Linear solenoid RM1

holdingpermanent magnetbistable

Bistable linear solenoid ideally suited for battery operated applications, as its plunger will remain firmly latched by the action of a permanent magnet, keeping the solenoid in a virtual "zero electricity and heating" state as long as required. Specially designed to work in any position as a hold solenoid, where the holding force is supplied by the magnet and the plunger is released by polarity reversal of coil supply. Other ways of application require using the electrical pulse to the coil to generate a pull force. In any case, after unlutching, an external force (usually a spring) is required to return the plunger to its original open position. Typical use as a hold solenoid. Coil is fed by an impulse at nominal voltage (Vn) for at least 50 milliseconds. After de-energising the coil, the plunger will remain indefinitely latched as long as required, due to the action of the permanent magnet having a minimum hold force of 1.2 Kg. To unlatch the plunger, the coil must be fed by an inverted polarity current pulse at the given release voltage. Typical use as a (low energy) pull solenoid. Solenoid is generating a pull force as shown in the force/stroke table. Useful forces will be considerably increased when feeding the coil by multiple values of the nominal voltage, even if in that case the coil duty cycle (ED) must be progressively reduced. Then plunger will remain indefinitely latched, even de-energising the coil, due to the action of the permanent magnet. To unlatch the plunger, the coil must be fed by an inverted polarity current pulse at the given release voltage.