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.
TWD544.00
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. 227-977
Mfr. Part No.3SE5232-0HC05
BrandSiemens
TWD631.00
Each
units
Plunger - NO/NC - IP65 Screw Plastic - - - - 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 749-7583
Mfr. Part No.3SE5112-0CD02
BrandSiemens
TWD1,787.00
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. 768-6503
Mfr. Part No.3SE5122-0PA00
BrandSiemens
TWD1,035.00
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. 749-7616
Mfr. Part No.3SE5122-0BE01
BrandSiemens
TWD1,574.00
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. 746-7264
Mfr. Part No.D4N-4162
BrandOmron
TWD864.00
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. 749-7599
Mfr. Part No.3SE5112-0CH50
BrandSiemens
TWD1,820.00
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. 258-8091
Mfr. Part No.GSAC01C
BrandHoneywell
TWD4,040.00
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. 410-7032
Mfr. Part No.ENM2-SU1Z IW
TWD1,186.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 749-7631
Mfr. Part No.3SE5122-0CE01
BrandSiemens
TWD1,533.00
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. 768-6412
Mfr. Part No.3SE5232-0LC05-1AJ0
BrandSiemens
TWD1,023.00
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. 274-7997
Mfr. Part No.GHG2632301R0007
BrandCEAG
TWD20,899.00
Each
units
- - NO/NC - - Screw Polyamide 2 2 M25 DP - 112mm 102 x 84 x 112 mm
RS Stock No. 769-6746
Mfr. Part No.3SE5250-0MC05
BrandSiemens
TWD699.00
Each
units
Plunger Yes NO/2NC Slow - Screw Plastic - 3 - - 3SE5 48.5mm 30 x 20 x 48.5 mm
RS Stock No. 755-7862
Mfr. Part No.3SE5413-0CC22-1EA2
BrandSiemens
TWD1,707.00
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. 768-6443
Mfr. Part No.3SE5212-0PC05
BrandSiemens
TWD888.00
Each
units
Round Plunger Yes 2NO/NC Slow - Screw Metal 1 3 M20 x 1.5 - 3SE5 68mm 31 x 33 x 68 mm
RS Stock No. 768-6415
Mfr. Part No.3SE5232-0CC05-1AJ0
BrandSiemens
TWD967.00
Each
units
Round Plunger Yes NO/NC Snap - Screw Plastic 1 2 M20 x 1.5 - 3SE5 68mm 31 x 33 x 68 mm
RS Stock No. 179-7561
BrandRS PRO
TWD926.00
Each
units
- - 2NC/NO Slow IP67 Screw Plastic - - - - - 95mm 31 x 31 x 95 mm
RS Stock No. 768-6333
Mfr. Part No.3SE5132-0LA00
BrandSiemens
TWD768.00
Each
units
Round Plunger - NO/2NC Snap - Screw Plastic 1 3 M20 x 1.5 - 3SE5 78mm 40.5 x 37.3 x 78 mm
RS Stock No. 768-6257
Mfr. Part No.3SE5234-0BC05-1AC4
BrandSiemens
TWD1,257.00
Each
units
Round Plunger Yes NO/NC Slow - Screw Plastic 1 2 M20 x 1.5 - 3SE5 68mm 31 x 33 x 68 mm
RS Stock No. 258-8192
Mfr. Part No.GSAC20B
BrandHoneywell
TWD4,660.00
Each
units
Plunger Yes 2NO/2NC Snap - Screw Metal - 4 - 4P GSS 42mm 145.8 x 42 x 42 mm