These Contactors are mainly used as High current Switches used between the Battery Pack and Controller. Single Pole/Single Throw. The Contactor Coil Ratings are determined by the voltage input used to switch on the Contact
You can find more Reversing Contactors and OEM and qty pricing at PowerTronX.com
Reversing Contactors are mainly used as "Reversing" such as reversing the direction of a DC Motor.
These are usually wired between a DC controller and Motor
Single on/off 12 volt Contactors and the Contactors rated
over 96 Volt and over can have "Blowout" Magnets as these voltages, when used in "High" amp situations, may need to to Turn
off or On while under Power. The Magnetism Helps direct and reduce the
“Spark” emitted when the Contactor “Engages”.
Reversing Contactors do not need magnets as power is always off when the Reversing Contactor is switched. We add a “B” at the end of a Contactor Model
Number with these strong Magnets.
Example: SW200-12B, the “B” stands for
“Blowout” Magnets are included in the Contactor. Albright SW200 Contactors usually have the Magnets in all voltages in On/Off Voltages. (Without the "B" in the part number)
Adding these Magnets do add to the cost of the Contactor and the benefits can be minimal.