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. 746-7270
Mfr. Part No.D4N-4187
BrandOmron
$78.20
Each
units
Plastic Rod Yes NO/NC Snap - Screw - - 2 - DPST D4N 31.5mm 64 x 31 x 31.5 mm
RS Stock No. 410-7379
Mfr. Part No.I88-U1Z RIWK
$45.60
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. 749-7616
Mfr. Part No.3SE5122-0BE01
BrandSiemens
$81.05
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. 749-7580
Mfr. Part No.3SE5112-0CC02
BrandSiemens
$81.84
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. 768-6434
Mfr. Part No.3SE5212-0MC05
BrandSiemens
$45.38
Each
units
Round Plunger Yes NO/2NC Slow - Screw Metal 1 3 M20 x 1.5 - 3SE5 68mm 31 x 33 x 68 mm
RS Stock No. 746-7242
Mfr. Part No.D4N-4120
BrandOmron
$69.90
Each
units
Roller Lever Yes NO/NC Snap - Screw - - 2 M20 DPST D4N 47mm 64 x 31 x 47 mm
RS Stock No. 410-7234
Mfr. Part No.C2-U1Z ST.
$28.26
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. 746-7261
Mfr. Part No.D4N-4180
BrandOmron
$94.01
Each
units
Cat's Whisker Yes NO/NC Snap - Screw - - 2 - DPST D4N 31.5mm 64 x 31 x 31.5 mm
RS Stock No. 768-6507
Mfr. Part No.3SE5122-0CA00
BrandSiemens
$58.49
Each
units
Round Plunger - NO/NC Snap - Screw Metal 3 2 M20 x 1.5 - 3SE5 78mm 56 x 37.8 x 78 mm
RS Stock No. 258-8192
Mfr. Part No.GSAC20B
BrandHoneywell
$238.29
Each
units
Plunger Yes 2NO/2NC Snap - Screw Metal - 4 - 4P GSS 42mm 145.8 x 42 x 42 mm
RS Stock No. 411-3021
Mfr. Part No.3SE2243-0XX40
BrandSiemens
$68.99
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. 410-7391
Mfr. Part No.I88-SU1Z RIWK
$44.83
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. 621-1521
Mfr. Part No.D4N-112G
BrandOmron
$89.32
Each
units
Roller Lever Yes NO/NC Snap IP67 Screw - - 2 - SPDT D4N 45mm 73 x 31 x 45 mm
RS Stock No. 447-4635
Mfr. Part No.XCSM3910L2
$114.95
Each
units
Plunger Head Yes NO/2NC Snap IP66, IP67, IP68 Screw Metal - 3 - - XCSM 16mm 60 x 30 x 16 mm
RS Stock No. 746-7264
Mfr. Part No.D4N-4162
BrandOmron
$63.46
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. 498-955
Mfr. Part No.3SE5232-0FC05
BrandSiemens
$38.13
Each
units
Plunger Yes NO/NC Snap IP65 Screw Plastic 1 2 M20 x 1.5 - 3SE5 33mm 75.7 x 31 x 33 mm
RS Stock No. 746-7273
Mfr. Part No.D4N-4A2G
BrandOmron
$105.16
Each
units
Roller Lever Yes NO/NC Slow - Screw - - 2 M20 DPST D4N 45mm 64 x 31 x 45 mm
RS Stock No. 258-8120
Mfr. Part No.GSAC04A1B
BrandHoneywell
$203.27
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. 258-8164
Mfr. Part No.GSAC04D
BrandHoneywell
$215.18
Each
units
Roller Arm Yes NO/NC Slow - Screw Metal - 2 M20 x 1.5 DP GSS 42mm 141 x 42 x 42 mm
RS Stock No. 749-7650
Mfr. Part No.3SE5232-0HD03
BrandSiemens
$41.06
Each
units
Roller Plunger Yes NO/NC - IP65 Screw Plastic - - - DPST 3SE5 33mm 75.7 x 31 x 33 mm
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