The ERC series of electromagnets are a double acting push/pull solenoid.
When an electrical connection is made to to coil, the plunger moves through the magnetic field and pushes the shaft along its designated stroke.
Upon removing the electrical connection, the shaft remains in position and is returned with reverse polarity or optional return spring.
Many different standard versions are available (please see catalogue PDF below) and application specific designs can be provided for larger volume requirements.