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. 410-7391
Mfr. Part No.I88-SU1Z RIWK
HK$224.25
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. 749-7666
Mfr. Part No.3SE5232-0HK21
BrandSiemens
HK$241.04
Each
units
Twist Lever Yes NO/NC - IP65 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 698-8779
Mfr. Part No.EX-ZS 335-11Z-3G/D
BrandSchmersal
HK$873.67
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. 621-1521
Mfr. Part No.D4N-112G
BrandOmron
HK$333.86
Each
units
Roller Lever Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 45mm 73 x 31 x 45 mm
RS Stock No. 410-7379
Mfr. Part No.I88-U1Z RIWK
HK$208.67
Each
units
Roller Plunger 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. 410-7408
Mfr. Part No.I88-U1Z-HW
HK$239.78
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. 836-2744
Mfr. Part No.D4N1A32
BrandOmron
HK$206.84
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. 749-7647
Mfr. Part No.3SE5132-0BA00
BrandSiemens
HK$180.87
Each
units
- - NO/NC - IP66, IP67 Screw Plastic - - - DPST 3SE5 37.3mm 85.7 x 40.5 x 37.3 mm
RS Stock No. 749-7631
Mfr. Part No.3SE5122-0CE01
BrandSiemens
HK$389.99
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
HK$303.39
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. 755-7869
Mfr. Part No.3SE5413-0CD20-1EB1
BrandSiemens
HK$434.26
Each
units
Roller Plunger Yes NO/NC Snap - M12 - - 2 - DPST 3SE5 16.2mm 50 x 30 x 16.2 mm
RS Stock No. 749-7653
Mfr. Part No.3SE5232-0BD03
BrandSiemens
HK$214.27
Each
units
Roller Plunger Yes NO/NC - IP65 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 769-6223
Mfr. Part No.3SE5242-0HE10
BrandSiemens
HK$278.22
Each
units
Roller Lever Yes NO/NC Snap - Screw Plastic 2 2 M20 x 1.5 - 3SE5 53mm 50 x 33 x 53 mm
RS Stock No. 755-7871
Mfr. Part No.3SE5413-0CD23-1EA2
BrandSiemens
HK$405.43
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. 179-7563
BrandRS PRO
HK$236.78
Each
units
- - NO/NC Slow IP67 Screw Plastic - - - - - 95mm 31 x 31 x 95 mm
RS Stock No. 749-7656
Mfr. Part No.3SE5232-0BE10
BrandSiemens
HK$243.79
Each
units
Roller Lever Yes NO/NC - IP65 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 258-8259
Mfr. Part No.GSAC21C
BrandHoneywell
HK$1,232.89
Each
units
Plunger Yes NO/NC Snap - Screw Metal - 2 M20 x 1.5 DP GSS 42mm 141 x 42 x 42 mm
RS Stock No. 133-0057
Mfr. Part No.XCSP3702P20
HK$950.00
Each
units
Roller Plunger Yes NO/2NC Slow IP66, IP67 M20 Plastic 1 3 M20 x 1.5 3P XCSP 100mm 34 x 35 x 100 mm
RS Stock No. 411-3021
Mfr. Part No.3SE2243-0XX40
BrandSiemens
HK$338.85
Each
units
- - NO/NC Slow IP65 Screw Fibreglass 3 3 M20 x 1.5 - 3SE5 30mm 90 x 52 x 30 mm
RS Stock No. 768-6424
Mfr. Part No.3SE5242-0HC05-1AJ0
BrandSiemens
HK$309.11
Each
units
Round Plunger Yes NO/NC Snap - Screw Plastic 1 2 M20 x 1.5 - 3SE5 53mm 50 x 33 x 53 mm
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