Square D Electromechanical Relays
Schneider Electric Harmony relays offer universal, miniature, interface and power electromechanical relays from 1 CO to 4 CO contacts, up to 30 A. The electromechanical relays help to reduce the size of enclosures and increase machine reliability. They are available in different contact numbers, current and control coil voltages. The pre-assembled relays offer a compete solution with relay, socket and accessories. The push-in sockets save wiring time and ease maintenance and bus jumpers ease the wiring when multiple EMR Relays are used.
Schneider Electric Square D 8501 Type K relays are general purpose relays that are suited for use as logic elements and power switching output devices. They are designed for multi-pole switching applications at 240 V or lower and have industry standard wiring and pin configurations that allow their use as replacements for many similar relays without wiring or hardware modifications.
More Information about Square D Electromechanical Relays
Schneider Electric Square D 8501 Type R relays are suited for use as logic elements and power switching output devices. Different contact compositions allow these relays to be used in a variety of applications. The short stroke motion of the armature provides long mechanical life required for high speed operation and control systems.
Schneider Electric Square D 8501 Type X relays are heavy-duty, modular relays that are ideal for applications where long life, ease of maintenance and high reliability are important. They Type X relay family offers a complete line of relays and accessories for all control applications.
Relays: Electromechanical vs Solid State
Electromechanical Relays
Electromechanical relays (EMR) use physical moving parts to achieve the desired functionality. These moving parts include the contacts that switch between the normally open and normally closed stationary contacts in the relay. This movement is made possible by an electromagnet. When power is applied to this magnet, it will act on the movable contact causing the relay to switch. In an EMR, it is common to hear the switching sound that is represented as a “clicking” noise. This audible noise can be helpful when determining the functionality of the relay.
Solid State Relays
Solid state relays (SSR) use a low power, electrical signal to generate an optical semiconductor signal that will transmit and energize an output signal. When this is activated, the input optical signal will act as the switch, allowing a higher voltage signal to pass through the relays output components. The internal circuitry of a SSR is far more complex than an EMR, but there are no physical moving parts.