20 Ampere Medium Duty Power Contactor,
120 VAC coil and crimp
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
For International customers or for alternate payment
options - click HERE