# IEC touch-sensitive sensor: normally closed 3 wire with connector Canonical URL: https://eloragrid.ai/symbols/iec-touch-sensitive-sensor-normally-closed-3-wire-with-connector Publisher: Elora Grid Updated: 2026-10-28 Lookup label: TOUCH Drawing use: Schematic Reference families: IEC, Manufacturer ## Symbol convention Convention: IEC Form: Normally Closed 3 Wire with Connector Autodesk IEC-60617 Symbol Preview: Touch Switches, HPX12TS3C / VPX12TS3C. This identifies the publisher's library context; exact IEC graphics and database identities are not asserted. Touch-sensitive sensor form: Normally Closed 3 Wire with Connector. ## In plain English ### What does IEC touch-sensitive sensor: normally closed 3 wire with connector mean? A touch-sensitive sensor changes its output when its sensing surface is touched under the specified operating conditions. This entry identifies the normally closed 3 wire with connector form in the publisher's IEC-context family. ### A simple example An operator station may use the sensor as a controller input while keeping the powered sensor circuit separate from the load it commands. The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state. The three-wire form distinguishes supply, return and switching output. Confirm sourcing or sinking operation from the actual sensor circuit before connecting it to an input. ### What the drawings help you do The connector variant adds a separable field interface. Keep the mating connector designation, pin numbers and cable-core mapping visible at that boundary. The mark does not establish a safety-rated enabling switch or guaranteed operation with every glove. Sensitivity, environmental suitability and output type need selected-device data. ### This particular reference Touch-sensitive sensor form: Normally Closed 3 Wire with Connector. This entry adds the normally closed 3 wire with connector detail to the broader touch-sensitive sensor family. The mark does not establish a safety-rated enabling switch or guaranteed operation with every glove. Sensitivity, environmental suitability and output type need selected-device data. ### Terms - Normally open / normally closed: The contact state in the normal condition defined for the drawing. - Terminal: An identified point where a conductor connects. - Signal: Electrical information passed between devices, rather than necessarily the main power supply. Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram. - [Autodesk IEC-60617 preview: Touch-switch forms](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-E7D3C5F3-D944-485E-A100-18E2C4E0D0E4.htm) ## What it represents A touch-sensitive sensor changes its output when its sensing surface is touched under the specified operating conditions. This entry identifies the normally closed 3 wire with connector form in the publisher's IEC-context family. An operator station may use the sensor as a controller input while keeping the powered sensor circuit separate from the load it commands. The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state. The three-wire form distinguishes supply, return and switching output. Confirm sourcing or sinking operation from the actual sensor circuit before connecting it to an input. The connector variant adds a separable field interface. Keep the mating connector designation, pin numbers and cable-core mapping visible at that boundary. The mark does not establish a safety-rated enabling switch or guaranteed operation with every glove. Sensitivity, environmental suitability and output type need selected-device data. ## How to read it - The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state. - The three-wire form distinguishes supply, return and switching output. Confirm sourcing or sinking operation from the actual sensor circuit before connecting it to an input. - The connector variant adds a separable field interface. Keep the mating connector designation, pin numbers and cable-core mapping visible at that boundary. - The mark does not establish a safety-rated enabling switch or guaranteed operation with every glove. Sensitivity, environmental suitability and output type need selected-device data. ## Information to show or reference - Identify the target, sensing mode and expected normal condition. - Label supply, output and connector pins from the actual device diagram. - Reference output circuit type, operating range and controller input. ## Important distinction This entry adds the normally closed 3 wire with connector detail to the broader touch-sensitive sensor family. The mark does not establish a safety-rated enabling switch or guaranteed operation with every glove. Sensitivity, environmental suitability and output type need selected-device data. ## Facts - Drawing form: Normally Closed 3 Wire with Connector - Public vendor block names: HPX12TS3C / VPX12TS3C. Autodesk identifiers, not standards database IDs. - Drawing purpose: touch-sensitive sensor - Graphic scope: Independently authored educational illustration; not certified standard geometry, a terminal pinout or a product footprint. ## Public references - [Autodesk IEC-60617 preview: Touch-switch forms](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-E7D3C5F3-D944-485E-A100-18E2C4E0D0E4.htm) — Autodesk. Public Touch Switches table explicitly lists HPX12TS3C / VPX12TS3C with this operating or connection form. Vendor graphics are linked, not copied. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.