Limit Switches

Limit switches are a contact proximity sensor device that consists of an actuator mechanically linked to a set of output contacts. When an object comes into contact with the actuator, the device operates the contacts to make or break an electrical connection.

Limit Switch Makeup

Limit switches are made up of three key components:
•Actuator Head - The actuator is the part of the switch that makes physical contact with the object. In some limit switches, the actuator is attached to an operating head which translates a rotary, linear, or perpendicular motion to open or close the electrical contacts of the switch.


•Switch Body – The switch body is the component containing the electrical contact mechanism, the contacts within the body open or close the electrical circuit when the actuator is activated.


•Receptacle/Terminals - The component containing the terminal screws or screw/clamp assembly necessary for wiring purposes.



Actuator Types

Limit switches are available with a wide range of actuator types. The type of actuator used can be determined by the mounting position, force required and objects to be detected.
•Rotary Lever - with lever actuators, a cam or plate hits the end of the lever arm which in turn rotates a shaft and operates the contacts in the switch. The rotation may be spring returned (momentary) or maintained.


•Plunger - Plunger types are best where short controlled machine movements are present or where mounting space does not permit a lever type.


•Cat Whisker or Coil Spring – Longer actuators with a coil wire that can be moved/bent in multiple directions. Typically used in conveying applications to count objects as they pass by.


•Forked – Used with maintained contacts, consisting of two roller levers. One roller will trip the switch and when the second is moved to the opposite direction it will reset the switch.

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Description Price Actuator Type Pole and Throw Configuration Normal State Configuration IP Rating Maximum Current Housing Material Maximum AC Voltage Maximum DC Voltage Connection Type Contact Type Series Terminal Type Length Width
RS Stock No. 691-7187
Mfr. Part No.BZ-2R55-A2-S
BrandHoneywell
HK$268.23
Each
units
Plunger SPDT - - 15 A Plastic 250V - - Snap Action BZ Screw 24.13mm 1.94in
RS Stock No. 847-4998
Mfr. Part No.LS-S11-ZB
BrandEaton
HK$900.95
Each
units
Key - NO/NC IP65 3 A @ 24 V dc, 10 A @ 24 V ac - 415V 220V Cable Standard Action - Screw 60mm 173mm
RS Stock No. 144-8403
Mfr. Part No.SZL-VL-S-G-N-M
BrandHoneywell
HK$238.62
Each
units
Steel Wire SPDT NO/NC IP67 0.05 (220 V dc) A, 0.5 (380 V ac) A Glass-Filled Die-Cast Metal 380V 220V M12 Cable Gland Snap Action SZL-VL M12 Connector 28.5mm 160mm
RS Stock No. 691-7213
Mfr. Part No.BZ-2RW825551-A2
BrandHoneywell
HK$191.84
Each
units
Roller Lever SPDT - - 15 A Plastic 125V - - Snap Action BZ Screw 44.7mm 1.94in
RS Stock No. 808-7446
Mfr. Part No.BAF1-2RN-RH
BrandHoneywell
HK$1,100.19
Each
units
Plunger SPDT NO/NC - 20 A Die Cast Aluminium 480V 250V 1/2 in NPT Conduit Snap Action BAF - 101.6mm 54.8mm
RS Stock No. 843-1200
Mfr. Part No.AT4/11-1/I/R316
BrandEaton
HK$855.82
Each
units
Rotary Lever - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT4 Screw - -
RS Stock No. 362-3195
Mfr. Part No.14CE16-1H
BrandHoneywell
HK$828.24
Each
units
Rotary Lever - NO/NC IP65 3 A - 240V 1500V - - 14CE Wire Lead 49mm 40mm
RS Stock No. 240-2650
Mfr. Part No.GLEB07A1B
BrandHoneywell
HK$546.50
Each
units
Rotary Lever SPDT NO/NC IP67 100 mA Die Cast Zinc 50V 50V - Snap Action GLE PG13.5 Connector 106.5mm 65mm
RS Stock No. 700-4327
Mfr. Part No.ZCKJ5H29
HK$291.58
Each
units
- DP NO/NC IP65 10 A Metal 240V 250V - Slow Action OsiSense XC Screw 77mm 40mm
RS Stock No. 447-3604
Mfr. Part No.ZCD21
HK$181.24
Each
units
- DP NO/NC - 1.5 A Metal 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 207-1969
Mfr. Part No.GLBC02A1B
BrandHoneywell
HK$708.80
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action GLB 20 mm Conduit 145.8mm 42mm
RS Stock No. 902-6947
BrandRS PRO
HK$203.65
Each
units
Roller Plunger DPST NO/NC IP67 5 A Thermoplastic 240V 250V Cable Snap - Wire Lead 31.5mm 70mm
RS Stock No. 436-0205
Mfr. Part No.Z-15GW55-B
BrandOmron
HK$112.53
Each
units
Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 28.2mm 49.2mm
RS Stock No. 808-3185
Mfr. Part No.GLDB01A1B3
BrandHoneywell
HK$258.50
Each
units
Roller Lever SPDT 1NO/1NC NO/NC IP66 10 A Plastic, Polyester 300V 300V Internal Screw Terminal Contact Block Snap Action GLD PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 123-4595
Mfr. Part No.XCKW149
HK$1,283.40
Each
units
Adjustable Roller Lever - - IP66, IP67 - Plastic - - - Snap Action OsiSense XC Screw 40mm 58.7mm
RS Stock No. 808-3000
Mfr. Part No.LSM7N
BrandHoneywell
HK$1,104.99
Each
units
Rotary Lever DPDT 2NO/2NC IP65, IP66, IP67 10 A Die Cast Zinc 600V 250V 1/2 in NPT Conduit Snap Action HDLS Screw 47.8mm 45.3mm
RS Stock No. 223-3218
Mfr. Part No.GLAC20B
BrandHoneywell
HK$856.17
Each
units
Plunger DPDT 2NO/2NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action GLA 20 mm Conduit 145.8mm 42mm
RS Stock No. 808-3126
Mfr. Part No.GLAA20A2A
BrandHoneywell
HK$902.99
Each
units
Rotary Lever DPDT 2NO/2NC IP67 10 A Die Cast Zinc 600V 250V 1/2 in NPT Conduit Snap Action GLA Wire Lead 42mm 42mm
RS Stock No. 311-2320
Mfr. Part No.GLEB06B
BrandHoneywell
HK$442.13
Each
units
Plunger SPDT 2NC IP67 10 A Die Cast Zinc 300V 250V - Snap Action GLE PG13.5 Connector 60mm 65mm
RS Stock No. 199-084
Mfr. Part No.AZD1057J
BrandPanasonic
HK$297.00
Each
units
Coil Spring DPST NO/NC IP67 6 A - 380V 220V - - AZD1 Screw 183mm 30mm