Retainer for door firebreak bitensión. Designed to keep the doors opened firebreak. The action of the equipment is effected on having stopped applying 24V. Force of retention of 60Kg/600N. Possibility of supply to 12V or 24V. Consumptions: 170mA to 12V / 85mA to 24V. Equipped with plate ferromagnética articulated. Supplied with box, push-button of unfreezing and arm of 300 mm.