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. 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. 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. 749-7616
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. 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. 258-8091
Mfr. Part No.GSAC01C
BrandHoneywell
TWD2,647.00
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. 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. 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. 410-7032
Mfr. Part No.ENM2-SU1Z IW
TWD1,186.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 746-7264
Mfr. Part No.D4N-4162
BrandOmron
TWD886.00
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. 136-3205
Mfr. Part No.6089135057
TWD1,536.00
Each
units
Lever, Plunger, Roller Yes NO/NC Slow IP67 Cable Polymeric 1 2 - SPST I49 92mm 30 x 24 x 92 mm
RS Stock No. 136-3206
Mfr. Part No.6089185056
TWD1,536.00
Each
units
Lever, Plunger, Roller Yes NO/NC Snap IP67 Cable Polymeric 1 2 - SPST I49 92mm 30 x 24 x 92 mm
RS Stock No. 258-8120
Mfr. Part No.GSAC04A1B
BrandHoneywell
TWD3,979.00
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. 757-9140
Mfr. Part No.D4B4111N
BrandOmron
TWD3,190.00
Each
units
Roller Lever Yes NO/NC Snap - Screw Metal 1 2 M20 DPST D4B-N 43mm 99.5 x 40 x 43 mm
RS Stock No. 621-1521
Mfr. Part No.D4N-112G
BrandOmron
TWD1,158.00
Each
units
Roller Lever Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 45mm 73 x 31 x 45 mm
RS Stock No. 766-1615
Mfr. Part No.XCSD3902P20
TWD1,467.00
Each
units
Roller Plunger Yes NO/2NC Snap - Cable Metal 1 3 M20 x 1.5 3P XCSD 35mm 100 x 34 x 35 mm
RS Stock No. 766-1712
Mfr. Part No.XCSM3915L1
TWD2,143.00
Each
units
Rotary Lever Yes NO/2NC Snap - Cable Metal - 3 - 3P XCSM 34mm 94 x 30 x 34 mm
RS Stock No. 136-3211
Mfr. Part No.6097185085
TWD10,017.00
Each
units
Lever, Roller Yes NO/NC - IP66, IP67 Cable Gland Die Cast Aluminium 1 2 M20 x 1.5 SPST ENM2-EX 134.5mm 40 x 61 x 134.5 mm
RS Stock No. 258-8170
Mfr. Part No.GSAC20A1B
BrandHoneywell
TWD4,919.00
Each
units
Rotary Yes 2NO/2NC Snap - Screw Metal - 4 M20 x 1.5 4P GSS 55.9mm 145.8 x 42 x 55.9 mm
RS Stock No. 136-3191
Mfr. Part No.6086803013
TWD1,153.00
Each
units
Plunger Yes 2NC - IP65 Screw Thermoplastic 1 2 M20 x 1.5 DPST I88 74mm 31 x 30.5 x 74 mm