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. 621-1543
Mfr. Part No.D4N-1132
BrandOmron
HK$187.23
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. 757-9159
Mfr. Part No.D4B4116N
BrandOmron
HK$486.43
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. 746-7255
Mfr. Part No.D4N-4132
BrandOmron
HK$211.39
Each
units
Roller Plunger Yes NO/NC Snap - Screw - - 2 M20 DPST D4N 31.5mm 64 x 31 x 31.5 mm
RS Stock No. 621-1521
Mfr. Part No.D4N-112G
BrandOmron
HK$273.83
Each
units
Roller Lever Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 45mm 73 x 31 x 45 mm
RS Stock No. 836-2744
Mfr. Part No.D4N1A32
BrandOmron
HK$185.35
Each
units
Top Roller Plunger Yes NO/NC Slow IP67 Screw - 1 2 PG13.5 DPST D4N 83.6mm 31 x 31.5 x 83.6 mm
RS Stock No. 836-2741
Mfr. Part No.D4N4A31
BrandOmron
HK$185.35
Each
units
Top Plunger Yes NO/NC Slow IP67 Screw - 1 2 M20 DPST D4N 73.2mm 31 x 31.5 x 73.2 mm
RS Stock No. 836-2753
Mfr. Part No.D4N8131
BrandOmron
HK$197.15
Each
units
Top Plunger Yes NO/NC Snap IP67 Screw - 1 2 M20 DPST D4N 65mm 59 x 31.5 x 65 mm
RS Stock No. 746-7233
Mfr. Part No.D4N-1A2G
BrandOmron
HK$308.76
Each
units
Roller Lever Yes NO/NC Slow - Screw - - 2 PG13.5 DPST D4N 45mm 64 x 31 x 45 mm
RS Stock No. 757-9140
Mfr. Part No.D4B4111N
BrandOmron
HK$404.94
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. 836-2747
Mfr. Part No.D4N1A62
BrandOmron
HK$237.93
Each
units
One Way Roller Arm Lever Yes NO/NC Slow IP67 Screw - 1 2 PG13.5 DPST D4N 92mm 31 x 31.5 x 92 mm
RS Stock No. 621-1565
Mfr. Part No.D4N-1A2H
BrandOmron
HK$254.76
Each
units
Roller Lever Yes NO/NC Slow IP67 Screw - - 2 - SPDT D4N - -
RS Stock No. 746-7273
Mfr. Part No.D4N-4A2G
BrandOmron
HK$308.76
Each
units
Roller Lever Yes NO/NC Slow - Screw - - 2 M20 DPST D4N 45mm 64 x 31 x 45 mm
RS Stock No. 746-7264
Mfr. Part No.D4N-4162
BrandOmron
HK$258.84
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. 621-1515
Mfr. Part No.D4N-1120
BrandOmron
HK$199.13
Each
units
Roller Lever Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 47mm 73 x 31 x 47 mm
RS Stock No. 621-1537
Mfr. Part No.D4N-1131
BrandOmron
HK$184.40
Each
units
Plunger Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 30mm 73.2 x 31 x 30 mm
RS Stock No. 757-9156
Mfr. Part No.D4B-4171N
BrandOmron
HK$345.29
Each
units
Roller Plunger Yes NO/NC Snap - Screw Metal 1 2 M20 DPST D4B-N 43mm 97 x 40 x 43 mm
RS Stock No. 746-7251
Mfr. Part No.D4N-4131
BrandOmron
HK$211.39
Each
units
Plunger Yes NO/NC Snap - Screw - - 2 M20 DPST D4N 31.5mm 64 x 31 x 31.5 mm
RS Stock No. 746-7261
Mfr. Part No.D4N-4180
BrandOmron
HK$276.97
Each
units
Cat's Whisker Yes NO/NC Snap - Screw - - 2 - DPST D4N 31.5mm 64 x 31 x 31.5 mm
RS Stock No. 836-2735
Mfr. Part No.D4N112H
BrandOmron
HK$235.75
Each
units
Adjust Roller Lever Yes NO/NC Snap IP67 Screw Metal 1 2 PG13.5 DPST D4N 82.5mm 31 x 48.2 x 82.5 mm
RS Stock No. 746-7249
Mfr. Part No.D4N-412G
BrandOmron
HK$293.52
Each
units
Roller Lever Yes NO/NC Snap - Screw - - 2 M20 DPST D4N 45mm 64 x 31 x 45 mm