Buy Limit Switches and Industrial Sensors Online — Worldwide Delivery

Electrihub is a global distributor of industrial sensing and detection equipment, supplying limit switches, safety interlock switches, proximity sensors, photoelectric sensors, capacitive sensors, pressure sensors, and ultrasonic sensors to customers across the United States, European Union, United Kingdom, Middle East, Asia-Pacific, and beyond. Whether you are an OEM engineer specifying sensors for a new machine build, a procurement manager sourcing replacement parts for a production facility, or an electrical panel builder looking for reliable detection components for a control system, Electrihub stocks the brands and series you need — ready to ship internationally.

A limit switch is an electromechanical device that converts the physical position or movement of a machine component into an electrical switching signal — stopping a motor, feeding a PLC input, or triggering a safety relay. At the heart of every automated conveyor, robotic cell, hydraulic press, packaging machine, and crane system sits a network of limit switches and sensors that confirm position, count cycles, verify presence, and protect people from hazardous machine motion. Getting the right device specified correctly is critical — an incorrect IP rating, wrong actuator type, or insufficient safety certification can cause machine downtime, failed audits, or serious safety incidents.

Electrihub sources exclusively from the world's leading sensor manufacturers — Telemecanique Sensors (Schneider Electric), ABB, and Schneider Electric — all supplied through authorised distribution channels with full manufacturer traceability, original packaging, and valid CE, UL, and international certifications. Every product shipped from Electrihub is genuine — not grey-market or counterfeit stock.

Limit Switch and Industrial Sensor Types — Full Range

Mechanical Limit Switches

Mechanical limit switches remain the most rugged and versatile position detection device in industrial automation. A physical actuator — roller lever, plunger, rod lever, or rotary head — is depressed or rotated by a moving machine part to snap or gradually open and close a set of electrical contacts (NO, NC, or 1NO+1NC). Rated for direct switching at up to 10 A / 240 V AC, with mechanical endurance of up to 30 million operating cycles, and available in IP65 to IP67 sealed housings for dusty, wet, and wash-down environments. Mechanical limit switches conform to IEC 60947-5-1 and are approved to UL 508 for North American panel builders. They remain the preferred choice wherever direct current switching is required without an intermediate relay, and wherever the robustness of a fully mechanical device is valued over the convenience of a solid-state sensor.

Safety Interlock Switches

Safety interlock switches — also known as guard interlock switches or safety limit switches — are designed and certified specifically for machine guarding safety circuits. They incorporate positive opening contacts per IEC 60947-5-1 Annex K, ensuring the NC contact is mechanically forced open even if it has welded shut due to a fault condition. Certified to ISO 14119 (the international standard for interlocking devices associated with guards) and capable of achieving SIL 2 / SIL 3 and PL d / PL e performance levels under IEC 62061 and ISO 13849 — the standards required for CE-marked machinery sold in the EU and UK, and increasingly referenced in US and Middle Eastern machine safety regulations. Available in key-operated, solenoid-locking, and contactless RFID coded variants.

Inductive Proximity Sensors

Inductive proximity sensors are the most widely used non-contact detection technology in global industrial automation. They detect ferrous and non-ferrous metal objects without physical contact using an oscillating electromagnetic field at the sensor face, with no wear, no moving parts, and operating frequencies up to several kHz. Available in M8, M12, M18, and M30 cylindrical formats and rectangular housings, in flush (shielded) and non-flush (unshielded) variants, with PNP sourcing or NPN sinking transistor outputs (3-wire DC) or 2-wire AC/DC outputs. Sensing distances from 1.5 mm (M8) to 40 mm (M30 non-flush). Rated IP67 as standard, with IP68 and IP69K variants for food processing, pharmaceutical, and offshore environments. Conform to IEC 60947-5-2.

Capacitive Sensors

Capacitive proximity sensors detect the presence of virtually any material — metal, liquid, granules, powder, glass, plastic, or wood — by sensing a change in capacitance as the target enters the sensor's electrostatic field. Unlike inductive sensors, they are not limited to metal targets, making them the correct choice for level detection through container walls, fill-level monitoring on bottling and packaging lines, label and insert detection, and non-metallic component presence sensing on assembly machines. Available in M18 and M30 cylindrical formats with an adjustable sensitivity potentiometer for fine-tuning the detection threshold. Standard IP67 protection.

Photoelectric Sensors

Photoelectric sensors detect objects at distances from millimetres to 60 metres using a modulated infrared, red LED, or laser light beam, in three standard operating modes. Through-beam (separate emitter and receiver, up to 60 m) provides the longest range and highest immunity to ambient light — the preferred mode for conveyor counting and high-speed detection applications. Retroreflective (emitter and receiver in one housing, beam reflected from a corner-cube reflector, up to 15 m) simplifies wiring to a single housing while maintaining long range. Diffuse (emitter and receiver in one housing, beam reflects off the target itself, up to 3 m) is used where fitting a separate reflector is not practical. Photoelectric sensors are specified across packaging, material handling, automotive, food and beverage, and logistics automation globally.

Pressure Sensors and Pressure Switches

Electronic pressure sensors provide a continuous analogue output (4–20 mA or 0–10 V) proportional to the measured pressure of a gas or liquid — feeding a PLC analogue input or process controller for closed-loop pressure regulation, monitoring, and alarm generation. Pressure switches provide a discrete ON/OFF output when pressure crosses a set threshold — used for pump dry-run protection, filter differential pressure alarms, pneumatic circuit supply monitoring, and hydraulic system interlocking. Available with stainless steel wetted parts for aggressive media, hygienic process connections for food applications, and pressure ranges from full vacuum to 600 bar for hydraulic and high-pressure industrial systems.

Ultrasonic Sensors

Ultrasonic sensors emit a high-frequency sound pulse and measure the time for the echo to return, calculating distance to the target regardless of its colour, surface texture, or transparency — making them the only reliable option for detecting clear glass bottles, transparent film, or highly reflective polished metal surfaces where photoelectric sensors fail. Sensing ranges from 20 mm to 6 m, with analogue (4–20 mA / 0–10 V) or discrete switching outputs. Widely specified for tank and silo level measurement, distance feedback on AGVs and robotic systems, web and loop control, and detection of transparent packaging in FMCG production lines.

RFID Coded Antenna Sensors

RFID coded safety switches detect only their own uniquely coded actuator key — not any nearby metal, magnet, or generic object — providing a level of tamper resistance that conventional inductive or magnetic switches cannot match. This makes them the required choice wherever a risk assessment identifies a deliberate bypass risk, or wherever the application demands PL e / SIL 3 performance from a single switch in a Category 4 safety architecture. No physical contact between switch and actuator is required, eliminating mechanical wear on the safety device entirely.

Brands, Series, and Key Specifications

The table below covers all limit switch and sensor product lines stocked at Electrihub for global supply. All products carry valid international certifications (CE, UL, and applicable regional approvals) and are supplied in original manufacturer packaging.

All limit switches conform to IEC 60947-5-1. All electronic sensors conform to IEC 60947-5-2. Safety interlock switches comply with ISO 14119 and IEC 62061. CE and UKCA marking applies across the range. UL 508 listed products available for North American panel builders. Refer to individual product datasheets for full electrical ratings, SIL / PL values, and regional approval details.

Who We Supply

OEM Machine Builders and System Integrators — Electrihub supplies OEM engineers and system integrators across the US, EU, UK, GCC, and Asia-Pacific who are designing new automated machinery and need a reliable source for sensing components at competitive prices with consistent global availability. Our product range covers the exact brands and series specified in most international machine design standards — so your bill of materials is always fully supported from a single distributor.

Procurement and Maintenance Teams — For MRO (maintenance, repair, and operations) procurement teams managing spare-part inventories for production facilities, Electrihub offers genuine OEM products with full part-number traceability, fast international dispatch, and a consistent supply chain free from counterfeit risk. Our stock covers the most widely installed limit switch and sensor series worldwide — making us a reliable source for like-for-like replacements without design changes.

Electrical Panel Builders — Panel builders require limit switches and control circuit components that are UL 508 listed for North American panels, CE marked for European installations, and UKCA marked for UK supply. Electrihub stocks limit switches and sensors carrying the relevant international certifications for each market — with the documentation to support your panel certification process. ABB LS series and Telemecanique OsiSense XC series are both UL 508 listed and IEC 60947-5-1 compliant, covering the full range of panel builder requirements globally.

How to Specify the Right Limit Switch or Sensor

Step 1 — Choose the detection technology: Use a mechanical limit switch for direct high-current switching with physical actuation — no intermediate relay required. Use an inductive proximity sensor for non-contact metal detection with no wear and high cycle rates. Use a capacitive sensor for non-metallic, liquid, or powder targets. Use a photoelectric sensor for long-range or non-contact detection. Use a pressure sensor for process pressure monitoring. Use an ultrasonic sensor for level measurement or transparent/reflective target detection. Always use a certified safety interlock switch when the function forms part of a machine guarding safety circuit under IEC 62061 or ISO 13849.

Step 2 — Select the actuator type (mechanical limit switches): Roller lever — general-purpose cam-actuated travel limit, the most common global choice. Plunger / roller plunger — inline push applications on linear mechanisms. Adjustable roller lever — the actuation point is set without physically repositioning the switch, saving commissioning time. Cat's whisker or spring wire — multi-directional actuation from a very light actuating force. Rod lever (galvanised or stainless steel) — crane and hoist end-of-travel applications with high actuating force and impact resistance.

Step 3 — Contact configuration (NO / NC): Use NO (Normally Open) contacts for position-reached or run-enable signals. Use NC (Normally Closed) for stop signals, interlocks, and safety loops — an open circuit due to wire break or device failure gives a safe de-energised state. Specify 1NO+1NC as the general-purpose standard covering both functions. For any safety application, NC contacts with certified positive opening operation are mandatory — this eliminates the risk of a welded contact failing to open the safety circuit.

Step 4 — Output type (electronic sensors): PNP (sourcing, 3-wire) — output goes to +24 V when active. The correct choice for the vast majority of Siemens, Schneider, Rockwell, Mitsubishi, Omron, Beckhoff, and B&R PLC input cards used in modern global machine builds. NPN (sinking, 3-wire) — output goes to 0 V when active; required only for specific older-style PLC input cards or certain Japanese PLC models. 2-wire AC/DC — wired in series with the load like a switch; simplest wiring but a small residual leakage current in the off state to consider. Analogue 4–20 mA or 0–10 V — continuous proportional output for level measurement and closed-loop pressure control.

Step 5 — IP rating and environment: IP65 — total dust protection and water jets; general indoor industrial use. IP66/IP67 — powerful water jets or temporary immersion; outdoor, wash-down, and heavy contamination environments. IP68 — permanent submersion; underground or subsea applications. IP69K (DIN 40050) — high-pressure, high-temperature steam cleaning; required for food processing, beverage, dairy, and pharmaceutical plant environments. Confirm the operating temperature range for high-ambient applications: standard products are rated −25 °C to +70 °C.

Key Technical Terms for Global Buyers

Positive Opening Operation — The NC contact is mechanically forced open by the actuating mechanism, not by spring return alone. Even if the contact welds shut due to a fault, the mechanism still physically breaks the circuit. This is a mandatory requirement for safety circuit contacts per IEC 60947-5-1 Annex K and is the distinguishing technical feature that separates certified safety interlock switches from standard limit switches. Always confirm this feature in the datasheet before specifying a switch in a SIL or PL-rated safety function.

CE and UKCA Marking — CE marking indicates that a product conforms to all applicable EU Directives (Low Voltage Directive, Machinery Directive, EMC Directive) and is required for products placed on the market in the European Union and EEA. UKCA (UK Conformity Assessed) marking is required for products placed on the market in Great Britain (England, Scotland, Wales) post-Brexit. All limit switches and sensors supplied by Electrihub carry CE marking; UKCA marked variants are available for UK supply. Both markings are based on the same underlying IEC standards.

UL 508 Listing — UL 508 is the North American standard for industrial control equipment. Limit switches and sensors with UL 508 listing can be installed in UL-listed control panels in the United States and Canada without derating or additional justification. OEM machine builders and panel builders exporting equipment to North America should confirm UL 508 listing on every sensing device in their panel. ABB LS series and Telemecanique OsiSense XC series both carry UL 508 listing.

Nominal Sensing Distance (Sn) and Correction Factors — Sn is the theoretical inductive sensor detection distance measured with a standardised mild steel (Fe 360) target of defined dimensions per IEC 60947-5-2. The reliable operating distance in service is 0 to 0.81× Sn. For non-ferrous metals, Sn is reduced by a material correction factor — typically 0.35–0.7× for aluminium, 0.3–0.5× for brass, and 0.25–0.45× for copper. Always consult the datasheet correction table when detecting non-ferrous targets.

PNP vs NPN Output — Global Wiring Conventions — PNP (sourcing) sensors output +24 V when active and connect to PLC input cards with a common 0 V (negative) return — the global standard for modern European and Asian PLC platforms. NPN (sinking) sensors output 0 V when active and connect to PLC cards with a common +24 V — historically common in some Japanese PLC architectures. For Siemens, Schneider M340/M580, Rockwell CompactLogix/ControlLogix, Beckhoff, B&R, Mitsubishi iQ-R, and Omron NX/NJ series PLCs, specify PNP output as the default.

Performance Level (PL) and SIL — International Safety Standards — Performance Level (PL a–e) per ISO 13849 and Safety Integrity Level (SIL 1–3) per IEC 62061 quantify the reliability of a safety function. These are the two parallel international frameworks for machinery safety — ISO 13849 is more widely used for mechanical machine safety; IEC 62061 is preferred in complex electrical/electronic systems. For standard guard interlocking, PL d (Category 3) or SIL 2 is the typical minimum. A single XCSR RFID coded switch can achieve PL e / SIL 3 in a Category 4 architecture. CE-marked machinery sold in the EU and UK is required to demonstrate compliance with one or both standards under the Machinery Directive / Machinery Regulation.

Frequently Asked Questions

Does Electrihub ship limit switches and sensors internationally?
Yes. Electrihub ships to customers across the United States, European Union, United Kingdom, UAE, Saudi Arabia, Qatar, Australia, Singapore, and other global markets. All products are supplied in original manufacturer packaging with full documentation including CE declarations, UL listings, and datasheets. Contact us for shipping options, lead times, and any import documentation requirements specific to your country.

Are your limit switches CE marked and UL listed?
Yes. Telemecanique OsiSense XC and ABB LS series limit switches are CE marked under the EU Low Voltage Directive and listed to UL 508 for North American industrial control panel use. Safety interlock switches additionally carry CE marking under the Machinery Directive with ISO 14119 compliance. UKCA marked variants are available for UK supply. Always request the specific conformity declaration for your product if required for a CE technical file or UL panel inspection.

What is the difference between XCKM, XCKL, and XCKJ?
All three are Telemecanique OsiSense classic metal-body limit switches under IEC 60947-5-1. XCKM has 3 cable entries (IP65, general purpose). XCKL has 1 cable entry (IP65, space-constrained installations). XCKJ conforms to the EN 50041 industrial format standard — a specific body dimension used in European heavy industrial, hoisting, and material handling machinery — and is rated IP66. For crane and hoist travel limit applications anywhere in the world, specify XCKJ. For general machine control, XCKM or XCKL is the standard choice.

When is a safety interlock switch required instead of a standard limit switch?
A safety interlock switch is required whenever the switch monitors a machine guard, access door, or perimeter gate that protects people from hazardous machine motion — and the safety function has been assigned a PL or SIL requirement through a risk assessment. Standard limit switches do not have certified positive opening contacts and cannot be included in SIL/PL-rated safety circuits. For CE-marked machinery sold in the EU or UK, or machinery complying with OSHA or ANSI standards in the US, safety interlock switches certified to ISO 14119 are required for all guard monitoring safety functions.

Which sensor output — PNP or NPN — should I specify for my PLC?
For Siemens S7 / ET200, Schneider M340 / M580 / Modicon, Rockwell CompactLogix / ControlLogix, Beckhoff EtherCAT I/O, B&R X20, Mitsubishi iQ-R, and Omron NX/NJ series — specify PNP (sourcing) output. The sensor output goes to +24 V when active and wires to a common 0 V PLC input card. NPN (sinking) is only required for specific older Japanese PLC architectures or legacy systems with a common positive supply. When in doubt, specify PNP — it is the correct choice for virtually all modern global PLC platforms.

How do I select the right IP rating for my application?
Match the IP rating to the worst-case environmental condition at the installation point. IP65 is sufficient for general indoor manufacturing. IP66 or IP67 is required for outdoor installations, wash-down areas, and environments with high-pressure water exposure. IP68 is required for permanent immersion. IP69K is mandatory for food and beverage, dairy, pharmaceutical, and other applications involving regular high-pressure steam or hot-water cleaning. Selecting an insufficient IP rating is one of the most common causes of premature sensor failure in industrial environments globally.

Brands we have in Limit Switch

ABB Limit Switch, Telemecanique Limit Switch, Schneider Limit Switch

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