Limit Switch Manual Reset Roller Lever 1NO 1NC C025841A0 TER

The TER C025841A0 is a roller lever limit switch with a manual reset mechanism. A standard limit switch returns to its normal state as soon as the moving part leaves, but this one latches. Once the roller lever is operated, the contacts stay changed over until someone walks to the switch and presses the reset. The machine cannot restart on its own.

That behaviour is the whole point. On an overtravel limit, a jam detector or a safety related stop, an automatic reset could let a machine move again the moment the fault clears itself, before anyone has checked why it tripped. Manual reset forces a human to look at the machine first, which is why this type is specified on lifts, presses, conveyors and guarded equipment.

The roller on the lever reduces friction and wear where a cam or moving part slides past repeatedly, so the trip point stays consistent over long cycle counts. Contacts are 1NO and 1NC with snap action, rated AC15 400V 4A, which is the correct rating class for switching contactor coils in an inductive control circuit. The metal body is IP66 sealed against dust and heavy water jets, with a single M20 gland entry and a compact 30mm width. Manufactured in Italy by TER.

Key Features

• Manual reset holds the tripped state until an operator resets it

• Roller lever reduces friction and wear from sliding cams

• Snap action 1NO and 1NC contacts for fast, clean switching

• AC15 400V 4A rating suited to contactor coil switching

• IP66 metal body resists dust and powerful water jets

• Compact 30mm width fits tight mounting positions

• Single M20 cable gland entry

• Manufactured in Italy by TER

Technical Specifications

Common Applications

Overtravel and end of stroke protection on lifts and hoists, jam and blockage detection on conveyors, press and shear guard interlocks, gate and barrier overrun limits, machine tool travel limits where restart must be supervised, and any safety related stop that should not clear itself automatically.

Choosing the Right Limit Switch

The first decision is whether the switch should reset itself or hold. Automatic reset suits routine position sensing and sequencing. Manual reset suits fault and safety stops. Where the trip needs to happen anywhere along a run rather than at one fixed point, the cable pull limit switch C55579800C3 uses a rope along the machine and also latches until reset.

For standard automatic reset duty, smaller units cost considerably less. The adjustable roller lever limit switch AZ-8108 covers 5A work at IP65 with a settable lever, the lever limit switch AZ-7120 is a compact side mount option, and the roller plunger limit switch AM-1308 handles 15A through a top roller.

For heavy plant, the big wheel limit switch AZ-5108L gives an oversized wheel with IP67 sealing for lifts and cranes, while the spring limit switch AZ-8166 flexes rather than breaking when a load overruns.

Browse the full 5 amp mini limit switch range or the wider limit and micro switches category.

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 product from the original manufacturer. 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 or technical help.

FAQ,s

What is a roller lever limit switch?

It is a position switch operated by a lever with a roller at the tip. A cam or moving part presses the roller, the lever rotates and the internal contacts change over to signal the controller.

What does manual reset mean?

The switch stays tripped after it operates. The contacts hold their changed state until someone presses the reset on the switch body, so the machine cannot restart on its own once the limit has been reached.

When should I use manual reset instead of automatic?

Use manual reset on overtravel limits, jam detection and safety stops, where a person should inspect the machine before it runs again. Automatic reset is fine for routine position sensing and sequencing.

What does snap action mean?

The contacts change over quickly and completely once the actuator passes its trip point, rather than moving gradually. That reduces arcing and gives a clean, repeatable switching signal.

What does AC15 400V 4A tell me?

AC15 is the utilisation category for switching electromagnetic loads such as contactor coils. It means the switch is rated to handle the inrush of an AC coil at up to 400V and 4A.

Is IP66 suitable for washdown?

Yes. IP66 means the body is dust tight and protected against powerful water jets, which covers washdown areas, outdoor plant and heavy industrial environments.