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. 410-7329
Mfr. Part No.I88-U1 AV
$48.89
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. 755-7871
Mfr. Part No.3SE5413-0CD23-1EA2
BrandSiemens
$73.93
Each
units
Roller Plunger Yes NO/NC Snap - Cable - - 2 5 x 0.75 mm² DPST 3SE5 16.2mm 50 x 30 x 16.2 mm
RS Stock No. 410-7408
Mfr. Part No.I88-U1Z-HW
$29.86
Each
units
Roller Lever 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. 757-9156
Mfr. Part No.D4B-4171N
BrandOmron
$91.53
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. 479-3037
Mfr. Part No.XCSM3902L2
$225.38
Each
units
Plunger Yes NO/2NC Snap IP67, IP68 Cable Metal - 3 - - XCSM 16mm 70 x 30 x 16 mm
RS Stock No. 769-6267
Mfr. Part No.3SE5132-0CD05
BrandSiemens
$49.94
Each
units
Roller Plunger Yes NO/NC Snap - Screw Plastic 1 2 M20 x 1.5 - 3SE5 78mm 40.5 x 37.3 x 78 mm
RS Stock No. 749-7593
Mfr. Part No.3SE5112-0CR01
BrandSiemens
$78.53
Each
units
Spring Rod Yes NO/NC - IP66, IP67 Screw Metal - - - DPST 3SE5 37.3mm 85.7 x 40.5 x 37.3 mm
RS Stock No. 749-7644
Mfr. Part No.3SE5212-0CC05
BrandSiemens
$37.70
Each
units
Plunger Yes NO/NC - IP66, IP67 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 768-6468
Mfr. Part No.3SE5112-0MA00
BrandSiemens
$47.97
Each
units
Round Plunger - NO/2NC Slow - Screw Metal 1 3 M20 x 1.5 - 3SE5 78mm 40.5 x 37.3 x 78 mm
RS Stock No. 228-245
Mfr. Part No.3SE5232-0BC05
BrandSiemens
$31.12
Each
units
Plunger - NO/NC - IP65 Screw Plastic - - - - 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 768-6241
Mfr. Part No.3SE5232-0LC05
BrandSiemens
$31.74
Each
units
Round Plunger Yes NO/2NC Snap - Screw Plastic 1 3 M20 x 1.5 - 3SE5 68mm 31 x 33 x 68 mm
RS Stock No. 258-8215
Mfr. Part No.GSAC20D
BrandHoneywell
$209.83
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. 274-7997
Mfr. Part No.GHG2632301R0007
BrandCEAG
$634.54
Each
units
- - NO/NC - - Screw Polyamide 2 2 M25 DP - 112mm 102 x 84 x 112 mm
RS Stock No. 836-2753
Mfr. Part No.D4N8131
BrandOmron
$35.97
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. 498-965
Mfr. Part No.3SE5232-0CC05
BrandSiemens
$17.54
Each
units
Plunger Yes NO/NC Snap IP65 Screw Plastic 1 2 M20 x 1.5 - 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 498-961
Mfr. Part No.3SE5112-0BA00
BrandSiemens
$43.75
Each
units
- - NO/NC Slow - Screw Metal 1 2 M20 x 1.5 DP 3SE5 37.3mm 85.7 x 40.5 x 37.3 mm
RS Stock No. 749-7707
Mfr. Part No.3SE5413-0CD20-1EA5
BrandSiemens
$82.01
Each
units
Roller Plunger Yes NO/NC - IP67 M12 Metal - - - DPST 3SE5 16.2mm 50 x 30 x 16.2 mm
RS Stock No. 311-0273
Mfr. Part No.GSAC40C
BrandHoneywell
$148.60
Each
units
Plunger Yes 4NC Slow - Screw Metal - 4 M20 x 1.5 4P GSS 42mm 141 x 42 x 42 mm
RS Stock No. 228-071
Mfr. Part No.3SE5242-0BC05
BrandSiemens
$38.87
Each
units
Plunger - NO/NC - IP66, IP67 Screw Plastic - - - - 3SE5 33mm 60.7 x 55.5 x 33 mm
RS Stock No. 228-087
Mfr. Part No.3SE5242-0HC05
BrandSiemens
$37.17
Each
units
Plunger - NO/NC - IP66, IP67 Screw Plastic - - - - 3SE5 33mm 60.7 x 55.5 x 33 mm
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