Yueqing Yijin Electronics Co., Ltd.
Life is counted in operations
How long do ac contactors last is the question people ask when they want a year. The YJC1-63 page answers with operations.
Two printed counts sit on that sheet. A calendar year does not.
Life is printed as cycles
The useful unit on this page is a cycle. One close and open is one operation. The sheet does not convert that count into months.
A contactor is a type of relay with a high power rating. Contactors are typically used to control electric motors, lighting, heating, capacitor banks, thermal evaporators, and other electrical loads. The Yijin scope is the household case of that class.
When someone asks for years, write the two life lines first. Then say the page never printed a year beside them. A year would be a guess built on how often the load is switched.
| Question people ask | What the sheet can answer |
|---|---|
| How many years? | It does not print years |
| How many operations? | It prints two life counts |
| Is a buzz the end of life? | It does not print that link |
Two counts are not one count
Mechanical life and electrical life are separate sentences. Mixing them into one larger number hides which duty you care about.
The page says the mechanical lifespan is not less than 1 million cycles and the electrical lifespan is not less than 100000 times. Mechanical life is the mechanism. Electrical life is the current-carrying duty under the utilization category the page is aiming at.
If a load switches once a day, the electrical count lasts longer in calendar time than a load that switches every minute. The sheet still only prints the count. You do the calendar arithmetic yourself, and you label it as arithmetic, not as a page claim.
| Printed line | What it covers |
|---|---|
| Mechanical lifespan | The mechanism, as a cycle floor |
| Electrical lifespan | The current-carrying duty, as a cycle floor |
| Working voltage and current | The load the scope names |
The scope still names the load
Life only belongs next to the load the page describes. A signal relay on a board is not this spare, even if both click.
The YJC1-63 page prints a rated working voltage of 230 V at 50 Hz or 60 Hz and a rated working current of 63 A. The page says the product complies with GB17885 and IEC1095.
It names low-inductance loads and household motor loads. Conventional units are normally open. A normally closed unit is described as a custom build.
A household motor on that voltage is inside the story. A different voltage without a matching sheet is outside it. Life counts do not travel to a body the page never named.
Closing still needs a band
A contactor that never closes cleanly is not “using up” the electrical life line in the way the sheet describes. The control supply has to be in band before you talk about worn contacts.
The page says the contactor can close at any voltage from 80% to 110% of the rated control supply. The page says the release voltage is neither higher than 75% of that supply nor lower than 20% of that supply. Those lines are the control supply band.
If the supply was never checked, stop before you blame the life count. A weak supply can look like a tired contactor. The sheet separates those sentences on purpose.
A buzz is not a year
Noise is a field complaint. Life is a printed floor. They can appear on the same afternoon and still answer different questions.
From the field: On the contactor talk page, a reader asked whether a buzzing sound means the contactor usually needs to be replaced.
Source: Talk:Contactor (Wikipedia talk page).
A later comment on the same page says contactors and large relays may hum or buzz when they are energized with AC power. A hum while the coil is energized is allowed as a description on that talk page.
It is not a printed year. It is not a printed cycle either.
Keep the buzz on the symptom page when you need that conversation. Keep this page for the counts.
The rail is only the mount
A DIN rail is a metal rail of a standard type widely used for mounting circuit breakers and industrial control equipment inside equipment racks. The page names the TH35-7.5 rail.
The rail holds the body. It does not store the life count.
A loose clip can rattle. Seat the clip before you treat the noise as end of life.
The altitude note says the installation is not over 2000 m. That line is a place limit, not a year limit.
A breaker is a different ending
Unlike a fuse, which interrupts once and then must be replaced, a circuit breaker can be reset to resume normal operation. A contactor is a remote switch. It is not that reset, and it is not a sacrificial fuse.
A relay is an electrically operated switch. The contactor page is the high-rating case.
When the question is only “how long,” stay with the two cycle floors. When the question is a trip on overcurrent, open a breaker page instead.
The YJC1-63 modular AC contactor is the sheet with those life lines. The contactor hub collects the other frames if the pole count is different.
Before you promise a year to a stores person, write the two counts and the switching rate you expect. If the rate is unknown, say so. A year without a rate is a story, not a reading of the page.
Say which count you care about. Mechanical life matters when the mechanism is the worry. Electrical life matters when the current-carrying duty is the worry.
Asking for “the life” as one number asks the sheet for a number it did not print.
If the motor starts once an hour in winter and rarely in summer, the calendar stretch of the electrical count changes with the season. The printed floor does not. Keep the floor and the calendar on two lines of the note.
A maintenance note can list the expected starts per day beside the electrical floor. That is your arithmetic. It is not a third life line on the sheet.
Read the request aloud. You want mechanical lifespan, then electrical lifespan, then the load. A request that only says “how many years” will come back as a guess.
Keep a spare frame note beside the life note. Pole count and normally open versus custom closed still matter when the count is finished. The life lines do not choose the poles for you.
If you already replaced a buzzing unit last season, do not reuse that story as a year rating. The buzz page and this page stay separate.
One talks about noise. One talks about printed floors.
A stores person can stock the frame without inventing a warranty year from the cycle lines. Ask for the printed floors and the expected switching rate. Leave the calendar math labeled as math.
Write the duty beside the floors. A pump that starts every few minutes will spend the electrical count faster than a heater that starts once an evening.
The sheet still only prints the floor. Your note has to carry the rate.
If the custom closed build is the unit you hold, say that on the same note as the life lines. The page treats that build as a special order. The cycle floors do not change that fact by themselves.
A buyer who only wants a year will push for one number. Answer with the two floors first. Then ask for the switching rate.
Only after both are on the note should anyone attempt a calendar estimate, and that estimate must stay labeled as an estimate.
Frequently asked questions
These answers stay with the pages opened for this draft.
What did the talk page ask about replacement?
It asked whether a buzzing sound means the contactor usually needs to be replaced. That is not a year question.
What mechanical life does the YJC1-63 page print?
The page says the mechanical lifespan is not less than 1 million cycles and the electrical lifespan is not less than 100000 times. The first half of that sentence is the mechanical floor.
What electrical life does that page print?
The same sentence prints the electrical floor as not less than 100000 times. Keep it separate from the mechanical floor.
Which voltage and current are in the scope?
The YJC1-63 page prints a rated working voltage of 230 V at 50 Hz or 60 Hz and a rated working current of 63 A.
Which close band does the page print?
The page says the contactor can close at any voltage from 80% to 110% of the rated control supply. The page says the release voltage is neither higher than 75% of that supply nor lower than 20% of that supply.
Why is a year not on that sheet?
The page answers with cycle floors. A year would need a switching rate the sheet does not print.
