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Weg
CWM18-00-20V04
Contactor, IEC, 18 Amp (18A), 2NO, 20V 50Hz/24VAC 60 Hz, Screw Terminal, 81 x 45 x 87mm (3.19 x 1.77 x x 3.43"), IP20, CWM Series
$36.87$36.87 -
Available Now! 
Available Now!Weg
CWM18-01-30V18
Contactor, IEC, 18 Amps, 1NC, 120VAC, 3-Pole, UL508, Use RW Overload Relay
$52.02$52.02 -
Weg
CWM18-10-30V56
IEC Contactor, 18 Amp (18A), 3 Pole, 3NO, 600VAC, UL508, Screw Terminal, 81 x 45 x 87mm (3.19 x .77 x 3.43") (HWD), IP10 Main Circuit, IP20 Control Circuit, Use RW Overload Relay
$52.02$52.02 -
$111.10$111.10 -
$111.10$111.10 -
$142.41$142.41 -
$113.63$113.63 -
Weg
CWM630-22-30E39
Contactor, IEC, 630 Amps, 2NO/2NC, 200-240VAC/DC, 3-Pole, UL508, Use RW Overload Relay
$2,252.30$2,252.30 -
Available Now! 
Available Now!Weg
CWM65-00-30V04
Contactor, IEC, 65 Amps, 24VAC, 3-Pole, UL508, Use RW Overload Relay
$128.78$128.78 -
$210.59$210.59 -
$36.36$36.36 -
$227.25$227.25
A motor starter is a contactor plus an overload relay; without an overload it is just a contactor.
A motor starter starts and stops a connected motor load and will provide protection in case of a sudden loss of power or if the motor overloads. A contactor is similar to a relay (but can handle larger amounts of electrical power and handle higher voltage loads) and is used for switching current on and off in a circuit. Contactors are used to control electrical loads and motors without providing overload protection.
a.k.a. motor starter, IEC contactor, dp contactor, thermal overload relay, motor protectors