Electro Magnet

Alternating Current Solenoid Magnets works generally on the same lines as a switch making “ON” and “OFF” operation of electromagnetic devices.

Up to 500 volts, 50 cycles

A low voltage coil tends to give more power than the one of high voltage and is more robust as it uses thicker wire, voltage limits (high and low) depends on the size of the solenoids and its rating.

A solenoid can be wound for any voltage but even then in general high voltages on the smallest solenoid and very low voltage on the larger AC solenoid are both to be avoided.


The temperature of the coil when passing current is always over ambient room temperature (specifically more whenever a solenoid is enclosed) so care has to be taken in designing and reference temperature is to be taken as 75 Centigrade where as ambient temperature is about 30 Centigrade. In this way the adequate margin is maintained from safety point of view.


Here is some valuable bio-data revealing more working details about AC & DC solenoids which will also help you in selecting the right type for your exact requirement, though in most of the cases it is predetermined.

AC solenoid tends to be more powerful on lower stroke than DC. At the cost of ‘Inrush Current’ which at maximum stroke can more that ten times the closed current. Complete closing is essential to bring this current down to normal.

DC solenoid takes the same current throughout the stroke and does not overheat even it sometimes incomplete closing occurs by chance.

AC operations is usually faster as compared to DC but even then depends on variations in response time in energizing the solenoids.

DC solenoids can repeat closing accurately against a given load.

A good AC solenoid if correctly used should be quite when closed, but it has fundamental tendency to produce hum and can be overcome by correct design and accurate assembly. Dirt on the mating faces or mechanical over load, may also make it noisy DC solenoid is fundamentally quiet. DC solenoids are often used on rectified AC which may be either full wave or smooth half wave. In either cases, the value of capacitor across the DC output will affect the voltage and it is important that the solenoid should be wound for the on-load voltage of the power as a whole.


We manufacture wide range of Nineteen types with specifications established on this leaflet. We also make them as per your specifications and requirements.

The Magnetic system mainly consist of ‘C’ type magnetic frame and “I” or “T” type plunger. Brass guides are provided which guides the plunger and at the same time holds the coil in proper position. The lamination uses are made of high quality silicon steel which does not develop residual magnetism. Specially designed cover brackets facilities the mounting of solenoid in three different positions shown in simplified (adjourning) diagrams.

All such modifications are as:

  • Push rod attached to plunger which protudes through the back frame
  • With spring attachments to the plunger for automatic reverse action
  • With aluminum casting box complete with tie rod, rubber sleeve for dust sealing etc. at extra cost according to the requirements.

While inquiry please furnish the following information.

  • Sealed Pull
  • Pull or Push
  • Length of the stroke
  • Voltage
  • ON and OFF Period
  • No.of operations per hour
  • Rating
  • Mounting position