The Moujen ME-8122 is a mini limit switch 5A IP65 rated, fitted with a cross roller plunger head. The roller sits across the top of the plunger on its own axis, which means the switch accepts a cam coming in from the side as well as straight down. A standard roller plunger only works with a direct downward push, so on machinery where the approach angle is not fixed, the cross roller is what keeps the switch operating instead of binding.

Because the roller turns rather than scraping, the trip point stays consistent over long cycle counts. A plain plunger head wears flat where the cam rubs it, and that wear slowly shifts the position the switch operates at. On indexing tables, sliding guards and cam driven sequences that run thousands of cycles a week, that difference decides how often the machine needs recalibrating.

It is rated 5A at 250V AC resistive and 0.4A at 115V DC, which covers control circuits and PLC inputs. The IP65 body is dust proof, oil tight and water resistant with stainless steel internals, so it holds up around coolant and washdown. Operating speed runs from 0.5mm up to 50m per second, so it suits both creeping movement and fast lines. UL and CE approvals cover it for export machinery.

Key Features

• Cross roller plunger accepts angled and straight approach

• Roller turns instead of scraping, keeping the trip point stable

• 5A at 250V AC and 0.4A at 115V DC resistive ratings

• IP65 sealing with dust proof and oil tight construction

• Stainless steel internal parts resist corrosion

• Wide operating speed range from 0.5mm to 50m per second

• Compact 0.2kg mini body fits tight machine spaces

• UL Listed and CE Mark certified, made in Taiwan

Technical Specifications

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Common Applications

Cam operated sequencing on indexing tables, sliding guard and cover position detection, tool changer and turret position confirmation, packaging and assembly machinery, small conveyor stop positions, jig and fixture detection, and any point where the cam arrives at an angle rather than straight onto the plunger.

Choosing the Right Limit Switch

The actuator has to match how the moving part arrives, so that is the first thing to settle. A cross roller plunger suits angled contact in a confined space. Where the target sits away from the switch or the contact point varies, a lever reaches out to meet it: the adjustable roller lever limit switch AZ-8108 shares the same 5A IP65 rating with a settable lever length, and the adjustable rod limit switch AZ-8107 uses a flexible rod for long reach onto irregular targets.

For straight travel along a frame, the lever limit switch AZ-7120 is a compact side mount option. Where an overrun could snap a rigid actuator, the spring limit switch AZ-8166 flexes and returns instead of breaking.

Heavier duty needs a bigger body. The roller plunger limit switch AM-1308 carries 15A and can switch a quarter HP motor directly, the 10A adjustable roller lever limit switch AZ-5108 steps up to a metal body, and the big wheel limit switch AZ-5108L is IP67 rated for lifts, cranes and outdoor plant.

Browse the full 5 amp mini limit switch range or the main limit and micro switches category, which also covers 10A, 15A and foot switches.

Why Buy From Qahraba

Qahraba supplies electrical contractors, panel builders and machine builders across the UAE and worldwide. Every limit switch we stock is genuine Moujen or Auspicious product with full certification. Local UAE orders ship within 1 to 2 working days, free above AED 250, or collect free from our Dubai store. Call or WhatsApp +971 52 913 9543 for bulk pricing.

FAQ,s

What is a cross roller plunger limit switch?

It is a limit switch with a small roller mounted crosswise on top of the plunger. The roller lets a cam push the plunger from the side as well as from directly above, so the switch works where the approach is not perfectly vertical.

What does IP65 mean on a limit switch?

IP65 means the body is fully dust tight and protected against low pressure water jets from any direction. That covers machine shops, coolant spray and light washdown, but not immersion.

What load can a 5A limit switch handle?

Up to 5A at 250V AC resistive and 0.4A at 115V DC. That is enough for control circuits, contactor coils and PLC inputs, but not for driving a motor directly.

How is this different from a standard roller plunger?

A standard roller plunger only takes a push straight down. The cross roller accepts contact at an angle, which prevents the plunger binding when the cam comes in from the side.

Can it be used on fast moving machinery?

Yes. The operating speed range runs up to 50m per second, with a lower limit of 0.5mm per second for slow creeping movement.

Does it come with a mounting bracket?

The switch ships as a standard ME series body. Contact us on +971 52 913 9543 if you need mounting accessories or a different actuator from the same series.