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. 410-7234
Mfr. Part No.C2-U1Z ST.
TWD568.00
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
RS Stock No. 749-7583
Mfr. Part No.3SE5112-0CD02
BrandSiemens
TWD1,710.00
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. 227-977
Mfr. Part No.3SE5232-0HC05
BrandSiemens
TWD601.00
Each
units
Plunger - NO/NC - IP65 Screw Plastic - - - - 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 746-7264
Mfr. Part No.D4N-4162
BrandOmron
TWD903.00
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. 749-7631
Mfr. Part No.3SE5122-0CE01
BrandSiemens
TWD1,483.00
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. 749-7599
Mfr. Part No.3SE5112-0CH50
BrandSiemens
TWD1,738.00
Each
units
Twist Lever Yes NO/NC - IP66, IP67 Screw Metal - - - DPST 3SE5 37.3mm 85.7 x 40.5 x 37.3 mm
RS Stock No. 768-6503
Mfr. Part No.3SE5122-0PA00
BrandSiemens
TWD989.00
Each
units
Round Plunger - 2NO/NC Slow - Screw Metal 3 3 M20 x 1.5 - 3SE5 78mm 56 x 37.8 x 78 mm
RS Stock No. 410-7032
Mfr. Part No.ENM2-SU1Z IW
TWD1,186.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 749-7616
Mfr. Part No.3SE5122-0BE01
BrandSiemens
TWD1,506.00
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. 258-8091
Mfr. Part No.GSAC01C
BrandHoneywell
TWD2,715.00
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. 228-071
Mfr. Part No.3SE5242-0BC05
BrandSiemens
TWD802.00
Each
units
Plunger - NO/NC - IP66, IP67 Screw Plastic - - - - 3SE5 33mm 60.7 x 55.5 x 33 mm
RS Stock No. 749-7697
Mfr. Part No.3SE5250-0CC05
BrandSiemens
TWD632.00
Each
units
Plunger Yes NO/NC - IP20 Screw Plastic - - - DPST 3SE5 27.8mm 42.5 x 30 x 27.8 mm
RS Stock No. 836-2741
Mfr. Part No.D4N4A31
BrandOmron
TWD1,339.00
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
RS Stock No. 766-1716
Mfr. Part No.XCSM3916L1
TWD2,080.00
Each
units
Rotary Lever Yes NO/2NC Snap - Cable Metal - 3 - 3P XCSM 34mm 94 x 30 x 34 mm
RS Stock No. 228-087
Mfr. Part No.3SE5242-0HC05
BrandSiemens
TWD767.00
Each
units
Plunger - NO/NC - IP66, IP67 Screw Plastic - - - - 3SE5 33mm 60.7 x 55.5 x 33 mm
RS Stock No. 755-7871
Mfr. Part No.3SE5413-0CD23-1EA2
BrandSiemens
TWD1,526.00
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. 768-6462
Mfr. Part No.3SE5112-0PA00
BrandSiemens
TWD989.00
Each
units
Round Plunger - 2NO/NC Slow - Screw Metal 1 3 M20 x 1.5 - 3SE5 78mm 40.5 x 37.3 x 78 mm
RS Stock No. 179-7567
BrandRS PRO
TWD713.00
Each
units
Roller Plunger Yes NO/NC Snap IP67 - Glass Fibre Reinforced Plastic - - - - - 84.5mm 31 x 30.5 x 84.5 mm
RS Stock No. 179-9878
Mfr. Part No.XCSA522
TWD4,252.00
Each
units
- - 2NO/NC - IP67 M20 Metal 1 3 M20 3P XCSA 114mm 40 x 44 x 114 mm
RS Stock No. 768-6474
Mfr. Part No.3SE5112-0CA00
BrandSiemens
TWD933.00
Each
units
Round Plunger - NO/NC Snap - Screw Metal 1 2 M20 x 1.5 - 3SE5 78mm 40.5 x 37.3 x 78 mm