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. 746-7245
Mfr. Part No.D4N-4122
BrandOmron
$87.60
Each
units
Roller Lever Yes NO/NC Snap - Screw - - 2 M20 DPST D4N 45mm 64 x 31 x 45 mm
RS Stock No. 621-1543
Mfr. Part No.D4N-1132
BrandOmron
$55.29
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. 621-1537
Mfr. Part No.D4N-1131
BrandOmron
$60.72
Each
units
Plunger Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 30mm 73.2 x 31 x 30 mm
RS Stock No. 746-7249
Mfr. Part No.D4N-412G
BrandOmron
$89.03
Each
units
Roller Lever Yes NO/NC Snap - Screw - - 2 M20 DPST D4N 45mm 64 x 31 x 45 mm
RS Stock No. 621-1515
Mfr. Part No.D4N-1120
BrandOmron
$78.65
Each
units
Roller Lever Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 47mm 73 x 31 x 47 mm
RS Stock No. 836-2753
Mfr. Part No.D4N8131
BrandOmron
$43.50
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. 746-7270
Mfr. Part No.D4N-4187
BrandOmron
$78.20
Each
units
Plastic Rod Yes NO/NC Snap - Screw - - 2 - DPST D4N 31.5mm 64 x 31 x 31.5 mm
RS Stock No. 836-2750
Mfr. Part No.D4N4A32
BrandOmron
$55.78
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. 746-7264
Mfr. Part No.D4N-4162
BrandOmron
$63.46
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. 746-7273
Mfr. Part No.D4N-4A2G
BrandOmron
$105.16
Each
units
Roller Lever Yes NO/NC Slow - Screw - - 2 M20 DPST D4N 45mm 64 x 31 x 45 mm
RS Stock No. 746-7251
Mfr. Part No.D4N-4131
BrandOmron
$59.56
Each
units
Plunger Yes NO/NC Snap - Screw - - 2 M20 DPST D4N 31.5mm 64 x 31 x 31.5 mm
RS Stock No. 757-9156
Mfr. Part No.D4B-4171N
BrandOmron
$101.60
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. 621-1521
Mfr. Part No.D4N-112G
BrandOmron
$89.32
Each
units
Roller Lever Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 45mm 73 x 31 x 45 mm
RS Stock No. 746-7242
Mfr. Part No.D4N-4120
BrandOmron
$69.90
Each
units
Roller Lever Yes NO/NC Snap - Screw - - 2 M20 DPST D4N 47mm 64 x 31 x 47 mm
RS Stock No. 746-7261
Mfr. Part No.D4N-4180
BrandOmron
$94.01
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. 746-7233
Mfr. Part No.D4N-1A2G
BrandOmron
$89.42
Each
units
Roller Lever Yes NO/NC Slow - Screw - - 2 PG13.5 DPST D4N 45mm 64 x 31 x 45 mm
RS Stock No. 746-7267
Mfr. Part No.D4N-4172
BrandOmron
$50.88
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. 836-2731
Mfr. Part No.D4B4A11N
BrandOmron
$168.73
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. 861-4648
Mfr. Part No.D4N-2187
BrandOmron
$67.02
Each
units
Rod Yes NO/NC Snap IP67 M20 - - 2 - DPST D4N 170mm 31 x 31.5 x 170 mm
RS Stock No. 836-2741
Mfr. Part No.D4N4A31
BrandOmron
$61.95
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