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Limit switches are essential components in automated systems, acting as safety devices or signaling mechanisms. Selecting the correct limit switch ensures reliable operation, prevents damage to equipment, and maintains workplace safety. Understanding key features will help you make an informed purchase for your specific application.
KW12-3 Roller Lever Arm Micro Limit Switch, Normally Open and Close Diamension: 20 x 10.5 x 6.5mm (L x W x H)
Contact spacing is small,short stroke action,according to the power of small,fast-break.
Rated voltage: AC 125V-250V; Current rating: 5A
Application:Apply in A computer mouse, car mouse, automobile electronic products, communications equipment, military products, test instrument, gas water heater, gas burner, small home appliance, microwave oven, electric rice cooker, floating ball...
Highly Adjustable Actuation: Features an extendable rotary lever arm with a ±90° operating angle. The adjustable length allows you to easily customize the actuation point, while the smooth steel roller ensures low friction and high precision
Momentary Snap Action: Engineered for reliability, the momentary mechanism ensures immediate contact reset, perfect for position monitoring and safety interlocking
Reliable 1NO + 1NC Circuit: Features a 4-terminal, 1NO + 1NC double-break configuration with silver contacts for versatile wiring. Electrical ratings: Ui: 380V, Ith: 10A; AC-15 (Ue: 250V, Ie: 1.5A)
Heavy-Duty IP66 Housing: Robust die-cast aluminum alloy enclosure with IP66 waterproof rating. Provides superior protection against heavy dust, oil, and high-pressure water in harsh environments
Universal Integration: Standard mounting footprint with a secure, sealed cable gland. Ideal replacement switch for CNC machines, packaging equipment, and industrial automation
-Package Includes:30 Pcs× AC 2A 125V 3Pin SPDT Limit Micro Switch Long Hinge Lever
-Size of the Swich: 12.6× 6.5× 5.7mm/ 0.49× 0.26× 0.22in ,Size of Lever Arm: 13.5 x 4mm/ 0.53× 0.16in (L*W)
-Product Name: Micro Switch;Contact Type: SPDT;Voltage and Current: AC 125V 2A;Quantity of Pins: 3 Pins Action Type: Momentary Material: Plastic and metal Color: Black and white
-Excellent touch switches,Pin-type package with plastic to prevent infiltration of welding pine fragrance.long service life. Life expectancy:More than 500000（Life expectancy at switch testing machine for a continuous period of work,operating at...
Material: plastic and metal,Every switch has passed the qualified test. If you have any quality problems, please contact us and we will provide you with satisfactory after-sales service.
Actuator Type: Long Hinge Lever; Switch Type:Momentary; Contact Type: SPDT 1NO 1NC
Compact size, high sensitivity and short operating stroke, small pressing force, quick connect or disconnect. Durable and reliable material construction, long service life.
The mini tact switches are widely used in automobile electronic products, communication equipment, test instrument, small home appliance such as audio, toys, microwave oven, electric rice cooker, and other automatic equipment.
【PERFECT OEM REPLACEMENT】Direct replacement for TZ-6106 and TZ-6 style limit switches. Specifically designed for controlling air curtains, push/pull motors, and industrial roll-up doors. Compatible with most major air curtain brands and automated...
【HIGH-PERFORMANCE 15A SWITCHING】Equipped with a robust internal micro switch capable of handling high inrush currents up to 15A at 250VAC. Ideal for heavy-duty motors and fans, ensuring reliable electrical life and minimizing arcing during frequent...
【SENSITIVE MULTI-DIRECTIONAL ACTUATOR】Features a highly flexible stainless steel coil spring rod that can be actuated from any direction . This design provides maximum installation flexibility and ensures sensitive triggering even in complex...
【IP65 WATERPROOF & DUSTPROOF】Engineered with a sealed housing and a protective rubber boot to achieve an IP65 rating. This ensures stable performance in harsh industrial environments, protecting the internal components from water jets, oil, and dust
【HEAVY-DUTY INDUSTRIAL BUILD】CE certified for safety. Each unit comes complete with an M20x1.5 cable gland, metal washers, and nuts for a secure, airtight installation. Built for long-term durability in high-vibration and demanding factory conditions
Last update on 2026-07-18 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Limit Switches
Types of Limit Switches
Limit switches come in various forms, each suited for different environments and operational needs. Roller lever types are common for detecting the position of moving parts. Plunger types offer direct linear actuation, ideal for precise end-of-travel detection. Cat whisker or rod lever types provide flexibility in actuation direction. Waterproof or heavy-duty models are available for harsh industrial settings.
Key Specifications to Consider
When choosing a limit switch, several specifications are crucial. Actuator type dictates how the switch is triggered. Contact configuration (e.g., SPDT, DPDT) determines the number of circuits and how they are switched. Electrical rating (voltage and amperage) must match the load it will control. Environmental sealing (IP rating) is vital for protection against dust and water. Finally, consider the mounting style and mechanical life expectancy for long-term reliability.
Installation and Safety
Proper installation is paramount for the safe and effective operation of any limit switch. Always ensure the switch is securely mounted and aligned correctly with the actuating mechanism. Electrical connections should be made by a qualified electrician, adhering to all local codes and safety standards. Verify that the switch's intended function (e.g., normally open, normally closed) aligns with the safety requirements of the machinery it controls.
Applications
Limit switches find widespread use across numerous industries. They are commonly employed in manufacturing for controlling conveyor belts, machine tools, and robotic arms. In building automation, they can be used in elevators or automated doors. They also serve critical safety functions in industrial machinery to prevent over-travel or collisions.
Frequently Asked Questions
What is the main function of a limit switch?
A limit switch is an electromechanical device that detects the presence or absence of an object or the position of a moving part. It acts as a control switch that operates when a predetermined limit is reached, often used for safety or to signal the end of a travel path.
What is the difference between a normally open (NO) and normally closed (NC) contact?
Normally open contacts are open (not conducting) when the switch is not actuated and close (conduct) when the switch is triggered. Conversely, normally closed contacts are closed (conducting) when the switch is not actuated and open (stop conducting) when triggered.
How do I choose the right actuator type?
The actuator type should be chosen based on how the switch will be triggered. Roller levers are good for detecting movement along a track, while plunger types are best for direct, linear stops. Rod levers offer more flexibility in the direction of actuation.
What does an IP rating mean for a limit switch?
The IP (Ingress Protection) rating indicates the degree of protection provided by the switch's enclosure against solid objects (like dust) and liquids (like water). Higher IP ratings, such as IP65 or IP67, signify better protection for use in harsh or wet environments.
Can limit switches be used outdoors?
Yes, many limit switches are designed for outdoor or harsh industrial use. Look for models with high IP ratings for dust and water resistance, as well as robust construction to withstand temperature fluctuations and environmental exposure.
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