Top Plunger Limit Switch Manual Reset 1NO 1NC IP66 C025811A0 TER

The TER C025811A0 is a top plunger limit switch with manual reset, built for positions where the machine must stay stopped after the switch trips. A standard limit switch resets itself the moment the moving part backs off, which is fine for sequencing. This one latches. Once the plunger is pushed, the contacts stay changed over until somebody walks to the switch and resets it by hand.

That behaviour is the whole point. On overtravel protection, guard monitoring and emergency limits, you do not want the plant restarting simply because a carriage rolled back a centimetre. Manual reset forces an operator to attend the machine, see what caused the trip and deliberately clear it before anything moves again.

The top plunger takes a direct push in line with the body, so it suits a cam or stop block arriving straight onto the switch. Snap action contacts change over quickly and cleanly regardless of how slowly the plunger is pressed, which keeps arcing down and the signal crisp. The metal housing is IP66 rated against dust and powerful water jets, with a single M20 gland entry and a 30mm width that fits tight mounting positions. Made in Italy by TER, rated AC15 400V 4A for direct contactor coil switching.

Key Features

• Manual reset holds the trip until an operator clears it by hand

• Top plunger accepts direct in line actuation

• Snap action contacts switch cleanly at any actuation speed

• 1NO and 1NC contacts for signal and interlock together

• AC15 400V 4A rating drives contactor coils directly

• IP66 metal housing resists dust and powerful water jets

• Compact 30mm width with a single M20 cable entry

• Manufactured in Italy by TER

Technical Specifications

Common Applications

Overtravel protection on lifts, hoists and cranes, guard and access door monitoring, end of travel limits on presses and slides, safety stops on gantries and conveyors, machine tool overrun protection, and any position where a trip must be investigated before the equipment is allowed to run again.

Choosing the Right Limit Switch

Reset behaviour is the first thing to settle. If the machine should carry on automatically once the part clears the switch, an auto reset model is cheaper and simpler: the roller plunger limit switch AM-1308 takes a direct push like this one but resets itself and carries 15A.

For manual reset on a long run, where a person needs to stop the line from anywhere along its length, the cable pull limit switch C55579800C3 uses a tensioned rope instead of a plunger and shares the same IP66 metal build and manual reset action.

Where the moving part arrives from the side or at an angle, a lever or roller suits better. The lever limit switch AZ-7120 is a compact side mount option, the adjustable roller lever limit switch AZ-8108 lets you set the lever length, and for heavy plant the big wheel limit switch AZ-5108L tolerates misalignment at IP67. Where an overrun could snap a rigid actuator, the spring limit switch AZ-8166 flexes instead.

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. 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 top plunger limit switch?

It is a limit switch actuated by a plunger on the top face. A cam, stop block or moving part presses straight down onto the plunger in line with the switch body, which changes the contacts over.

What does manual reset mean?

The switch stays tripped after it operates. Even when the moving part backs away, the contacts hold their changed state until an operator presses the reset on the switch itself.

When should I use manual reset instead of automatic?

Use it on overtravel limits, guard monitoring and safety stops, where a trip needs to be investigated before restart. Use automatic reset for routine sequencing and position signalling.

What is snap action?

Snap action means the contacts flip over quickly under spring force no matter how slowly the plunger moves. That keeps arcing low and gives a clean signal even on very slow approaches.

Can it switch a contactor coil directly?

Yes. The AC15 400V 4A rating is an inductive rating for exactly this duty, so the switch can drive a contactor coil without an interposing relay.

Is IP66 enough for washdown areas?

 Yes. IP66 means the housing is dust tight and withstands powerful water jets, which covers washdown, outdoor and heavy industrial conditions.