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A dry is a potential free A dry is a that does not provide voltage. For instance, the push-to-talk switch of a microphone, which just closes a circuit without providing voltage. A wet is a that will provide voltage when closed, like the switch on the wall that activates the 110 VAC outlet to turn a lamp on in a room. Potential free , voltage free and dry , they all are same. The dry is the which is physically operated with the main device, but not electrically connected to it. It is a voltage free on/off and can be used in any system. The auxiliary of the motor or used for the motor run feed back is the example of the dry . The s of the interposing relays are also dry s. - MS

Perhaps you mean "dry circuit"? s which need to work in such circuits are generally gold-plated, since the current and voltage levels are too low to break down the contaminant layWhat is a volt free ? Answer: A volt free is a set of s that uses a voltage source from another location. The s are used to tie two individual pieces of electrical equipment together so the action on one will cause the other piece of equipment to operate. It is just a new way of using the older terminology "dry s". An example of use is the diesel start s on an automatic transfer switch. When the transfer switch is in the utility (hydro) position the diesel start "dry s" located in the transfer switch are open. On a power failure the transfer switch disconnects from the utility and connects to the generator position. When the transfer switch moves to the generator connect side the "dry s" , or volt free s, in the transfer switch close. This allows a voltage from the generator control (usually 24 volts DC) to return to the start relay located in the generator control . This relay engages the starter and starts the diesel generator. On return of utility power the reverse action takes place and the volt free s return to their normal state of normally open.er on conventional s...

Generally that means the open circuit voltage is 20mV or less and the short circuit current is 100mA or less.

Potential /Volt free" or "dry s" are used when the equipment being controlled has its own power supply e.g.,PLC's have a 24 VDC power source in them . The external used to start the motor/equipment is a dry , and it switches the voltage supplied by the PLC's .The output modules in PLC uses Interposing relay connected to MCC , the dry connects the drive input to the PLC's 24 VDC and powers the drive circuit input. The internal devices sense the voltage, start the drive, and the current and voltage is returned to the PLC's own power supply through internal circuitry. A volt free is a without any voltage on it. It is usually supplied in a system for other parties to use and they then supply their own voltage into their own system eg: to a BMS system. A dry is just that - dry - as opposed to a wet that is usually something like a mercury switch or it can also have a mercury wetted . A proximity is one I have never heard of but would assume it is meant to be a proximity switch of somw type, probably with a transistor output of the open collector variety.

Volt-free and dry mean the same thing. If a control system supplier offers a dry for you to read as a status bit, then he is offering to close a (relay or output) that is nothing more that a stand-alone set of s with no voltage, current, or anything else impressed across the set. It becomes the 's responsibility to determine how to sense that closure. Usually you do this by putting a voltage on one side and sensing the voltage on a return line from the other side of the when it closes. Once you apply voltage to the s, it becomes a wet . You "wet" the with a sensible voltage level. A proximity is a set that makes without any kind of direct coil or physical actuation of the set. Proximity s or switches are usually either optical devices that switch because a light beam is broken or completed, or in some cases magnetic switches are called proximity s. The set will open or close when a magnet gets close enough to cause the switch action like a door switch on a burglar alarm.