Waterproof and dustproofdesign (IP67)
Compact size andcompact structure
Long lifespan andhigh reliability
100% Manufactory
Set up since 2012, our company own the factory, and experienced.
PROFESSIONAL MANUFACTURER OF MICRO SWITCHES
Waterproof and dustproofdesign (IP67)
Compact size andcompact structure
Long lifespan andhigh reliability
Product Quality
Uiled have obtained relevant CCC, CQC, UL, VDE, CE, ENEC enterprise and relevant product certifications.
Sales Market
We have gained a global sales network reaching many countries over North America, South America, Europe, Africa and South East Asia.
After-Sales Service
A complete service network has been established to respond to user requests within 24 hours.
PRODUCTS
The core products include micro switches and travel limit Switch, push button switch, foot switch, toggle switch, AC power socket.
The core products include micro switches and travel limit Switch, push button switch, foot switch, toggle switch, AC power socket.
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ABOUT LEMA
Lema is committed to R&D, production and sales of industrial control electrical switches. The company's core products include micro switches and travel limit Switches, push button switches, foot switches, toggle switches, AC power socket.
After nearly 30 years of steady development, Lema has become a large-scale professional manufacturer of micro switches in China. The company currently covers an area of more than 11,000 square meters.
2000Years
Established in
40+
Exporting countries and regions
10000m2
Factory floor area
60+
Authentication certificate
APPLICATION
Committed to research and development, production, sales of industrial electrical switches and connectors
INDUSTRIAL
AUTOMATION
Industrial automation empowers smart manufacturing with reduced manual labor, higher precision, and greater efficiency.
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Center-Off Toggle Switch: ON-OFF-ON Circuit Uses
A center-off toggle switch has three stable lever positions—ON, OFF and ON—so the middle position disconnects the controlled path while either outer position selects a different circuit state. It is commonly used for forward/stop/reverse requests, raise/stop/lower controls, source selection and manual mode commands. The label describes lever behavior, not the internal terminal map. Pole count, maintained or momentary action, contact sequence, voltage, load and interlocking must all be verified before wiring. This guide explains how to specify an ON-OFF-ON switch without confusing it with ON-ON-ON or momentary variants. LEMA LT3130A images are real product references. Always use the exact model drawing and continuity table for the selected ordering code. Center-off patterns compared MarkingCenter stateOuter positionsTypical use ON-OFF-ONMaintained open/neutral stateTwo maintained selectionsDirection or source selection with a stop position (ON)-OFF-(ON)Maintained centerMomentary both sidesRaise/lower or jog commands (ON)-OFF-ONMaintained centerOne momentary, one maintainedMixed command functions after risk review ON-ON-ONConnected center patternTwo additional connected patternsMulti-circuit selection; not center-off ON-OFFNo third positionOne connected, one disconnectedSimple two-position control Parentheses conventionally indicate spring-return positions, but markings vary. Confirm the mechanical action and circuit diagram instead of ordering from punctuation alone. What happens in the center position In a true center-off function, the relevant moving contact is not connected to either outer throw in the center position. In a single-pole version, a common terminal usually selects one of two throws. In a double-pole version, two independent commons change together. The center may disconnect both poles, but terminal numbering and physical layout differ between families. Center-off does not guarantee galvanic isolation for every circuit or a safety-rated stop. Contact spacing, leakage through other components, shared commons and downstream electronics still matter. If isolation or hazardous-motion stopping is required, use...
↗Limit Switch Mounting Position and Repeatability Guide
Correct limit switch mounting places the actuator where the machine target reaches the operating point consistently, travels far enough to create margin, and stops before the switch is mechanically overloaded. Repeatability depends on the complete system: bracket stiffness, target geometry, approach direction, speed, actuator type, bearing play, temperature, contamination and electrical response. A precise switch on a flexible bracket will not produce a precise machine reference. This guide gives an OEM mounting and validation process using LEMA HL-series products as real visual references. Product photos show the physical family only. Confirm the exact operating position, movement differential, overtravel, allowable force, approach angle and enclosure data from the controlled model drawing. Mounting decisions at a glance DecisionPreferred practiceRisk if ignoredVerification BracketRigid, located by repeatable datumsPosition drift and vibrationDeflection check and torque record ApproachFollow permitted actuator directionSide load, impact or lever damageSlow-motion observation Operating marginTarget passes operating point without exceeding limitIntermittent actuation or overtravelWorst-case tolerance test Target surfaceSmooth, durable and correctly profiledWear, bounce and inconsistent releaseInspection after cycling CableSupported with strain relief and service loopTerminal load or water pathPull and routing inspection Machine referenceDefined independently of switch housingUncontrolled calibration changesGauge or fixture measurement Define what “repeatability” means Repeatability is the spread of switching positions when the same mechanism approaches under the same conditions. It is not the same as absolute accuracy. A switch can repeat closely but actuate at an offset from the desired machine coordinate. A system may also change with approach direction because mechanical backlash, lever friction and movement differential create hysteresis. Write an acceptance statement with units and test conditions. For example: “input changes state within the approved position band during ten forward approaches at production speed and releases...
↗Micro Switch for Inductive Loads: Rating and Protection Guide
A micro switch for an inductive load must be selected from the load’s making and breaking behavior, not from a resistive current number alone. Solenoids, relays, contactors and small motors can draw inrush current and create a voltage spike when the circuit opens. Those effects can erode or weld contacts, produce electrical noise and shorten service life. The safe method is to identify the actual load, check the exact switch rating for that load category, keep margin, and use a suitable suppression or interface device when the switch data does not directly cover the duty. This guide explains the engineering questions behind that choice. LEMA KW12-series images are used as real product references, but the photographed appearance does not prove a particular inductive-load rating. Confirm the ordering code, datasheet, circuit voltage, current, operating rate and environmental conditions before approval. Why an inductive load is harder on contacts An energized coil stores energy in its magnetic field. When a mechanical contact opens, current tries to continue flowing. The resulting voltage across the opening gap can create an arc. At closing, a motor or transformer may also draw a current higher than its steady-state value. A switch that carries a small resistive heater current comfortably can therefore fail early when used at the same nameplate current with a coil or motor. The problem is not solved by looking only at watts. AC and DC arcs behave differently, coil time constants differ, and the contact material, gap, speed and enclosure all affect interruption. Treat “inductive” as a prompt to obtain the exact switching category and test conditions rather than as a universal derating percentage. Selection table for common inductive duties LoadMain stressInformation requiredTypical...
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