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. 410-7357
Mfr. Part No.I88-U1Z W
$42.14
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. 749-7631
Mfr. Part No.3SE5122-0CE01
BrandSiemens
$71.05
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. 757-9140
Mfr. Part No.D4B4111N
BrandOmron
$133.41
Each
units
Roller Lever Yes NO/NC Snap - Screw Metal 1 2 M20 DPST D4B-N 43mm 99.5 x 40 x 43 mm
RS Stock No. 768-6507
Mfr. Part No.3SE5122-0CA00
BrandSiemens
$52.11
Each
units
Round Plunger - NO/NC Snap - Screw Metal 3 2 M20 x 1.5 - 3SE5 78mm 56 x 37.8 x 78 mm
RS Stock No. 836-2750
Mfr. Part No.D4N4A32
BrandOmron
$39.05
Each
units
Top Roller Plunger Yes NO/NC Slow IP67 Screw - 1 2 M20 DPST D4N 83.6mm 31 x 31.5 x 83.6 mm
RS Stock No. 766-1627
Mfr. Part No.XCSD3918P20
$143.17
Each
units
Rotary Lever Yes NO/2NC Snap - Cable Metal 1 3 M20 x 1.5 3P XCSD 35mm 122 x 34 x 35 mm
RS Stock No. 746-7242
Mfr. Part No.D4N-4120
BrandOmron
$61.17
Each
units
Roller Lever Yes NO/NC Snap - Screw - - 2 M20 DPST D4N 47mm 64 x 31 x 47 mm
RS Stock No. 749-7565
Mfr. Part No.3SE5112-0BE01
BrandSiemens
$73.02
Each
units
Roller Lever Yes NO/NC - IP66, IP67 Screw Metal - - - DPST 3SE5 37.3mm 85.7 x 40.5 x 37.3 mm
RS Stock No. 749-7669
Mfr. Part No.3SE5232-0HE10
BrandSiemens
$42.71
Each
units
Roller Lever Yes NO/NC - IP65 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 198-560
Mfr. Part No.XCSD3919P20
$153.63
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. 755-7869
Mfr. Part No.3SE5413-0CD20-1EB1
BrandSiemens
$79.19
Each
units
Roller Plunger Yes NO/NC Snap - M12 - - 2 - DPST 3SE5 16.2mm 50 x 30 x 16.2 mm
RS Stock No. 746-7233
Mfr. Part No.D4N-1A2G
BrandOmron
$63.41
Each
units
Roller Lever Yes NO/NC Slow - Screw - - 2 PG13.5 DPST D4N 45mm 64 x 31 x 45 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. 410-7234
Mfr. Part No.C2-U1Z ST.
$25.46
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. 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. 258-8091
Mfr. Part No.GSAC01C
BrandHoneywell
$181.80
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. 410-7436
Mfr. Part No.I88-SU1Z AH
$65.21
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. 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. 749-7583
Mfr. Part No.3SE5112-0CD02
BrandSiemens
$122.87
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. 749-7697
Mfr. Part No.3SE5250-0CC05
BrandSiemens
$30.59
Each
units
Plunger Yes NO/NC - IP20 Screw Plastic - - - DPST 3SE5 27.8mm 42.5 x 30 x 27.8 mm
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