The TER C025831A0 is a roller plunger limit switch with a manual reset mechanism. A cam or moving part presses down on the vertical roller plunger, the snap action contacts change over, and the switch then stays tripped. It will not return on its own when the part moves away. Someone has to go to the switch and reset it by hand.

That behaviour is the whole point. A standard limit switch resets itself the moment the obstruction clears, so a machine can resume running with nobody aware it ever tripped. A manual reset switch forces a person to attend, look at what happened and deliberately restore the circuit. That is what you want on overtravel protection, guard position and fault detection, where an automatic restart would hide a real problem or create a hazard.

Snap action contacts give a fast, clean changeover independent of how slowly the plunger is pressed, which keeps the trip point precise and avoids arcing at low travel speeds. Rated AC15 400V 4A, it switches contactor coils and inductive control loads directly. The metal body with IP66 sealing handles dust and powerful water jets, so it suits outdoor plant, washdown areas and heavy industrial environments where a plastic housing would not last. At 30mm wide with a single M20 gland entry, it fits neatly onto a machine frame.

Key Features

Manual reset holds the trip until a person attends the switch
Vertical roller plunger reduces wear from sliding cams
Snap action contacts for a precise, fast changeover
1NO and 1NC contacts for signal and interlock together
AC15 400V 4A rating suits contactor coils and inductive loads
IP66 metal body resists dust and powerful water jets
Compact 30mm width with a single M20 gland entry
Manufactured in Italy by TER

Technical Specifications

Specification	Detail
Product Type	5A Mini Limit Switch
Model	C025831A0
Actuator	Vertical Roller Plunger
Reset	Manual
Contact Rating	AC15 400V 4A
Connection	1NO and 1NC, Snap Action
Degree of Protection	IP66
Gland Size	M20
Cable Entries	1
Body Material	Metal
Width	30mm
Brand	TER
Country of Origin	Italy

Common Applications

Overtravel protection on lifts, hoists and gantries, safety guard and access panel position detection, conveyor jam and blockage detection, end of travel stops that must be investigated before restart, press and machine tool interlocks, tank and hopper level trip protection, and any fault condition where an automatic reset would let the machine restart without anyone checking why it stopped.

Choosing the Right Limit Switch

Reset behaviour is the first question, and it depends on whether a trip is routine or a fault. If the switch is simply signalling position during normal cycling, a self resetting model is correct and much cheaper. The roller plunger limit switch AM-1308 uses the same top roller plunger action at 15A and resets automatically.

For self resetting alternatives with other actuators, the lever limit switch AZ-7120 suits side approach, the adjustable roller lever limit switch AZ-8108 lets you set the lever length, and the spring limit switch AZ-8166 takes contact from any direction. For heavy plant outdoors, the big wheel limit switch AZ-5108L and the ball limit switch AZ-5109 are IP67 rated.

Where the trip has to be possible from anywhere along a conveyor rather than at one fixed point, the cable pull limit switch C55579800C3 from TER offers the same manual reset behaviour across a pull wire run. 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 manual reset limit switch?

It is a limit switch that stays tripped after it operates. The contacts hold their changed state even after the moving part clears, and someone has to press the reset on the switch to restore the circuit.

Why use manual reset instead of automatic?

Because some trips should not be forgotten. Overtravel, guard breaches and jams need a person to attend and check the cause. An automatic reset would let the machine restart with the fault still there.

What does snap action mean?

The contacts flip over quickly once the plunger reaches the trip point, regardless of how slowly it was pressed. That gives a precise trip position and reduces arcing at slow approach speeds.

What does AC15 400V 4A mean?

AC15 is the utilisation category for switching electromagnetic loads such as contactor coils. The switch handles 4A at up to 400V AC in that duty.

Is IP66 suitable for outdoor use?

Yes. IP66 means fully dust tight and protected against powerful water jets, which covers rain, hose down cleaning and most outdoor industrial conditions.

What cable entry does it take?

One M20 gland entry, which fits standard M20 cable glands.

Manual Reset Roller Plunger Limit Switch 1NO 1NC IP66 C025831A0 TER