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. 258-8265
Mfr. Part No.GSAC21D
BrandHoneywell
€111.29
Each
units
Roller Lever Yes 2NC/2NO Snap IP67 Screw Metal - 4 - DPDT GSS 42mm 141 x 42 x 42 mm
RS Stock No. 757-9152
Mfr. Part No.D4B4117N
BrandOmron
€58.56
Each
units
Rod Lever Yes NO/NC Snap - Screw Metal 1 2 M20 DPST D4B-N 43mm 99.5 x 40 x 43 mm
RS Stock No. 621-1515
Mfr. Part No.D4N-1120
BrandOmron
€24.09
Each
units
Roller Lever Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 47mm 73 x 31 x 47 mm
RS Stock No. 757-9140
Mfr. Part No.D4B4111N
BrandOmron
€53.03
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. 836-2735
Mfr. Part No.D4N112H
BrandOmron
€29.87
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. 621-1559
Mfr. Part No.D4N-1162
BrandOmron
€26.33
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. 749-7662
Mfr. Part No.3SE5232-0HF10
BrandSiemens
€26.59
Each
units
Roller Lever Yes NO/NC - IP65 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 621-1565
Mfr. Part No.D4N-1A2H
BrandOmron
€29.73
Each
units
Roller Lever Yes NO/NC Slow IP67 Screw - - 2 - SPDT D4N - -
RS Stock No. 746-7267
Mfr. Part No.D4N-4172
BrandOmron
€26.33
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. 274-7981
Mfr. Part No.GHG2622301R0007
BrandCEAG
€369.35
Each
units
- - NO/NC - - Screw Polyamide 2 2 M20 DP - 112mm 102 x 84 x 112 mm
RS Stock No. 410-7391
Mfr. Part No.I88-SU1Z RIWK
€25.36
Each
units
Roller Plunger 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. 410-7111
Mfr. Part No.C2-U1Z
€14.59
Each
units
Radius 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. 258-8215
Mfr. Part No.GSAC20D
BrandHoneywell
€116.49
Each
units
Roller Arm Yes 2NO/2NC Snap - Screw Metal - 4 M20 x 1.5 4P GSS 42mm 141 x 42 x 42 mm
RS Stock No. 621-1537
Mfr. Part No.D4N-1131
BrandOmron
€21.52
Each
units
Plunger Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 30mm 73.2 x 31 x 30 mm
RS Stock No. 749-7669
Mfr. Part No.3SE5232-0HE10
BrandSiemens
€26.59
Each
units
Roller Lever Yes NO/NC - IP65 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 746-7258
Mfr. Part No.D4N-412H
BrandOmron
€26.76
Each
units
Roller Lever Yes NO/NC Snap - Screw - - 2 M20 DPST D4N 48.2mm 64 x 31 x 48.2 mm
RS Stock No. 836-2750
Mfr. Part No.D4N4A32
BrandOmron
€21.52
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. 410-7329
Mfr. Part No.I88-U1 AV
€37.36
Each
units
Spindle 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. 258-8209
Mfr. Part No.GSAC20C
BrandHoneywell
€122.16
Each
units
Plunger Yes 2NO/2NC Snap - Screw Metal - 4 M20 x 1.5 4P GSS 42mm 141 x 42 x 42 mm
RS Stock No. 410-7234
Mfr. Part No.C2-U1Z ST.
€15.73
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
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