Questions tagged [contactor]

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Unsure if motor starter (contactor + overload) is needed instead of normal solid state relay

I am designing a system with several pumps ranging from 0.5 to 1.5 HP (all single phase) and am unsure of what kind of circuitry I need. I researched different motor contactors and overloads I could ...
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28 views

Starter for Sump Pump

I'm trying to determine proper circuitry for starting a sump pump, but am unsure of what components I need. Originally was going to just use a relay, but have read suggestions for contactor+overload ...
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1answer
49 views

What is the purpose of these coils in contactor auxiliary contacts?

Can someone please tell me what the function of this module, and more specifically, the curley wires on top of this contactor? It looks like the wires go to the same terminals as the main contactor ...
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13 views

Contactor utilization category

Is a contactor of utilization category AC-1 applicable to switching a whole single-family house (of say 65A, 30kW @ 230V) on or off? Since AC-1 means "Non-inductive or slightly inductive loads, ...
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1answer
116 views

\$\mu\$ Symbol on a Relay Module's Nameplate

One of our customers gave us a sample product for inspection. It has a relay output for 220V loads (e.g. fan, bulb, etc.) Just out of curiosity, what is the meaning of the \$\mu\$ symbol here?
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2answers
67 views

How to control one motor with two float switches

I have 2 tanks , one is under another and hopes to pump from under tank to upper one using a 0.5 Hp single phase motor.By connecting float switches for both tank,can I control the motor to turn on ...
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3answers
1k views

DC Relay overrated for max. 100ms

In my case I need a relay to switch continous 0.5A at 24V DC, but in time of closing the contacts there will occour an inrush current from the further circuit of 6A, but only for max. 100ms because ...
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1answer
30 views

What kind of contactor or device do I need to keep a contactor closed until power draw of the primary circuit is complete?

I have an application where I need to signal a start by sending a 120V signal to the contactor, so it will close a 208V 3 pole circuit. The load on the circuit will run for an unspecified amount of ...
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1answer
23 views

Can I use solid state output and relay output with the same components?

So I have a OTB1E0DM9LP Schinder Electric I/O distributed module and I want use it'output to control some 24v electro-valve's and some 24V contactors. The module have 2 Solid-state outputs of 24V 0....
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2answers
138 views

Using PID relay to drive multiple contactors

I am a physicist by training but have been tasked with designing a heating controller box for a custom application that will be used in an industrial setting. I would like to make sure that I am ...
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1answer
268 views

What is the coil voltage of this contactor?

Sorry for dummy question but I don't know how to identify the coil voltage necessary to activate this contactor? Thank you
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1answer
112 views

Switching 400V motor with 5V

I'am trying to make an automatic irrigation system using an Arduino, a moisture meter and a water pump. The issue is that I can't figure out whether there is some relay/contactor type component that ...
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2answers
142 views

Contactor: when and how to use it

I hope my question is not too stupid. I'm controlling a brushed 48V 50A motor with a motor controller and I use two gel batteries as a power supply. I would like to use a low power signal to switch ...
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29 views

What is the max current of this contactor? CDC65-24

I'm attempting to power a 50kW DC Fast Charger with 3 phase 277/480V. It needs ~55kW which is 66A per phase. I'm trying to find a contactor. This one is CDC65-24. It is a 3 pole, 100A continuous. ...
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1answer
63 views

Two Switches to Control a Pump

I have a water tank that I want to fill up with a well. I have a float switch at the top of the tank and another float switch in the middle of the tank. What I want to do is have the pump only turn on ...
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1answer
213 views

Vacuum Contactor Wiring Diagrams

In reviewing the following wiring schematics for a vacuum contactor, I can't wrap my head around why things are the way they are. Source > Downloads > Catalogues Wiring Diagram #1, Size 4 Contactor ...
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1answer
161 views

How to connect voltage protection relay to contactor?

Could you help me connect a voltage protection relay (VPR) to a contactor? I'm not sure how to connect the relay output terminals (NO, NC, COM, etc.) to contactor control terminals A1 and A2 in the ...
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2answers
67 views

Digital control of contactors

We are trying to control a bunch of 3 phase contactors using an HMI. The contactors' coils are activated by two lines of the 240V 3 phase source (L1 and L2). We are trying to figure out if the ...
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1answer
44 views

Can a contactor be used as a temporal logic bit as in PLC?

I want to design a control logic circuit using relay logic. I want to have a bit as a marker as in PLC. Can I use a contactor for this function and then use auxiliary coils as a latch as in PLCs.
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1answer
119 views

Which suppresor device will be use for 2pole AC contactor 240v coil voltage in coil as well as contact side?

I need an AC contactor for a 1 hp motor. For the contactor safety I'm goint to use the suppression device on the both coil and contact side. Please suggest me which suppressor device will be use! I ...
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1answer
167 views

How Does Line Frequency Affect Coils of a Contactor?

I am using a generator as my source voltage, which produces 240VAC @ 240Hz. I was planning to use the following contactor from TE: CONTACTOR 4PST 40A 240V In the datasheet it says this contactor's ...
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3answers
4k views

What lubricant is suitable for switch contact?

I have this expensive DPDT switch (20A 250V 2hp) which the only problem is dirty encumbered inside. The encumbrance is made of carbonized material and some kind of wax and dirty electrical contacts. ...
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1answer
179 views

Auxiliary contacts on contactor to power solenoid valve

I'm just trying to introduce cold water in to industrial shredder. Connected cold water supply to machine. That's not good because when I forget to turn off water it will overflow. I have not seen ...
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0answers
56 views

Why are contactor coils connected to two different safety relay outputs?

When looking through a manual for a safety relay, I began to wonder why the coils of the load contactors (K3 and K4 on pages 14-15) are always connected to two different NO contacts of the safety ...
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3answers
2k views

Are three-phase contactors rated per pole or in total?

Are three-phase contactors rated per pole or in total? For example, have a look at this datasheet for a random three-phase contactor: datasheet In the datasheet it says that for AC-3 loads (1) the ...
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0answers
62 views

Switching a power contactor from an arduino / raspberry

I'd like to switch a power contactor (such as this one : https://www.legrand.fr/pro/catalogue/31925-bipolaires-250-v/contacteur-de-puissance-cx3-bobine-230v-sans-commande-manuelle-2p-250v-25a-contact-...
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1answer
119 views

CC12 Contactor is Confusing

I am attempting to use this relay, the CC12, to turn the 120VAC power to a motor/motor controller on and off using a 24VDC signal (These voltages are specified in the datasheet.), and I've gotten ...
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1answer
537 views

IGBT contactor design

I found this circuit in an older post. I was thinking about using this in place of a contactor to break under load. The load would be at 500V 300A DC. There would be overcurrent protection in line ...
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0answers
246 views

Controlling 2-pole contactor using Arduino

I am working with Packard C230C contactor to develop own EVSE. For a simple start i just want to toggle contactor using Arduino. OpenEVSE is already doing it. Just want to know how do they do it and ...
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2answers
285 views

Contactor/relay rating for bypass function of soft start circuit

I am designing a soft start circuit for a 70KVA, 70A, 480/230 delta/star transformer, since the fuses kept blowing without. I've been using 3 NTC thermistors rated for 80A in series with the lines ...
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2answers
357 views

Automatic cut mains power on a thunderstorm

I am a software engineer with only a basic experience with electric/electronic engineering. I live in a rural area subject to thunderstorms, my house is the end of the line from street poles. It's ...
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2answers
190 views

Industrial contactor frequency influence

I'm thinking of using industrial motor contactors at the output of a 3-phase electrical generator. An example here : CONTACTOR DATASHEET The only difference / problem is that the electrical ...
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2answers
2k views

About Contactor Lifespan

Newbie here regarding contactors and relays, i had this contactor datasheet https://www.gavazzionline.com/pdf/CC50-CC65.pdf. I'm trying to identify how long the contactor would last and I find the ...
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2answers
4k views

Contactor's Coil Current

YuCo YC-CN402-24V CN-PBC402-24V DEFINITE PURPOSE CONTACTOR with a Packard PF42440 Control Transformer Class II Foot Mount 40VA 24V to activate the 2vac coil. The circuit is a 220v 20amp motor. My ...
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1answer
39k views

Problem in star delta starter in air compressor

I am a beginner in electrical engineering. I am trying to understand how motors are connected in a star and delta system. I studied the star delta starter from this link. It describes the connection ...
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1answer
279 views

Which relay will last the longest?

I'd like to control a 20 amp, 240 volt AC resistive load with a heavy duty contactor. The contactor I have is a Siemens 3TX7130-0DB03 rated for 30 amps, and DPDT. I was originally going to switch ...
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1answer
2k views

Starting (inrush) current of a resistor (heater)

We are going to purchase a 48kW electric drying oven. As we know the AC motors have big starting current and a special starting equipment is needed - Star-delta, soft-starter, inverter and etc. What ...
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1answer
601 views

Can I operate a 120VAC contactor with a DC power supply

If yes, What would be the voltage and amperage for DC to operate the 120 VAC contactor? And, Can I connect two contactors in parallel, and actuate both using DC ? I need it for a project, where I can'...
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5answers
10k views

Contactor vs Relay

As known, contactor is used to switch higher capacity than relay. But there some relays can switch high current too, such as, some power relays can switch current beyond 100A, and there are contactors ...
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1answer
572 views

Interface Submersible water pump with microcontroller using Contactor Relay

I am making a automatic water level controller for my home,I am new to Electrical Engineering and learning things. I am using a MCU to turn ON/OFF submersible water pumps using some float switch to ...
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0answers
281 views

Trailing edge dimmer to activate relay/contactor

I would like to take the 240V feed from a trailing edge dimmer that is driving LED lamps and use it also to activate a contactor or relay. This would in turn run a 230V fan. (Reason: want to have a ...
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1answer
76 views

Using regulator capacitor bank for a motor

I want to use a regulator capacitor bank in a small facility that has a machine so based on the power factor it insert the capacitors. Each 30 seconds the motor power factor is 0.4 and for 10 seconds ...
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2answers
710 views

switching device for motor

This query is from my project on automatic motor switching of water tank. My question is that what should be the rating of switching device(relay or contactor) for single phase induction motor (2hp 8A ...
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2answers
510 views

Suggestions on how to control a 1000W DC motor

I would like to find out the best solution to safely control two 1000W DC brushed motors by using a atmega328p. In particular, the DC motors are rated: 1000W, 50A, 24V, 2400 RPM. I have a radio ...
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1answer
789 views

Main contactor of star delta motor starter

Why do some control circuits of star delta starter use two normally open auxiliary contacts of the main contactor and others use one? To me only one normally open should be enough. Can a contactor ...
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1answer
120 views

can contactor, water level sensor and heater all live in parallel on the same circuit

I want to connect my 3000w (220v) water heating element to a 220v water level sensor Automático de Nível so that the heating element won't turn on when there is no water present. But the level sensor ...
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2answers
4k views

Automatic transfer switch VS Using a Reversing Contactor with Circuit Protection

We have a an industrial control system that utilizes a 480VAC 3 phase 10 Amp service. For redundancy reasons, we wanted to add an automatic transfer switch to the system to switch between two ...
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1answer
505 views

Mechanical Contactor for High Voltage DC - Substitute with Semiconductor

To switch 1kV DC at 5A, I usually use a mechanical contactor (<- Wikipedia) that switches both highside and lowside of a resistive load. Any suggestions on a semiconductor (or non-mechanical part) ...
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3answers
502 views

Contactor control circuit overvoltage

I have a 12VAC-controlled contactor (ESB 20-20, rated for 12V @50Hz), and a 220/12 transformer that I intend to connect to the contactor. Unfortunately, rather than 12V, the transformer outputs 14V (...
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1answer
459 views

Correct design for large contactor circuit?

After some advice here I'm wondering if this is the correct design of my circuit. I'm now using a SSR as the control device to the contactor. The diode, I believe, should not only protect the SSR ...