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PMDX

an affiliate of Practical Micro Design, Inc.

Products for CNC and motion control applications since 1998.
Design, manufacturing, and support based in the USA.

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Contactor

Model PMDX-ContactorMD20-120

20 Ampere Medium Duty Power Contactor,
120 VAC coil and crimp connectors

 

This contactor has 2 poles for switching both sides of a single phase load. 

All connections are quick connect lug style terminals. We include 8 crimp type connectors for the terminals. Six are needed and we supply two spares. These connectors will crimp onto 18-AWG, 16-AWG, or 14-AWG stranded wire.

The contactor is mounted by two screw holes in its base. The distance between the holes is 60 MM.

This contactor is rated to switch motor loads of up to 20 amperes at 120 VAC or 240 VAC. It is not designed to switch DC powered loads, but it can switch the AC input to spindle drives that power DC motors. This is useful to provide fail save start/stop capability for small machines with DC spindle motors.

The PMDX-ContactorMD20-120 is activated by a coil that requires 120 VAC at 25 mA or less. This contactor may be directly operated by switching 120 VAC through the RUN and COM output terminals of PMDX spindle controllers including the PMDX-106, PMDX-107, and PMDX-407.

A contactor is a special purpose power switching relay. They differ from ordinary relays in that the contacts have an enhanced arrangement of two sets of contacts in series for each pole. These contacts are mechanically arranged such that even if one of them should weld closed, the other can still open. This is a safety feature to help assure that the motor or other load can be turned off despite minor failures.

The coil of a relay will produce a Back-EMF voltage spike when it is turned off, so it is a good idea to provide a suppression device such as a Transorb or MOV across the coil or across the device switching it on and off. This will prolong the life of the device switching the contactor and reduce electrical noise spikes that can upset other electronics in a control unit. Most PMDX breakout boards include suppression devices for this reason.

We also offer three phase contactors. See our offerings HERE.

If you need a contactor with other ratings or with overload sensing, we recommend visiting the web site of Automation Direct.

The PMDX-ContactorMD20-120 is priced at $16.00

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