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. 311-0245
Mfr. Part No.GSAC40A1B
BrandHoneywell
$191.65
Each
units
Roller, Rotary Yes 4NC Slow - Screw Metal - 4 M20 x 1.5 4P GSS 55.9mm 145.8 x 42 x 55.9 mm
RS Stock No. 410-7048
Mfr. Part No.ENM2-SU1Z RIW
$58.40
Each
units
- - - - - - - - - - - - - -
RS Stock No. 410-7149
Mfr. Part No.SK-U1Z MRU
$76.13
Each
units
- - - - - - - - - - - - - -
RS Stock No. 410-6922
Mfr. Part No.SKC-A1Z M
$56.96
Each
units
- - - - - - - - - - - - - -
RS Stock No. 861-4648
Mfr. Part No.D4N-2187
BrandOmron
$54.73
Each
units
Rod Yes NO/NC Snap IP67 M20 - - 2 - DPST D4N 170mm 31 x 31.5 x 170 mm
RS Stock No. 749-7616
Mfr. Part No.3SE5122-0BE01
BrandSiemens
$73.02
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. 410-7420
Mfr. Part No.I88-U1Z AH
$45.57
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. 698-8779
Mfr. Part No.EX-ZS 335-11Z-3G/D
BrandSchmersal
$114.64
Each
units
Plunger Yes NO/NC Snap - Screw Metal 1 2 M20 x 1.5 DP EX-ZS 335 38mm 66.5 x 40.5 x 38 mm
RS Stock No. 755-7847
Mfr. Part No.3SE5413-0CC20-1EA5
BrandSiemens
$102.01
Each
units
Round 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. 836-2744
Mfr. Part No.D4N1A32
BrandOmron
$34.37
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. 749-7638
Mfr. Part No.3SE5122-0CH80
BrandSiemens
$89.77
Each
units
Rod Yes NO/NC - IP65, IP67 Screw Metal - - - DPST 3SE5 37.8mm 85.7 x 56 x 37.8 mm
RS Stock No. 836-2747
Mfr. Part No.D4N1A62
BrandOmron
$30.91
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. 258-8221
Mfr. Part No.GSAC21A1B
BrandHoneywell
$131.28
Each
units
Roller, Rotary Yes NO/NC Snap - Screw Metal - 2 M20 x 1.5 DP GSS 55.9mm 145.8 x 42 x 55.9 mm
RS Stock No. 755-7875
Mfr. Part No.3SE5413-0CN20-1EA2
BrandSiemens
$77.49
Each
units
Twist Lever 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. 755-7907
Mfr. Part No.3SE5423-0CD20-1EA2
BrandSiemens
$89.33
Each
units
Roller Plunger Yes NO/NC Snap - Cable - - 2 5 x 0.75 mm² DPST 3SE5 16mm 50 x 40 x 16 mm
RS Stock No. 749-7666
Mfr. Part No.3SE5232-0HK21
BrandSiemens
$43.90
Each
units
Twist Lever Yes NO/NC - IP65 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 768-6412
Mfr. Part No.3SE5232-0LC05-1AJ0
BrandSiemens
$61.53
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. 410-6893
Mfr. Part No.ENM2-SU1Z AHS-V
$66.79
Each
units
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RS Stock No. 749-7580
Mfr. Part No.3SE5112-0CC02
BrandSiemens
$69.30
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. 498-848
Mfr. Part No.3SE5232-1LC05
BrandSiemens
$45.31
Each
units
Plunger Yes 2NC/1NO Snap IP65 Screw Plastic 1 3 M20 x 1.5 - 3SE5 33mm 75.7 x 31 x 33 mm
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