Limit Switch | 250V 5A SPDT | 1NO 1NC Roller Lever Arm (10-Pack)

This KW12-3 micro limit switch is a mechanical switch. Physical contact triggers it. The roller lever arm allows for smooth activation. It's often used to detect the end of travel in moving systems. This is a pack of 10 switches. Features and Benefits - Roller Lever Arm - The small wheel on the lever reduces friction and wear. Sliding parts can activate it without getting caught. - SPDT Contacts (1NO/1NC) - It has both normally open and normally closed contacts. This lets you wire it for different logic needs in your circuit. - 5A 250V AC Rating - It can handle enough current. You can directly switch small AC motors, solenoids, and lights without another relay. - Snap-Action Mechanism - The switch gives a quick, clear click. This prevents arcing and ensures a dependable trigger point every time. Applications - 3D Printers and CNCs - People commonly use it as an endstop switch. It tells the machine's controller when an axis has reached its furthest point. - Automation Equipment - It can detect an object on a conveyor line. It also confirms the position of a robot arm. - Safety Interlocks - You can use it in enclosures or on machine guards. It cuts power if a door or panel opens during operation. Step 1: Address the Root Cause First Before attempting to reset a limit switch, it is crucial to identify why it tripped. A limit switch, such as this SPDT (Single Pole Double Throw) 250V 5A Roller Lever Arm model, acts as a safety device. It prevents machinery from exceeding its safe operating limits or detects a specific position. Common causes for tripping include overheating (e.g., in a furnace, where temperatures might exceed 100°F or 115°F), an obstruction, or a mechanical misalignment. Addressing the underlying problem is essential to prevent immediate re-tripping and potential damage. Step 2: How to Reset the Switch Method A: Automatic / Soft Reset (Most Common) Many limit switches, including this micro limit switch with a Roller Lever Arm, are designed to reset automatically once the condition that caused them to trip has been resolved. For instance, if a furnace limit switch tripped due to overheating, it should reset itself when the temperature drops to a safe level. This type of reset does not require direct user intervention on the switch itself. Ensure the power to the circuit is stable and that any obstructions or excessive temperatures have cleared. The switch will return to its 1 Normally Open (NO) or 1 Normally Closed (NC) state automatically. Method B: Manual Reset Switch While this specific KW12-3 model with a Roller Lever Arm is typically an automatic reset type, some limit switches feature a manual reset button. If your system incorporates a manual reset limit switch, locate the small, often red or black, button on the switch body. Press and hold it for a few seconds to reset the internal mechanism. Always ensure that the power to the equipment is off before attempting a manual reset to prevent accidental activation or electric shock. This method forces the switch back to its original 1NO 1NC contact configuration. When to Call a Professional If a limit switch repeatedly trips, or if it fails to reset after addressing the apparent cause, it indicates a more significant underlying issue. For example, if a furnace limit switch consistently trips even after the furnace has cooled, there could be a fault with the furnace itself, a faulty controller, or the limit switch might be defective. Attempting to bypass or force a faulty limit switch can be dangerous. A qualified professional can diagnose and safely rectify issues with the equipment or replace a faulty 250V 5A SPDT limit switch.