.07
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. 836-2731
Mfr. Part No.D4B4A11N
BrandOmron
$93.37
Each
units
Roller Lever Yes 2NC Slow IP67 Screw Metal 1 - M20 - D4B 131.3mm 40 x 62 x 131.3 mm
RS Stock No. 766-1700
Mfr. Part No.XCSM3902L1
$221.22
Each
units
Roller Plunger Yes NO/2NC Snap - Cable Metal - 3 - 3P XCSM 16mm 70 x 30 x 16 mm
RS Stock No. 410-6916
Mfr. Part No.SK-U1Z M
$44.78
Each
units
Radius Yes NO/NC Slow IP65 Screw Fibreglass 3 2 M20 x 1.5 - ENM2 33.5mm 90 x 52 x 33.5 mm
RS Stock No. 410-7240
Mfr. Part No.ENM2-SU1 AD
$70.53
Each
units
- - - - - - - - - - - - - -
RS Stock No. 411-3021
Mfr. Part No.3SE2243-0XX40
BrandSiemens
$87.78
Each
units
- - NO/NC Slow IP65 Screw Fibreglass 3 3 M20 x 1.5 - 3SE5 30mm 90 x 52 x 30 mm
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