Trying to figure out exactly what this is. I have a battery powered backpack sprayer. Obviously was not working. Traced the power until I found the break in the line and it is this critter. This is inline between the switch and the pump. The pump just pumps air into the tank pressurizing it. The pump works fine bypassing this component. The numbers on the component indicate 5amps/250volts. I am guessing is a current limiter or possibly an inline circuit breaker. Guessing that as the pressure increases it causes the pump to draw more current until 5amps cuts it off thus stopping the sprayer from over pressurizing. The problem is as much as I’ve searched I can’t find one like it online so I’m not quite confident in my reasoning. Dosas anybody actually know what this is and where I can get one?

 

It looks like a switch to me.
Does the top part move in and out?

 

Looks like a snap action micro switch button activated. 5 Amp 250 Volt. I am just unsure of the pinout. Haven't seen one quite like what you have.

Ron

 

If it's mounted to the tank it may be that as the tank is pressurized it distorts in a way that activates the switch. I have to agree a switch is most likely what it is. A circuit breaker would keep resetting and eventually either burn out the motor, or over pressurize and blow out a safety valve.

 

It looks like a switch to me.
Does the top part move in and out?

Yes it does compress. However it is/was mounted inside a housing with no way for it to be manipulated.

 

Is it a tamper switch? Does a panel operate it?

If so, you are following a false lead, its job would be to break the power if the unit was opened.

 

Looks like a snap action micro switch button activated. 5 Amp 250 Volt. I am just unsure of the pinout. Haven't seen one quite like what you have.

Ron

I suppose. But as I replied above…it is/was mounted inside a housing with no way for the button to be manipulated. I did put a meter on the various pins and depressed the button to check continuity but given that the part is bad; I’m not sure what I thought I was going to accomplish

 

Well why not remove it and move on?

 

It looks like a switch to me.
Does the top part move in and out?

Yes like a small spring loaded button

 

Well why not remove it and move on?

I did and it works. But I’m guessing that it somehow interrupts the circuit to shut the pump off and prevent over pressurization. The manufacturer only allows for the purchase of an entire pump assembly. Given the cost of that I will just use it as is until I burn the pump up then replace entire thing. But if someone can identify this critter and maybe I can pay 5-10 bucks and fix it correctly and move on that would be better

 

Is it a tamper switch? Does a panel operate it?

If so, you are following a false lead, its job would be to break the power if the unit was opened.

Hmmm. Possibly. I hadn’t considered that.

 

Hmmm. Possibly. I hadn’t considered that.

It does run when I bypassed it. I haven’t just let it run to see if it shuts off when up to pressure. I didn’t want to risk over pressurizing and cook the pump. Maybe I should give that a go

 

It does run when I bypassed it. I haven’t just let it run to see if it shuts off when up to pressure. I didn’t want to risk over pressurizing and cook the pump. Maybe I should give that a go

I would confirm that where it is mounted it is actuated by something once it is assembled. That would give a bit more confidence that it is, in fact, a tamper switch.

 

I suspect that 4 & 3 are normally closed and 1 & 2 are normally open. Is there any text on the other side or along the edges?

 

https://sa.rsdelivers.com/product/c...olyamide-housing-250v-ac-max-175a-max/0539319

getting close

 

I suspect that 4 & 3 are normally closed and 1 & 2 are normally open. Is there any text on the other side or along the edges?

Like the switch you posted, it has symbols the terminals indicating NC and NO functions.