Ampere Turns

Ampere Turns is one of the factors that provides an efficient solenoid. The ampere-turn (AT) is the unit of magnetomotive force, represented by a direct current of one ampere flowing in a single-turn loop in a vacuum.

Example: The ampere-turns for a coil with 1000 turns and a 500 mA current.
N = 1000 turns and I = 500 mA
N = 1000 turns and I = 0.5
NI = 1000 x 0.5
= 5 At
*Magnetomotive force is any physical cause that produces magnet flux.

Application Form

The application form is designed to provide the information required to assess an application.


Steel movable core of the solenoid, used to drive the moving contact assembly.


Auxiliary Contacts

Single pole double throw auxiliary contacts, used for low power circuit, can be utilised on the majority of our contactors. See the product catalogue for ratings.




A variety of mounting brackets are available, as seen within the catalogue sheets and website product page. Generally these are split into a ‘Top hat’ style for mounting parallel to the mounting surface or an ‘L’ shape mounting bracket for mounting 90 Degrees to the surface.



Change Over / Double Throw (DT)

Set of normally open and set of normally closed contactor.

Closed Covers

The aperture usually found in the top cover housing is sealed to form a barrier to assist prevention of airborne contamination into the contact area.


Housed within the magnet frame, the solenoid (coil) is energised to generate the electro magnetic force for moving the armature and thus operating the main contacts.

Our coil winding wire is Class H, rated for 180 Degree Celsius insulation.


Coil Finish

Vacuum impregnated coils are available to safeguard against shock and vibration and / or high humidity.


Coil Suppression

See suppression

Coil Termination

Coil termination is typically via 6.3mm faston spade termination. Flying leads, M5 studs and other termination are available.